"CG125" Clone

[jamrock876]

Originally Posted by jamrock876

A question though, I have been battling an odd issue with my cousin's CG-based engine. The valves, primarily exhaust, repeatedly "get tight" or drop entirely shortly after being properly adjusted. I have checked the pushrods are straight, checked that the timing is correct and the camshaft is within spec.

This all started after the rebuild from the first dropped valve, my working theory is that it is running lean and overheating which leads to the valve stretching and or the seat receding, is this a possibility

I am aiming to have both bikes -CB250 "Hi rev" and my cousin's CG150 "zhujiang"- down today for maintenance and service and would appreciate any input provided.

Been a while since I have been online. Issue with my cousin's bike turns out to have been a slightly bent pushrod. Bike has since been fixed and sold on to a new owner.

I am still daily-ing the "duroad" 150 but seriously considering upgrading to a Japanese 600cc. For a bit I toyed with a 250cc engine (RE250 based) but that turned out to be about as fast as my 150cc so it was sold on.

For the past 6(ish) months I have been running a pwk28 carb with a 32 pilot and 120 main. This seems to be "just what the doc ordered" for my climate conditions and has been good for the most parts, occasionally going a bit lean on the pilot in colder weather and spitting flames.

While I do have this bike though, I am still searching for a flywheel key that will work to advance timing. I don't think I will ever be able to part with this bike and am considering going the stunt route one it has retired from daily duties.