ive got a 76 ke175 an ive been riding 2 strokes since i was 5 and i have never heard a pinging consistantly coming from the bottom end i just rebuilt the topend so that rules out piston rings wrist pin and small end bearing. does anyone know what can caue this?

 

help is appreciated.

 

Not sure if you did a leak down test, but my first thought would be a gasket leak (base, head, exhaust) since the noise has happened after your top end rebuild.

Welcome to KF

 

Welcome to the forums, I had a two stroke do that a million years ago, and it turned out to be the exhaust was loose.

 

Thanks for the reply sorry i was on vacation an had no computer but just yesterday i did a leak down test and came out 100% so that rules out leaks, when i did the test the plug was gray and seemed like the bike was running super lean so im getting that sorted out now but i dont think itll make the noise go away, and i did check my exhaust and replaced the copper gasket so it's snug. the funny thing is while i had the exhaust off i could see the piston moving in the cylinder and it seemed like the piston rings where expanding at the exhaust port which i thought might be causing the noise? could the rings be too big or on wrong i put the wide ring up top and the expander ring and narrow ring on the bottom groove?