free up piston rings?

[Hansmanbo]

pull spark plugs and fill with ATF overnite. For stubborn stuck rings I use laquer thinner, but you must change oil afterwards. I've had good results with this. Be sure to hold your head back when clearing cylinder..... ask me how I know....

 

[Joep]

Went to El Camino Vintage Bike Swap Meet last Saturday. Saw several CT90s and 110s.
I wonder if I can put 110 engine in..

Yes the 110 is just about the same exterior dimensions..

 

[skiri251]

pull spark plugs and fill with ATF overnite. For stubborn stuck rings I use laquer thinner, but you must change oil afterwards. I've had good results with this. Be sure to hold your head back when clearing cylinder..... ask me how I know....

Thanks.

I may try this if the rings won't free up after several engine runs. But I guess I need to make sure the engine is in compression stroke. This is 80 degree forward tilted engine (almost horizontal).