Piston stuck at TDC

[sonic883]

I broke my piston rings the other day, and the news arrived just this morning. I put them on correctly, slid on the cylinder, the piston gets stuck at tdc. it’s so weird, if i loosen the top head bolts, it works fine, as soon as I add compression it just gets stuck. When it gets stuck if I keep trying to move it it won’t go at all, if I roll the bike back and push it with some momentum, it the piston moves up and down really quickly. But still with a clinging noise.

I have a 2 stroke 80cc engine.

 

[Chainlube]

I broke my piston rings the other day, and the news arrived just this morning. I put them on correctly, slid on the cylinder, the piston gets stuck at tdc. it’s so weird, if i loosen the top head bolts, it works fine, as soon as I add compression it just gets stuck. When it gets stuck if I keep trying to move it it won’t go at all, if I roll the bike back and push it with some momentum, it the piston moves up and down really quickly. But still with a clinging noise.

I have a 2 stroke 80cc engine.

You got a low hole piston on a high hole rod.

 

[sonic883]

You got a low hole piston on a high hole rod.

what does that mean ? please explain further

 

[Member 30571]

It sounds like the piston is hitting the head ? .

 

[sonic883]

i think the pistons hitting the head, theres nothing obstructing the cylinder or anything. it has to be hitting the head

 

[Member 30571]

Silly question... Did you put the base gasket & head gasket back on ?.

 

[sonic883]

Silly question... Did you put the base gasket & head gasket back on ?.

my head gasket yes, but before i noticed the base gasket id kind of broken, so i made some more out of cardboard to lift the cylinder up, but im getting the same result.... the piston wont move past TDC.

 

[Member 30571]

OK, 1 last try at guessing what went wrong...... Is the cardboard gasket the same thickness as the original gasket ?.

 

[sonic883]

no matter how much i lift it, it seems be stuck at TDC.

 

[Karl Snarl]

no matter how much i lift it, it seems be stuck at TDC.

You can use cereal/pop box and rtv to make your own stack of gaskets. Make it as high as ya want or need. Only limit is your ability to empty a box and use a pen and scissors.