Ofna buggy will not start. Please help.

[OfnaHyper]

Hey there guys.

I have a Ofna 1/8 off road buggyn fitted with a hyper .21 engine and rotostart. I have recently replaced the piston and liner because a hole was found in the side ov the piston near the pin. Anyway after doing all this I cannot get it to fire again. When I try and start it I do the normal (blowing down the pipe) and what not. Using my rotostart I try and start it but nothing happens.

I have noticed that when you apply a small amount of throttle when turning it over all of the fuel returns back into the tank and leaves the fuel pipe empty. Why would it do this?

I am yet to try heating the engine with a hair dryer or something. Would putting a small amount of fuel in the head work?

Any help or advice much appreciated.
Thanks Phil.

 

[speedingbulletbp]

low compression maybe? did you seal the engine after replacing the piston and everything else?

 

[Scrogg]

Double check that you did not put the piston in backwards. Also anytime an engine has a issue internally such as yours, replace the bearings....Cannot stress the importance of this. So many people replace pistons and sleeves, have them repinched when all they needed was a set of bearings...Anyways you obviously needed a new piston and sleeve.
Definitely preheat the engine. The piston and sleeve have not worn into each creating the seal that sucks the fuel into the engine. Always preheat a new engine or fresh rebuild before starting for the first 10 tanks. The engine will run better, start easier and last 10X longer if tuned properly.