My 60 has a 70's era 250 I6 and it never has run right since I bought it. I figured it was bad gas, because the gas was horrible.
But after tank removed, cleaned, lines filters etc, rebuilt carb, new cap,rotor, 3 sets of plugs, wires etc. No real change.
2 older guys I know played with carb, timing, changing plug gaps etc, and decided sounded like burnt exhaust valve, or head gasket between cylinders.
So I was gonna pull head, then a buddy says I better do compression test first.
160-170 on all cylinders but 6. It had 35. So I shot some oil into the cylinder and it jumped to 135. Then back to 35......
So No.6 is hurt. Likely a piston or ring I guess.
So out comes the 250..............
