how can i tell if i have a #420 or #428 chain?

[zumanity]

ive looked over the sprockets and neither have any markings on them to tell me what # they are.
is there a way to identify what they are as i want to get a bigger front sprocket.

cheers
zumanity

 

[Maylands Performance]

Hi zumanity

Chains usually have 420 or 428 stamped on the side plates !

As for the sprocket widths here goes -

420 sprockets are 5.70mm Wide

428 sprockets are 7.14mm Wide

Hope this helps

Cheers Brian

 

[zumanity]

thanks brian!

i have a lifan 125cc motor and am wondering about the spline size for the sprocket.
from what i understand there are two sizes.
which one fits the lifan 125?

 

[pitmaster]

17mm "Coarse splines" for the 125cc Chinga

Crf50 run "Fine splined" shafts,

 

[zumanity]

so if the distance between the teeth on the sprocket is 10mm, what # chain do i run?
cheers