hi,having had a rebore, newpiston and rings, i have pressure tested the crank case, ok. new gaskets all round. tested every gasket and joint with soapy bubbles, compression test still struggles to make 100 psi. any new ideas please?thanks once again bill johnson.

does it reach 100psi then? thats not bad in my book for a cold engine

Another thought.

If the exhaust port has been raised by a previous modder, this will drop the compression ratio.