RE: RCAero JC Engines & YDA Engines

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RE: RCAero JC Engines & YDA Engines - 10/30/2012 7:11 PM

jasburrito

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my jc evo 30 runs mint. gusting 30
http://www.youtube.com/watch?v=BhfhpNWviqo&feature=share&list=UUwPjgJtWYlgfZDzY6uWToVg
1500 to 7400 vess 19b. 10 pound 540.
But ya I think there is pooling too.
Over 40 flights and never had a dead stick. After some rolls and knifes the fatness is way less.
Runs as good or better than any gassers at my field! I would not buy another just because of the choke setup.think mintor has the same. I stole some parts off a diff carb to make right.

< Message edited by jasburrito -- 10/30/2012 8:59 PM >

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RE: RCAero JC Engines & YDA Engines - 11/8/2012 10:55 PM

Michel

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Hi

Got in contact with JC engines ,......................... our 28cc is worth paperweght . And,................ they want $250 ( shipping ncluded ) for a 30cc .

I find this very very funny . Because there 30cc doen,t match up to the DLE 30

Hello DLE 30 , good bye JC

Michel

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RE: RCAero JC Engines & YDA Engines - 11/9/2012 7:22 AM

R/C Addiction

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michel gravelle,
You and I must be on a parallel mental universe!!

I figured, why not contact JC engines and give it a try...see what they will do...what is the worst they could tell me? I was told that for the small sum of $200 dollars plus shipping they would provide me with a new JC 30cc....and as a bonus I would get to keep my JC 28!!! "The reason we did like this is we want you to continue enjoy the JC engines!" In their defense...my engine was surely out of warranty....but a known and well documented defective product is still just that....live and continue to learn...I will eventually replace it with a DLE 30...

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RE: RCAero JC Engines & YDA Engines - 11/9/2012 11:27 AM

Michel

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Hi

Word for word ,............................... thats exactly what I got . Great support , like a cement mattress . I will never speak well of JC .

The least they could of done , is help us repair the 28 , and tell us whats wrong .

It,s just a hobby ,.......................... let it go .

Michel

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RE: RCAero JC Engines & YDA Engines - 1/7/2013 10:59 AM

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Well, my JC 28cc died today and not from a crash or neglect. It probably had about 3 gallons through it which isn't much time for a gasoline engine. I was flying along with it in my Mud Duck when the engine just slowed down and quit for no apparent reason. The engine still turns over fine but it wouldn't start or even fire. I am guessing that the ignition crapped out but I haven't done any trouble shooting. I am done with this engine and JC in general. I have had enough with trying to get this thing to run right. I now have a good door stop and conversation piece for anyone that asks.

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RE: RCAero JC Engines & YDA Engines - 1/7/2013 2:24 PM

RCplanman

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RC, If I might askhow is the compression when you turn it over?Thanks,Bill

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RE: RCAero JC Engines & YDA Engines - 1/7/2013 2:36 PM

RCplanman

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Jas, I'm a little late on reading this bt wondered could/would you take a photo of your carb/chock set-up on your
-JC 28? Thanks, Bill

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RE: RCAero JC Engines & YDA Engines - 1/7/2013 3:20 PM

labor7

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Hi, I think I read almost all pages from this thread and did several searches too, to find a solution for the "tilt and die" Issue.
But it seems there is no real solution that can fix it 100% so far or did I overlook something?
So I did some investigation and found a really simple solution. I think it's worth to try it in case you are experiencing this kind of problem. Click
Just turn the carburetor 180° that the metering diaphragm is in upright position. It seems it doesn't like the downward/ hanging position due to gravity reasons. (keep in mind you have to re adjust the carb.)
It fixed the problem completely on my engine.

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RE: RCAero JC Engines & YDA Engines - 1/7/2013 10:23 PM

Michel

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quote:

ORIGINAL: R/C Addiction

Well, my JC 28cc died today and not from a crash or neglect. It probably had about 3 gallons through it which isn't much time for a gasoline engine. I was flying along with it in my Mud Duck when the engine just slowed down and quit for no apparent reason. The engine still turns over fine but it wouldn't start or even fire. I am guessing that the ignition crapped out but I haven't done any trouble shooting. I am done with this engine and JC in general. I have had enough with trying to get this thing to run right. I now have a good door stop and conversation piece for anyone that asks.

Hi

Youre not the only one buddy ,.................. they make great paper weights . JC can go to a place , " FAR FAR AWAY "|

Michel

And lets not forget YDA ,....................... PURE GARBAGE

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RE: RCAero JC Engines & YDA Engines - 1/8/2013 10:01 AM

R/C Addiction

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quote:

RC, If I might ask how is the compression when you turn it over?Thanks,Bill

Bill, the compression seemed normal for this particular engine. Even after it died. Let me explain...as I have noticed variable compression with this engine. Sometimes the engine felt like it had very little compression (to almost none) and other times it seemed to be better, but it has never had the compression of my other gas engines (SPE 43, RCGF 15, RCGF 20, RCGF 26 and JBA 15). It seemed to run pretty good at 1/3 throttle and above regardless of the observed compression so I didn't really pay much attention. The engine would set for a few months while I was at work overseas and when I returned and ran the engine the compression seemed to increase a bit but never approached the compression of my other engines. Curious as to why you asked? Do you think the compression has anything to do with the issues I/others experienced?
Jeff

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RE: RCAero JC Engines & YDA Engines - 1/8/2013 11:31 AM

RCplanman

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Hi Jeff, I asked because I've never had a gas engin die.I've used ZENEAH for 30 yrs w/out a problem...except they do have the carb hanging out the side,...and that's a problemon the newer models.. Bill

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RE: RCAero JC Engines & YDA Engines - 1/9/2013 2:23 AM

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Well I was bored today without a whole lot to do and I am a naturally curious person so I set out to find out why my JC 28cc died on my last flight. I changed out the ignition battery, bypassed the electronic ignition cut off switch..all the routine troubleshooting stuff but it still wouldn't start. I also had a good spark with every rotation of the crankshaft. I had no idea what was wrong. So I removed the engine thinking it had to be the carburetor. When I removed the carb the issue became clear as day...one of the thin metal reeds had fractured and was ingested into the engine...nice! As you can see by the pictures the engine is pretty much ruined...no big loss. In my quest to see if I could get this thing to run right I had purchased a reed block for an XYZ 26cc (I believe) listening to someone on RCU who said they were interchangeable and decided to see if it would run again. I removed the jug and flushed out the whole engine of all the small metal pieces and bits and reassembled it. I will have to wait 24 hours for the gasket material to cure and I will try to see what it does. Will report back in a day or so when I get a chance to try and start it. What is the worst that could happen? Maybe the alternative reed design will make a difference with the tilt and die issue.

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RE: RCAero JC Engines & YDA Engines - 1/9/2013 3:57 AM

JVB

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That'll do it. Very interesting. I have two of these and they run great. Did have to replace the front housing on one as the bearing was spinning in it. However, I couldn't ask for easier starting and better running engines.

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RE: RCAero JC Engines & YDA Engines - 1/9/2013 4:19 PM

R/C Addiction

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It started up but only with the help of an electric starter. I can't hand start it anymore. As expected the compression is almost non-existent now. I got the engine tuned and it is putting out 6600 RPM with an 18X8 prop. Not too bad considering all of the carnage inside. It runs surprisingly well considering all the issues it has. I leaned out the low end as much as possible while still maintaining a decent transition. The tilt and slow down/die issue is still present so its not the reeds (tried two additional reed sets as well as the stock ones and replaced the stock carb with a DLE 30 carb). I do believe that I have tried everything within my abilities to remedy the tilt and slow down/die issue so the issue has to be inherent in the design. This will fly my Mud Duck MK II until I get a chance to replace it with a DLE 30.

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RE: RCAero JC Engines & YDA Engines - 1/9/2013 4:33 PM

BadAzzMaxx

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quote:

ORIGINAL: R/C Addiction

It started up but only with the help of an electric starter. I can't hand start it anymore. As expected the compression is almost non-existent now. I got the engine tuned and it is putting out 6600 RPM with an 18X8 prop. Not too bad considering all of the carnage inside. It runs surprisingly well considering all the issues it has. I leaned out the low end as much as possible while still maintaining a decent transition. The tilt and slow down/die issue is still present so its not the reeds (tried two additional reed sets as well as the stock ones and replaced the stock carb with a DLE 30 carb). I do believe that I have tried everything within my abilities to remedy the tilt and slow down/die issue so the issue has to be inherent in the design. This will fly my Mud Duck MK II until I get a chance to replace it with a DLE 30.

Email me your shipping address and I will sent you some parts that I think will solve your problems.

Just pay pal me the shipping cost when you receive the parts

Milton

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RE: RCAero JC Engines & YDA Engines - 1/9/2013 4:38 PM

R/C Addiction

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E-Mail sent. Thank you Milton.

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RE: RCAero JC Engines & YDA Engines - 1/9/2013 4:43 PM

BadAzzMaxx

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Will get them out to you today.

The tilt and die is fuel puddling problem in the reed case, The reed I send you will have a plastic wedge in one part of it that will not let the fuel puddle.

Milton

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RE: RCAero JC Engines & YDA Engines - 1/9/2013 4:45 PM

R/C Addiction

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I will give em a try and report back.
Thank you for the parts...
Jeff

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RE: RCAero JC Engines & YDA Engines - 1/10/2013 1:31 AM

labor7

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quote:

ORIGINAL: R/C Addiction

The tilt and slow down/die issue is still present so its not the reeds (tried two additional reed sets as well as the stock ones and replaced the stock carb with a DLE 30 carb). I do believe that I have tried everything within my abilities to remedy the tilt and slow down/die issue so the issue has to be inherent in the design.

Hi, seriusly read my comment above. By rotating the carb 180° and mount it this way (you need to modify the pump tubing from the crank case to the carb)
Look at the design on other brands like DLE, DLA etc. they all have the carb mounted the way I mentioned. Also the first DA 50 had this problem with the first series and guess what they changed later: They rotated the carb 180°.
:-) Different reed blocks were tested many times but only improved a little bit but never fixed it completely. I don't believe this theory because the symptoms are also there immediately after you come from high RPM's down to idle. There is no change for fuel pools in this short amount of time.

Andy

< Message edited by labor7 -- 1/10/2013 2:01 AM >

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RE: RCAero JC Engines & YDA Engines - 1/10/2013 2:20 AM

R/C Addiction

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Andy,
If all else fails I will give that a try. It will involve having to relocate the throttle pushrod which would be a pain but it is an option. Thanks for the tip.
Jeff

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RE: RCAero JC Engines & YDA Engines - 1/10/2013 9:35 AM

labor7

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Andy,
If all else fails I will give that a try. It will involve having to relocate the throttle pushrod which would be a pain but it is an option. Thanks for the tip.
Jeff

Just do a dry test w/o changing the linkage and see if it helps. That’s the way how I did it. Just play with the throttle directly on the carb. I put a little set screw in, to adjust the RPM, you can't use the original screw any more with the Carb turned 180° around because it hits one of the engine stand offs.

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RE: RCAero JC Engines & YDA Engines - 1/12/2013 7:45 PM

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So Milton sent me some parts to fix my engine and they arrived today. Thanks again Milton! You know you didn't have to do that. So a bit later today I am going to replace the damaged parts with the parts that Milton sent me. He also provided a reed valve assembly with a spacer/wedge that should solve the tilt and slow down/die issue. I will take pictures and post them as I progress.

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RE: RCAero JC Engines & YDA Engines - 1/12/2013 8:24 PM

R/C Addiction

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Milton,
I just received the parts that you sent. Thanks again for doing that. I also sent $7.00 to your e-mail address via Pay Pal to cover the money for shipping. One question though…the wedge for the reed valve assembly…should the reed block be mounted as per the stock configuration (pulse line fitting mounted with the fitting at the bottom of the engine) or toward the top of the engine? I have my engine mounted with the jug upright in the airplane. I was just thinking that the wedge might need to be mounted at the bottom, in my case, if it’s really a fuel pooling issue causing the problems (which would mandate mounting the reed valve assembly with the pulse line fitting pointed up because the wedge and the fitting are at opposite ends of the reed block.)

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RE: RCAero JC Engines & YDA Engines - 1/12/2013 11:20 PM

BadAzzMaxx

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Email sent.

Milton

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RE: RCAero JC Engines & YDA Engines - 1/13/2013 12:48 AM

labor7

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quote:

ORIGINAL: R/C Addiction

Milton,
I just received the parts that you sent. Thanks again for doing that. I also sent $7.00 to your e-mail address via Pay Pal to cover the money for shipping. One question though…the wedge for the reed valve assembly…should the reed block be mounted as per the stock configuration (pulse line fitting mounted with the fitting at the bottom of the engine) or toward the top of the engine? I have my engine mounted with the jug upright in the airplane. I was just thinking that the wedge might need to be mounted at the bottom, in my case, if it’s really a fuel pooling issue causing the problems (which would mandate mounting the reed valve assembly with the pulse line fitting pointed up because the wedge and the fitting are at opposite ends of the reed block.)

Jeff, can you take a photo please, I'm just curious to see the new design.

@Milton, is the new reed block an original part from JC engines or second source (which is maybe better than original)?

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