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engine troubles

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Old 04-01-2012, 06:26 AM   #111
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Default Re: engine troubles

i had the same kind of thing before,,level flight ran great,but roll to the left or go inverted it would all but die,flip it back over and runs great,i finally found it had a bad jr connector between the ignition and the hall sensor ,,drove me nuts for a couple weeks



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Old 04-01-2012, 01:10 PM   #112
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Flew the crap out of it today and no problems. Even Buttface approves this message. thanks everybody for all the great info and help.



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Old 04-15-2012, 11:00 AM   #113
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Default Re: engine troubles

got another question. my buddy phil has a da 50r that quit in flight and now wont suck any fuel out of the tank. we checked the fuel lines and all thats good. this engine has about 500 flights on it. i pulled the carb apart and all looks good. diaphram is not busted and the reed valves look ok but i am not to familier with reed valves. any sugestions? also if we pour some fuel in the carb it will run till it runs out. we are going to try a new carb kit and clean the carb up. should we replace the reed valves and block? thanks

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Old 04-15-2012, 11:32 AM   #114
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Default Re: engine troubles

Quote:
Originally Posted by yakken View Post
...should we replace the reed valves and block? thanks
If the reed valves are flexible, not split or warped, and pretty close to closed, they are probably okay. If the engine runs when primed, I would be looking for a delivery problem in the carb. Plugged port, filter or bad pump diaphragm.
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Old 04-15-2012, 11:34 AM   #115
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Quote:
Originally Posted by TManiaci

If the reed valves are flexible, not split or warped, and pretty close to closed, they are probably okay.
I noticed one reed valve was raised slightly.
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Old 04-15-2012, 01:59 PM   #116
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All fixed now. Maybe Phil will come on here and comment on what he found. Lol

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Old 04-15-2012, 02:28 PM   #117
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Default Re: engine troubles

If there isn't a major blockage or a diaphragm issue in the carb, take another look at the fuel lines, especially for:

Tee's or filters between the clunk and the carb. If there are any, get rid of them.

Pinholes in the clunk line, including the metal tube that goes through the stopper. While the tank is open, replace the tubing anyway.

Correct plumbing connections (My son once accidentally connected the fill line to the carb instead of the clunk line. The engine stopped every time the plane was inverted - we don't use dual clunks, just a 90 degree bend on the fill line to the bottom of the tank).

Liquid in the fuel tank (there should be some, it is called fuel) - I have seen this issue before - the guy filled a different plane and had a brain fart.

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Old 04-21-2012, 05:21 AM   #118
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Ok, this is going to be the year for engine problems. my buddy Phil has a da50 that was running perfect until the other day. While flying, it lost the top end of the throttle like it was lean and it just died. It runs fine on the low side. Go above half throttle and it dies. This is what we have tried. Rebuilt carb, new reeds, plug, changed tank and all plumbing. Hard wired ignition. Ran tube off of carb. Doesn't matter what we do it will not run above half throttle. The high side needle doesn't seem to make any difference. The low side you can tune just like normal. I havent had to mess with the ignitions on one of these. Can I check it or what is your guys opinions.

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Old 04-21-2012, 07:13 AM   #119
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Default Re: engine troubles

When you rebuilt the card did you use carb cleaner remove the needles and blow out all the passages?

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Old 04-21-2012, 07:23 AM   #120
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Default Re: engine troubles

Reeds? That or like RTK says the high circuit could be plugged with a small piece of dirt. They can take some doing to remove. High pressure air or a hair sized wire. I had problems with Hayes neoprene clunk tubing filling up my carb screen. That was a beeotch to figure out. Hold your carb screen up to a light and look through it. Mine was plugged with a thin layer of something. Took some work to clean it out. Stuck to it. Now I only use Viton for clunk line.



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