RE: Omitting An Oil Seal?
Thanks W8ye, I take your point. Thanks for the info (again).
Posted on: 10/15/2010 10:50 AM by Author "efish" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10070190

RE: Omitting An Oil Seal?
Hi Milton, guess you have a point - I have a G-62 that just keeps ticking away and I've never even thought to open it up to take a look! Chinese engines are a different matter for me - their low prices just means that I can afford to test a few and try to understand and sometimes improve on what's going on. I think they're great to tinker with and very affordable for learning purposes. The engine in question is a CRRC Pro GP50R. It's a lot like a DL50 - same piston, jug, crankshaft etc but with a much nicer machined crankcase with different bearings and a separate oil seal. I actually found that while power output was very similar, the GP50R seemed (to me) to have a little less vibration. My DL50 starts easily and runs good as well, but shakes a little too much for my liking. Mind you, my CRRC engine came with a sensor that had to be reworked (it was too recessed in its housing to pick up the magnet) and re-timed (advanced the timing a little) to get it to work properly. Only took a few minutes, but it was a little worrying when it wouldn't pop out of the box. Funny thing - the original GP26 with a cloned Zenoah head also had a separate seal, but the latest versions have done away with this and gone with a DL like arrangement. Haven't tried it yet, but I just might soon since the the original GP26R has worked very well for me indeed.
Posted on: 10/15/2010 10:31 AM by Author "efish" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10070156

RE: Omitting An Oil Seal?
Thanks W8ye! Do I understand you to mean that the Ultra Seal bearings provide a better seal as opposed to normal rubber sealed bearings? If so, does that mean that if I can find Ultra Seal bearings of the correct size, then I could happily omit the oil seal? After further thought, I'm not sure if its going to be wirth the bother since if I were honest, the engine has been running really well! Just took it apart to see how things looked internally; curiosity and an urge to make things better prompted this thread. On the other hand, if it ain't broke.... Thanks.
Posted on: 10/15/2010 9:32 AM by Author "efish" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10070054

RE: Omitting An Oil Seal?
OK guys, thanks. Guess I'll leave it in place then. Was just wondering beacuse I haven't seen one in a nitro engine and there are quite a few gas engines that do without one as well (including the DLEs).
Posted on: 10/14/2010 11:31 PM by Author "efish" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10069531

Omitting An Oil Seal?
Hi, I have a Chinese made 50cc engine based around the DL50. I notice that it has a separate oil seal unit on the crankshaft between the bearings, while my DL50 doesn't. Would it be a good idea to remove the oil seal (less friction?) and just use a quality front rubber sealed bearing (perhaps with the rear seal removed)? The stock front bearing does already have a rubber seal so I'm not quite certain what the separate oil seal is intended to do. Thanks!
Posted on: 10/14/2010 1:01 AM by Author "efish" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10067505

RE: 6108SB Receiver and The S Bus System
Thanks Bax, having gone through most of the materials available, that was my understanding of the sbus system. I guess that would work perfectly for the purposes as described in my original post.... One further query - in order to get my optical kill switch to work on my 6014 receiver, I had to install a signal amplifier (due as I understand it, to the lower signal voltage this receiver puts out) Do the new 6108sb receivers work with a similar signal voltage? Thanks.
Posted on: 8/31/2010 9:03 PM by Author "efish" in the forum "Futaba Radios Direct support forum"
http://www.rcuniverse.com/forum/fb.asp?m=9972771

RE: 6108SB Receiver and The S Bus System
Thanks Exeter that was exactly what I meant. Bax, do I understand you to mean that the 8 channel receiver will only support 8 channels even if run on the sbus system?
Posted on: 8/29/2010 3:38 AM by Author "efish" in the forum "Futaba Radios Direct support forum"
http://www.rcuniverse.com/forum/fb.asp?m=9966564

6108SB Receiver and The S Bus System
Hi, I'm thinking of trying out the sbus system on my 12 FG. I have a question - Would it be possible to operate servos on both the "normal" servo pins as well as the SBus system? For e.g. I have a plane that is currently setup on a 6014HS using 10 channels. Would it be possible to use non-sbus servos on the regular pin outlets for 8 channels and then hook up a SBD-1 decoder to run the other 2 servos via the SBus connector? If so, this would be a very attractive and cost effective way of progressively getting my places onto the SBus/Futaba system. (I'm not completely converted to FASST yet) Thanks.
Posted on: 8/26/2010 11:45 PM by Author "efish" in the forum "Futaba Radios Direct support forum"
http://www.rcuniverse.com/forum/fb.asp?m=9962619

Optical Kill Switch On 12FG
Hi, after years as a JR/Spektrum user, I recently changed to a 12FG radio. I'm setting up one of my gas planes with the radio and things have gone remarkably easily except that I cannot setup my RCEXL optical kill switch to work with the new radio. I'm running firmware 2.0 and the plane has a 6014FS receiver installed. I have plugged the optical kill switch onto channel 10 and given it 140% of travel in both directions. Checked it in the servo monitor and it does indeed swing 140% each way as I flip the switch. The problem is I cannot get the switch to respond at all. The switch works fine on a spektrum or FM receiver. Just not on the 12FG/6014FS. It seems really weird to be grounded by such a trivial problem. Please help.
Posted on: 7/29/2010 6:51 AM by Author "efish" in the forum "Futaba Radios Direct support forum"
http://www.rcuniverse.com/forum/fb.asp?m=9896070

RE: Can the Aurora 9....
Hi Mike, that's useful info too... Perhaps I am looking a little too closely at these things and just need to lighten up and fly more! Thanks again.
Posted on: 7/8/2010 2:53 AM by Author "efish" in the forum "Hitec/MultiPlex Radios- Ask Hitec Customer Service"
http://www.rcuniverse.com/forum/fb.asp?m=9851565

RE: Can the Aurora 9....
Thanks Tom. I actually read those instructions on that other forum some time ago. They're great and yes, I've been doing just that in accordance with basic setup principles (linkages mechanically correct, minimise subtrim and EPA variance). No problems with centering or end points. There's absolutely no humming with either servo. My first issue was that my current transmitter doesn't support trimming or the onboard mixes on both ailerons when running this 4 servo configuration. I'm guessing the A9 does. The second issue is a little more subtle and not unique to the ailerons. I notice with my dual servo elevator setups, the 2 elevator halves are sometimes just a hair out of sync in certain parts of the travel. The center and end-points are perfect. Mechanically, they're setup identicall and sub trim is minimal or zero. Just wondering if the new (?) servo sync/servo group feature will solve this. Thanks.
Posted on: 7/8/2010 12:20 AM by Author "efish" in the forum "Hitec/MultiPlex Radios- Ask Hitec Customer Service"
http://www.rcuniverse.com/forum/fb.asp?m=9851420

RE: Can the Aurora 9....
Thanks so much Alan for the quick, detailed and informative response. On the first issue, my current transmitter can do quad flaps and 4 independent aileron servo (as on a bipe) without too much of a problem. Evenprogrammed in a crow mix on a quad flap 3D plane once and that was very fun. I was very surprised that it just couldn't do the 2 servo per aileron setup as well. Not sure how the A9 would work with 2 servos pulling on 1 surface your p-mix example is one way. But I guess I'll have to try it out and see what happens. On the second issue, do I understand you to say that the P-mix setup in effect works as well as the servo sync/servo group functions? Or alternatively that the servo sync/servo group functions do not add anythign to the traditional p-mixes? I've setup many such p-mixes on my current transmitter (without the servo sync/servo group function) before, and while they do get the job done, its not quite completely synchronised for some reason (and yes, the mechanical setups are identical). I only use digital servos for these applciations. Thank you again.
Posted on: 7/7/2010 11:28 PM by Author "efish" in the forum "Hitec/MultiPlex Radios- Ask Hitec Customer Service"
http://www.rcuniverse.com/forum/fb.asp?m=9851299

Can the Aurora 9....
Hi, I'm thinking of upgrading my current transmitter because of the programming limitations. A fellow flyer has an A9 and suggested I consider trying one out. There are 2 issues I need some clarification on:- #1 One of my planes has 4 aileron servos (2 aileron servos per wing) I can get this to work on my current transmitter with some convoluted mixing, but I lose the trim in one wing plus the onboard programming for e.g. rudder to aileron mix. Can the A9 support such a setup? #2 Servo sync/servo grouping. I'm not sure if the A9 has an equivalent feature, but the idea is to be able to do away with either a servo programmer or a matchbox on surfaces which use more than 1 servo (e.g. dual servo elevators) Again, I can work around this with my current transmitter, but I can notice when the travel of the servos are not fully synchronised throughout the movement (and not just at centre/end points). Thank you.
Posted on: 7/7/2010 10:40 PM by Author "efish" in the forum "Hitec/MultiPlex Radios- Ask Hitec Customer Service"
http://www.rcuniverse.com/forum/fb.asp?m=9851198

MVVS 3204 Cannister w/ non-MVVS Engines
Hi, I was wondering if anyone has had any experience or views on using the MVVS 3204 canister with non MVVS engines e.g. the DA50 In particular, I’d be interested in:- 1. The header length used for optimum results; and 2. The performance with the canister. Thank you!
Posted on: 6/11/2010 5:13 AM by Author "efish" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=9795748

RE: MLD-28 gasoline engine
Hi guys, I tried one flight with the stuffed muffler today. The good news - as 96td indicated, the engine noise is much reduced. Best part is I did not even notice the loss of rpms. So after about 5 mins of flying time, I decided that this was definitely the way to go! The bad news - after a further 3 mins and a little more brief hovering/torque rolls (with lots of low throttle cooling off time in between), the engine started to sag. Not bad, but definitely discernible. Pushed the stick over and made a quick landing. Engine seems fine. I had the engine slightly rich and was running with the cowl off. Had done a number of similar flight profiles using the unstuffed muffler with no problems. I'm not saying it couldn't be something else, but perhaps the same thing that traps the sound energy also traps the heat energy and the reduced rate of heat transfer makes the engine prone to overheating. Does that sound reasonable? Would be keen to hear any suggestions because I do prefer the dull, muted tone of the stuffed muffler. Thanks.
Posted on: 5/19/2009 11:10 PM by Author "efish" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8783413

RE: MLD-28 gasoline engine
Hi guys, just in case someone is interested, I tried the mld with a full ball of stuffing in the stock muffler. I was very surprised to see that there was no further loss of rpm (as compared to 1/2 a ball) - its about 350-400 rpm below the unstuffed muffler. There is, however, a readily discernible difference in the noise! It sounds more .... well, muffled. The difference is most pronounced in the low/mid throttle range where it has a dull purr almost like a four stroke nitro engine! Not sure if I'll fly with or without the stuffing, but its a nice trick to have up the sleeve when visiting other fields. Thanks again 96td for sharing a great idea. Blue77, I'm no expert, but I've found these gas engines to be exceptionally hardy. Had a brillelli 25GT that was shot down a couple of years ago and it hit hard enough to break one of the mounting lugs. Emailed Scott and he said the engine should still run fine - he was right! My expereince with these chinese engines has been that problems are more likely with the EI system - had an EI fail inexplicably on an SPE previously (same factory/EI as MLD) and the EI has proven to be the archilles heel for me on a number of other chinese makes. You indicated no spark - if this was with the plug out, then I'm guessing that there's a problem with the EI/plug. I would suggest borrowing another EI to test before shipping the engine out.
Posted on: 5/18/2009 11:53 PM by Author "efish" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8780623

RE: MLD-28 gasoline engine
Hi guys, thanks. Seems a few posts crossed mine. 96 td - thanks. I know the rpm drop is slight, but since there are no noise considerations for me, I can't really justuify losing the power on a 3D fun fly plane. leepord gecko - yep these walbro carbs do have a rather odd throttle curve. I normally set up a custom throttle curve on my gassers once the engine is broken in - nothing fancy, just a linear rpm response for each position of the throttle stick. I like Menz props, but... well, I would sheepishly concede that I'm now flying a Hawk prop. Why? dirt cheap cost plus rough field plus low ground clearance.... Haven't broken any prop on this setup yet, but its one thing less to woirry about! Jimeni, yep, - I had the pitts muffler running on another airframe. Unfortnuately, the current airframe would require a little cutting to fit the pitts muffler which I'm not minder to to.
Posted on: 5/18/2009 12:49 AM by Author "efish" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8777951

RE: MLD-28 gasoline engine
Hi guys, thanks for posting. Jimeni/Ken - Guess I should have clarified - for me, its not quite 3sec as described by leepord gecko. More like under a sec for me. I don't think its a problem with the throttle servo/setup - my first thoughts after I had ruled out receiver failsafe/RF. Played around with the prop, tuning and such and it does vary a very little bit with these factors. The lag is barely perceptible, but its definitely still there. Don't even notice it on the ground. Style of flying also appears to play a part - fly figure 8s and its not noticeable even when goosing the throttle up and down. Certainly, I didn't notice this issue when I flew an MLD powered Stick ( no 3D). Throw in some verticals (loops, cubans, humptys etc) and its sllght. Even more pronounced after hovering and a buncha torque rolls. Frankly, I've just about come to live with it; guess the biggest "inconvenience" is that tail slides don't drop as abruptly as they should :) Engine's not fully broken in yet so I dun do much stalled stuff with it; just wondering if leepord gecko was able to eliminate the problem with a different carb. Wish I had more stalled flying time to fully explore the issue. Actually, I do have a couple of spare carbs laying around, but the engine is doing well, so I'm loathe to mess around with it. Thanks, barracudahockey - was wondering since 96td indicated no loss of power. Noise is not really an issue at the field, but I do notice the difference compared to my nitro 4 strokes and even 2 strokes of similar displacement. Crunched the numbers and 300 rpm is about 8% less static thrust (about 1 lb on my setup). Power is just about acceptable for 3D on the current airframe; mebbe I could do with the 300 rpm drop, but I'm just a little curious at how quiet a 26cc can be. Thanks again.
Posted on: 5/18/2009 12:36 AM by Author "efish" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8777923

RE: MLD-28 gasoline engine
Hi Everyone, just discovered this thread a couple of days back and its been interesting. I'm on my second MLD28 and yes, like most, I think its one of the better Chinese made engines in its class. Anyhow, got a couple of questions that I would be grateful for some guidance on:- 1. 96td - tried stuffing my muffler today. There was a definite reduction in sound, especially in the mid range, but I was definitely losing rpm at WOT. About 400 rpm with the muffler stuffed with about half a ball. Took about a third of the stuffing out and loss was 300 rpm as compared to the unstuffed muffler. 96 td - how much of a ball are you stuffing into the muffler? I'm using the 3M brand pot scrubbers and I guess I could stuff a little more with some tamping, but it seems that the reduced volume does adversely impinge upon the power. Sorry to state the obvious, but with less stuffing comes more noise. 2. Leepord gecko - I'm experiencing the same throttle down lag you described in your earlier post. First time it happened at the top of a humpty bump, I thought the receiver had gone to fail safe! I've now come to expect it, but its still a tad annoying. Did going to the walbro 600 carb fix the problem? Thanks!
Posted on: 5/17/2009 9:48 AM by Author "efish" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8775813

RE: How Reliable Are the 2.4gHz Systems Now?
Thanks Joe... Yeah, I know a few of those guys and they crash regularly even on FM! I've actually become almost paranoid since trying out the 2.4 systems - typically run 2 receiver batts and recharge both between flights. Fortunately, A123 batts have made it possible to be flying with a nearly full pack all the time! For now, they've had a bigger impact on my flying than 2.4 tech. Gotta be safe...
Posted on: 4/23/2009 8:56 PM by Author "efish" in the forum "RC Radios, Transmitters, Receivers, Servos, gyros"
http://www.rcuniverse.com/forum/fb.asp?m=8709994

RE: How Reliable Are the 2.4gHz Systems Now?
Thanks John... Guess I do need some reassurance after the various little eposides I've experienced/witnessed. It was kinda a bad place for me to be last year - the possibility of an unexplained crash or the real probability of getting shot down on FM. (there's little field discipline over here) I've already invested in two major brand 2.4 systems, so I guess it'll be once more into the breach with them.
Posted on: 4/23/2009 12:50 AM by Author "efish" in the forum "RC Radios, Transmitters, Receivers, Servos, gyros"
http://www.rcuniverse.com/forum/fb.asp?m=8707523

RE: How Reliable Are the 2.4gHz Systems Now?
Thanks for the views, guys. I dun mean to bash the 2.4 systems or offend anyone, just want to fly safe. Just to clarify... I too used to think that the FASST was the most secure 2.4 system out there until the recent crashes on my field. Dirty Bird - I had the 400 flights spread across 5 receivers and about 5 air frames, mainly electric and nitro. The gasser had a new receiver/electronics on it and went in on the 10th flight. (The receiver had about 3 "just to be sure" test flights before that on small electric.) The first 9 flights on the gasser were perfect and because the plane was new, it was meticulously checked over mechanically and electronically before and after every short flight. The 10th flight was the first flight of that day and the batt showed a full charge during the pre flight. All controls worked perfectly before and after the crash ... and I'm still flying that same batt and servos on another gasser with no problems. I've experienced FM receiver failure before - on an older receiver after about 1000 hard 3D flights on the same airframe.
Posted on: 4/22/2009 11:51 PM by Author "efish" in the forum "RC Radios, Transmitters, Receivers, Servos, gyros"
http://www.rcuniverse.com/forum/fb.asp?m=8707377

RE: How Reliable Are the 2.4gHz Systems Now?
Alright, thanks guys. Guess the 2.4 systems are pretty dialled in where you are. I waited a while after the 2.4 systems appeared than bought in quite a while back to draw my own conclusions. Over here, the position is perhaps not as clear, hence my original post. I have the most experience with the original XPS system - worked fine most of the time but in the end, cost me 2 planes. All in I probably had over 400 flights in the system; after I lost a new gasser on the 10th flight, I decided that it was too much a safety risk. I'm pretty careful with things like power supply and setup (yes, I do meter the current through servo stall), and despite some very helpful emails from XPS, never did figure out why the planes went in. A friend's heli went in on the older XPS setup too. Apparently, the newer firmware (3.x with ETIS hopping) is a lot more secure and I've not heard of any problems with it. A few of my friends fly Spektrum - main issue is that they do need good voltage, but most crashes I know of were user/battery related, although I do know of one that to date remains unexplained. FASST - well, just earlier this year, 2 FASST equipped planes went in at my field. Both were smallish electric planes with proven setups and a good number of flights on them. Could be the GUID issue. Dealer replaced both transmitters, but as they didn't check the numbers of any of the sets, there's no telling if/when it will happen again. I'm sorry, but the experience of myself and others over here would suggest that there is still room for improvement. I've also lost planes on FM, but in just about every case, I was able to work out why (typically, some fool who "accidentally" turned on his transmitter). 2.4 systems worry me because there seem to be a disproportionate number of inexplicable crashes... I think I'll just have to start my incremental testing (foamies - larger electrics - nitro - gas) all over again!..... Thanks again for sharing.
Posted on: 4/22/2009 12:36 AM by Author "efish" in the forum "RC Radios, Transmitters, Receivers, Servos, gyros"
http://www.rcuniverse.com/forum/fb.asp?m=8704074

How Reliable Are the 2.4gHz Systems Now?
Hi, I was just wondering what is the current wisdom/experience concerning the 2.4 systems. I know they were initially touted as "bullet proof" etc, but the experiences of myself and others have suggested otherwise. I spend a lot less time on this hobby than I used to so I'm trying to manage the risks to my planes. Here's a summary of what I know/understand with the 3 most established systems:- Spektrum: 1. Initial problems - low voltage cutout >4V, apparently now rectificied to 3.5V (happened to a friend's plane) 2. with the 7 channel systems, "only" 2 frequencies in use. (think I saw one lockout because of this) Futaba: 1. Issue with the GUIDs on some models (happened on my field) XPS: 1. original firmware not "hopping", apparently solved in v 3.x onwards 2. apparently sensitive to wires moving near the antenna Point is, I have had or personally witnessed "unexplained" crashes with all 3 systems (and just about every othger one on the market). Doing a google search, I see that others around the world have had similar experiences with each of these systems. I had flown planes with all 3 systems as well as a number of cheap chinese designed/made systems. The scary thing is that all the systems appear to work impeccably on their day - range checks go well and everything is fine and dandy for up to a few hundred flights, then out of the blue, the plane goes into lockout and/or flips itself into the ground. Another observation - by nature, the wide hopping Futaba FASST system appears to be capable of shooting down other 2.4 systems that only look at 2 or 3 frequencies (e.g. Spektrum and some Chinese systems). This happened to me recently during tests on a foamy. Plane had been fine in a number of other fields, then a friend turned on a FASST system with the plane in flight and the receiver went into lockout less than 5 m in front of me. I've also read a credible taiwanese test that suggested that all 2.4 systems are susceptible to lockout in the vincinity of a wireless router. I'm no expert, but I would imagine the Futaba Fasst hopping would have the similar effect as a wireless router. In any event, it would seem that any testing would only be meaningful if performed alongside other 2.4 systems, in particular the Futaba FASST. I understand that, apart from the Futaba FASST system (ironically), its nigh on impossible for 2.4 systems of the same make to shoot each other down. I don't fly much or often these days, so what time I do have is pretty valuable. For safety, I've put all my gassers and larger planes back on FM/PCM.... Seems more reliable and at least I stand a chance of landing the plane if some fool on the same frequency powers on without a frequecy check. Just wondering whether there is an updated/consolidated position. Thanks.
Posted on: 4/20/2009 11:33 PM by Author "efish" in the forum "RC Radios, Transmitters, Receivers, Servos, gyros"
http://www.rcuniverse.com/forum/fb.asp?m=8700655

RE: OS 61RF Engine Rear Bearing Removal
Thanks guys. Darzeelon - thks, good to know, since the cost of a nerw crankcase would likely make this engine beyond salvage. I had already tried the heat-and-smack method with no joy. Bax & Terry, thanks - will try again, this time paying more attention to the alignment of the bearing. Part of the problem is that the rear bearing is in pretty bad shape and even after some anti-freeze cleaning, its still pretty grotty. Rainedave, thanks, the freeze-and heat is my standard bearing installation process though I've found I can often omit the freezing part on many engines!
Posted on: 9/29/2008 12:11 PM by Author "efish" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8001840

OS 61RF Engine Rear Bearing Removal
Hi everyone, I volenteered to help a fellow flier change the bearings on an old OS 61RF. Everything came out pretty normally, except that I can't seem to get the rear bearing out from the crankcase. That is, its not seated anymore, but I just can't get it to fall out of the crankcase. I've tried most of the usual methods - heat etc, but there just does not appear to be enough clearance for the bearing to come out. Took some measurements with my calipers and it seems that there is about a .5mm difference. Is this some pecularity unique to this particular engine? On the otherhand, the engine is old with an unknown and uncertain history. Could it be likely that the rear of the crankcase is distorted thus impeding the passage of the bearing? Would be grateful for any help or suggestions. Thanks!
Posted on: 9/29/2008 4:18 AM by Author "efish" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8000957

RE: Walbro Carb High Speed Circuit?
Hi guys, alright, I swapped out the carb and no surprise, the engine ran perfectly! Re-checked the throttle plate and it seems like I did get it right. So the carb is faulty and/or needs servicing. Pretty sure the high speed circuit is not letting enough fuel in. Does anyone know what's the best way to clear it out? Thanks.
Posted on: 9/20/2008 11:27 AM by Author "efish" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=7972764

RE: Walbro Carb High Speed Circuit?
Hi, sorry I haven't responded sooner, but its a busy month and the weekeends are about the only time I've had to look at this. Many thanks for the suggestions. Pape, actually, I had already eliminated the fuel tank/supply by hooking up another fuel tank I had lying around; I had also stripped down the carb to clean the screen; there was a little debris, but not a spectacular amount (I run 2 filters on that plane). Guess I should have mentioned that in the original post. Coralscape/Jim, perhaps you guys are right. I did have a cursory look before posting, and it did look ok, but I'll take the carb off and reassemble with a little more care. The engine actually useed to turn just past 9000 rpm with that prop so I'm just looking to make up the 1000 rpm or so. Guess I'll give it another go, failing which, I'll put on a spare carb and see what happens.
Posted on: 9/19/2008 11:45 PM by Author "efish" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=7971883

Walbro Carb High Speed Circuit?
Hi guys, need some help with one of my engines. Engine is a CRRC Pro 26I. It had been running and flying absolutely faultlessly; then I laid it up for a couple of months while trying to exit the hobby. Friend of mine from abroad wanted to see the plane/engine in action so I tried to fire it up over the weekend. Engine started fine, runs good at mid to low throttle settings, but dies off once the the throttle is pushed past about 50%. Rpms start to drop before the engine dies off entirely. If I'm quick/lucky enough and get the throttle down, the engine will run fine at less than 1/2 throttle. I've eliminated the spark plug and ignition (by substituiting a new plug and an identical EI unit from another working engine), so I think its the carb. Stripped the carb out, cleaned it in fresh fuel and blew air through it, but the engine is still dying off once I get past 50% of the thottle arm throw (I have a throttle curve set up). There's fuel in the feed line at all times. And I've tried retuning as well... Ignition battery has been checked with a meter, recharged and then replaced as well. At 50% throw, I was getting almost 8000 rpm with the recommended prop; tried a bigger prop to see if there was an issue with EI/rpms, but the same problem exists. So my thought is that there is a problem with the carb, in particular, the high speed circuit. I've tried backing out/screwing in the HSN and the engine pretty much runs the same with the same problem. Would my prognosis seem about right? i.e. there is some occlusion in the high speed circuit. And if so, what would be a good way to clear it off/fix it? Otherwise, I'd be mighty grateful for any other thoughts/sugegstions.... Thanks
Posted on: 9/15/2008 1:13 AM by Author "efish" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=7955300

RE: Non-Metallic Alternatives For Rudder Pull-Pull
Thanks for the info Dave, Taildragger. Guess I'll give the Spectra a go and see what happens!
Posted on: 6/30/2008 11:00 PM by Author "efish" in the forum "Giant Scale Aircraft - General"
http://www.rcuniverse.com/forum/fb.asp?m=7680251