I've been wondering about what size my engine is and i know how to do the formula for finding engine displacement but where exactly does the stroke length end or start on our 2 stroke chinagirls? Just curious thanks
Finding stroke length?
- Thread starter copmagnet80cc
- Start date
Stroke = the travel of the piston. You'll have to find TDC, top dead center of the up stroke then rotate the crankshaft until the piston is at BDC, bottom dead center. For our purposes you can simply eye ball it and measure from the top of the piston to the top of the cylinder at both TDC and BDC.
If you want to get very accurate you'll neen a dial indicator and check crankahaft rotation. That kind of accuracy is for full race engines. Not a little motorized bicycle 2 stroke.
The stroke can be measured through the spark plug hole but you'll get a better reading if you remove the cylinder head.
Hope this helps.
Tom
If you want to get very accurate you'll neen a dial indicator and check crankahaft rotation. That kind of accuracy is for full race engines. Not a little motorized bicycle 2 stroke.
The stroke can be measured through the spark plug hole but you'll get a better reading if you remove the cylinder head.
Hope this helps.
Tom
If you have a standard barrel, as in it has not been decked.
a 40 mm stroke should bring the piston to less than 1mm from deck height.
A 38 mm stroke crank will leave the piston low in the barrel at TDC.
If your motor came with a slant head it is likely a 38mm stroke.
a 40 mm stroke should bring the piston to less than 1mm from deck height.
A 38 mm stroke crank will leave the piston low in the barrel at TDC.
If your motor came with a slant head it is likely a 38mm stroke.
