GMS .76 compression....
 

I feel the engine turning over way too easy. If you see the video below, I know you don't really know the amount of force im using to turn it over but half way through the video you can see me close the carb completely and still turn it with one finger. Does that seem like too little compression? My OS .46 is harder to turn than that.

I did find this though:

ATTENTION
When you use low nitro fuel, sometimes, if you start the engine by hand, you will feel it's quite hard to flip over the propeller; it's possible that the compression ratio is too high. If so, please add one or two pieces of cylinder gasket. On the contrary, if the engine can be started very easy but RPM is not high enough, it's possible that the compression ratio is too low. If so, please take out one or two pieces of cylinder gasket.

Should I remove the gaskets ?

BTW, This is a NIB engine and I did check all bolts for tightness along with the glow plug... I have yet to introduce fuel into the motor.

Thanks

Video Link:

Click here to watch 76-compression

RE: GMS .76 compression....
 

Vendetta

This is not an ABC set up.

The GMS .76 has a dykes ring. It will feel like there is no compression when turned over by hand. Compression is acheived by the force of combustion gasses "pushing" the ring against the liner wall.

Run the engine, break it in as per the instructions, and see if it performs to spec. It is almost certain that you should have little to worry about

RE: GMS .76 compression....
 

The GMS .76 is a ringed engine, I don't believe it's going to produce much compression until you put a few tanks through it and give the ring a chance to seat properly. It will take a lot longer for you to break in in turning it by hand like that! :D

Hopefully a couple of the experts here can verify my opinion...

RE: GMS .76 compression....
 

Ahh that makes sense guys !! Thanks for your input....