RebarDWG

Hi all,

I have a raptor 50 with a 50Pro engine. It has started manytimes for me before. But now, i cant

get it to start.

When i crank it with out the glow ignitor, i can see that there's no fuel going into the engine. I

cant flood the engine if i tried. BUT, if i take my finger and plug the exhause, then crank, I can

see the fuel go into the engine. Ok now with fuel in the engine, it will start for 1 second, then

die. The results are the same everytime i do it.

Here's what i have done so far:

changed the piston, piston ring and cylinder
changed the entire fuel line (even the line inside the main gas tank)
I have cleand the fuel filter
I am sure the glow plug is ok and screwed on tight (cuz it will fire up if i plug the exhaust.)
I have set both needles to manufacturer's default settings.
I have even taken off the reserve 2oz tank and connected the main gas tank directly to the engine.
There is no "junk" in the engine, i cleaned it when i replaced the piston, piston ring, and

cylinder.
All my fuel lines and muffler line are secured tight. I zip tied them to make sure they dont work

themselves loose.
The muffler has no holes in it.
I replaced the gasket between the muffler and engine.

Here's what happened that lead up to this problem.

I was hovering my heli, the 2 screws that hold the muffler to the engine worked itself loose. The

muffler almost fell off in flight. There was alot of smoke coming from the engine. I landed the heli and the engine died on its on (overheat? or no compression?). It never started up again after that.

Why is there no pressure to feed my engine with gas? I've never hear of a muffler going bad. What is the next step?

Please help.. thanks.

Chi

Prophex

euhm, is the muffler still on it, when it won't start ?

RebarDWG

yes, the muffler is mounted.

ole.steen

The next step is to dismantle and clean the carb, it seems to be the only relevant thing you have not tried yet.

Andrew_S

My Feedback: (12)

U could try blowing thru the feed line while it is hooked to the carb, chances are the low end needle is in too far...

planelazy

as stated before try opening the low end needle[counterclockwise] a little. I had this problem with a new ,never started Thunder Tiger 50. As soon as i opened it you could see the fuel drawing in. Tim.

aperacing

I had the same thing on a car engine it ended up being the back cover gasket. If thier is a leak in the crank case you will lose the vacuum to the carb. When you block off the muffler you are pressurizing the fuel tank and just pushing the fuel in.