No compression

[Mwhit91]

Hey I have a question, my boyfriend is working a dirt bike the previous owner of it sunk it in the mud. The carburetor has been cleaned, we just put a new piston an ring's in. But for some reason it will not crank an acts like it doesnt have any compression. Can anyone give me some ideas on what it could be.

 

[jaguar]

no compression could be a bad head gasket, especially if he tried to re-use the old one. be sure to check the ring end gap. If it is too much then pressure will drain off there.