FNTPuck
Well-Known Member
- Local time
- 10:24 PM
- Joined
- Jul 2, 2018
- Messages
- 855
I would not run a chinagirl piston with one ring. They have horrible tolerances, massive ring gaps, and huge ringlands. There are pistons specifically made for a single ring, but they have proper ring end gap and are usually thinner rings. I have one on my built 74cc Tomos engine that I am putting on a 20" BMX. Its 45mm though so won't fit a chinagirl, but there are 47mm versions for other mopeds that can fit.
Notice the super thin 1mm ring and the tiny ringland area. Ring gap is super tight when installed. It also has oiling holes for the bushing and is lighter weight - just a piston swap with no other changes adds a tach verified 700rpm to the top end range.
Notice the super thin 1mm ring and the tiny ringland area. Ring gap is super tight when installed. It also has oiling holes for the bushing and is lighter weight - just a piston swap with no other changes adds a tach verified 700rpm to the top end range.