the 50's are smoother because the 80's are just 50's with a bigger piston's the crankshaft isnt properly ballanced for the larger pistonThe 49cc's do indeed seem a bit smoother/ rev out a bit higher. My 66cc's chrome bore has had no problems after about 700 miles. I have heard some stories about steel sleeves being put in crooked though.
Wouldn't that decrease displacement? The bore is larger too..the 50's are smoother because the 80's are just 50's with a bigger piston's the crankshaft isnt properly ballanced for the larger piston
What he's saying is that the 80cc is a 50cc lower-end with a larger piston and cylinder slapped on top. It's not literally just the piston, of course it's the cylinder too.Wouldn't that decrease displacement? The bore is larger too..