woosh

My Feedback: (1)

I just can't get my engine to run right after I crashed a couple weeks ago. My Raptor 50 went in hard and broke the servo horn on the throttle causeing the throttle to go to max. By the time I got to the heli it had run out of fuel. I have checked everything I could think of but I can only get the engine to run when the low speed needle is set to about 1/4 turn out and the high speed needle out about 3/4 of a turn. I get the heli in the air and after about 45 seconds it starts to loose power telling me that my mixture is to lean. I turn the needls to where I think they should be ( out about 1/2 to 5/8 on the low speed and 1 1/2 to 2 on the high speed and it starts and idles fine but at about 1/4 throttle it starts to spit and sputter and will probably die. Sometimes if I puch the throttle up it will get through that rough area ( about 1/4 to just below 1/2 throttle and it will hover and run great at just above 1/2 throttle until it starts to lean out and loose power. Could I have damaged my engine when it continued to run at full throttle after I crashed? I'm lost.

BarracudaHockey

My Feedback: (11)

Pull your tank and check (or replace) the clunk lines and make sure its bobbing freely. Check or replace all your fuel and pressure lines and make sure you have a good, leak free fit between your engine and muffler.

Check and tighten all the head bolts and backplate bolts. Check the carb to case seal, make sure nothing got broken there as well.

To answer your question, yes you could have caused damage by fuel starving at full throttle but you would probably get away with it once. If your unsure, pull the muffler and look at the piston for discoloration or scoring. If it looks ugly pull the head and see what the top of the piston looks like.

woosh

My Feedback: (1)

Thanks, I won't get to it until next week. I hope it's nothing serious.

woosh

My Feedback: (1)

I think I found my problem, I took everything apart and found that I cracked the engine block around the mounting holes for the muffler, also the mounting flange for the muffler is not flat.

BarracudaHockey

My Feedback: (11)

That would do it.

woosh

My Feedback: (1)

do I dare build some kind of a jig to grind the flange flat, or should I just buy a new block or engine? The cracks do not go all the way to the exhaust outlet. Also when I pulled the engine head there was a little dark spot on the piston around the edge, it's not a burn hole. Is this ok? I never took apart my engine before, do I need to assemble it with a new head gasket or can I re-use the old one?