OS 50 Flood Locking or Vapor lock???

[airman01]

so i just built my Vibe 50 and im using my second Hyper...
i finally got it to the stage where i can Break it in and finished one tank...
but when i came back to put a few more tanks thru it, the compression seems to be so strong it wont turn over! even after removing the glow plug and draining the engine (thinking it was Flooded) without starting again it just locks...

now i know the engine is perfectly clean and im pretty familiar with this so im really stumped at how too much compression stopping me from getting it going it seems???

any ideas???

[LAMAR COOLEY]

airman01,
Flood lock or vapro lock?
or ........ CLUTCH LOCK.........
There are two ways " an engine " will lock up. Too much fuel on top of the piston or
too much fuel under the piston or if the engine is damaged in some way.
( piston.cylinder,sleeve,crankshaft,bearing(s) )
Too much fuel on top; remove the glow plug, turn the engine over to expell excess fuel.
Too much fuel under the piston; tilt the engine so the excess fuel is expelled through the
carb. and or the muffler.
If the engine will not turn over with the glow plug removed and assured there is no fuel under the piston.
Then, more than likely the shaft nut has come loose and the clutch-fan assembly has come loose and the clutch is jambed against the top of the clutch bell.
From my experiences I have never had a "vapor" lock. Vapors on top of the piston tend to by-pass the piston and or piston ring or escape through the carb. or muffler if under the piston fairly easy.
I hope this is of some small help.
Regards

[airman01]

Thanks lamar for all that

with that said i think i have too much fuel under the piston!

if i remove the glow plug slightly i can get it turning and its brand new so i know theres nothing wrong/broken with it...

im thinking the factory settings on the Carb are not correct and that its pumping in way too much fuel! when i took it apart last night there was so much raw fuel in my muffler it was dripping out- and i havent even gotten to flying it yet!!!

which valve/needle on the carb do i tighten/loosen to bring the fuel flow down???

thanks once again

[LAMAR COOLEY]

airman01,
From my experience, all the OS heli engines I've ever had have come from the factory with a rich "low end " needle setting. The "low end" IDLE "screw" will be the screw head you see on the carb that requires a small regular flat screw driver to turn it.
If you have the owners manual. Check the diagrams for the exact location. It's the little screw on the right side of the brass plate just above the high end needle valve.
This screw comes from the factory set in the middle of it's total range. This screw can only be turned ( from center) 90 degrees to the right ( clockwise ) or 90 degrees to the left
(counterclockwise ). For a total range fo 180 if set at max. left or right. Currently my low (idle ) screw it set at 45 degrees to right of center. Turning this screw to the right (clockwise) closes (leans) the mixture. Turning to the left (counterclockwise ) opens (richens) the mixture. The hign end leedle valve is the needle you can turn with your fingers. Turning clockwise closes ( leans ), turning counterclockwise ( richens =more fuel ) the mixture ( same as the low end ) If I understand, you will be needing to break in your engine. So start with the high end needle at, let's say 2 turns open from fully closed.
The idle mixture screw is used to give a good idle. Run a few tanks through the engine just hovering. Then slowly, a couple of clicks" at time, start closing the high end needle valve. You will begin to notice the engine running transition from idle to mid and high throttle will begin to smooth out. No spitting, sputtering or hisitation.
Currently my high end needle valve is set at about 1-1/2 turns open from fully closed.
Depending on the weather contitions I may or may not have to open or close the high needle a couple of clicks. Yours may be a little different depending on the fuel used If you notice fuel droplets coming out of the muffler at idle
then close the low screw just a tad at a time until the droplets disappear.
I might also caution about over filling the tank as this is a sure way to flood the engine.
Also as a precaution, with all my helis, after landing and shutting down the engine.
I shut off the fuel line,pick up the heli and tilt it so that excess fuel ( if any ) flows out of the muffler.
All my shoes have fuel stains on them.
I might also recommend checking out http://raptortechnique.com
Lots of good information there.
I hope this is of some small help.
Regards

[Pinecone]

Are you using something to clamp off the fuel line while filling and waiting to start?

If you don't, you can force fuel into the engine while filling, if you use a T filter or fitting. And after you fill the tank, the top of the fuel is higher than the carb, so the fuel with run by gravity into the engine.

[airman01]

wow that was a great break down thanks lamar...

i took a look at my carb and found the low end screw was turned past the center rather rich...im thinking that could have been the reason why i was getting so much fuel in the engine and posibly why it was locking up...

i turned it jus under half way so my idle screw is a little lean...i have also set the high end to a recommendable setting...

i will test the heli out tomor as i finally wont be working!i will let you know how it goes thank you for the tips Lamar!

[airman01]

thanks for your help pinecone...yes i am using a clamp between my fuel tank and carb...i think it was the richness of my low (idle) screw...

thank you