cylinder dimensions?
- Thread starter westly
- Start date
Bikeguy Joe
Godfather of Motorized Bicycles
I'll bump this....I have measured four "49cc" engines, and the bore and stroke were different on three of them, so you may want to measure the one you have.
I have just got my first 48cc. And it is open.
Bore: 40mm as expected.
Stroke: 38mm as expected.
Inlet open: 108° (18.5mm wide)
Exhaust open: 143° (23mm wide)
Transfers open: 110° (19mm wide)
The porting times are measured including the piston ramp which is about 0,8mm. Unfortunately, I do not know which company has produced my engine.
For me it would be interesting to know the timing of other HT engines.
Bore: 40mm as expected.
Stroke: 38mm as expected.
Inlet open: 108° (18.5mm wide)
Exhaust open: 143° (23mm wide)
Transfers open: 110° (19mm wide)
The porting times are measured including the piston ramp which is about 0,8mm. Unfortunately, I do not know which company has produced my engine.
For me it would be interesting to know the timing of other HT engines.