2001 cr 125 piston size??????????
Posted 06 December 2009 - 06:34 PM
so heres my little strory/problem
i bought used 01 cr 125 few months ago and wanted to have some fun with 2stroke(cause i tried 4 stroke eariler but not too big fan)
i rode it with times and noticed black oil coming in little drips from exaust noticeable on the right side of the swing arm.
my friend told me that i should check the compression on top end and most likely i need to replace the piston with the ring
i did check it and the compression was 75 psi, which is way too low , as far as i've read,
bought the new standard size piston "B" for 2001 cr 125 , put it on , and compression is just the same
while putting it back together i noticed that on the very low left side enginge cover, right under gear lever it says piston stroke 54.5 mm
is this the piston size that i need?cause when i bought new standard piston and ring i tried it in my hands in the cylinder and it felt pretty tight, but i measure it and it was close to 54 mm
what is my problem ??????????????????????????????????
PLEASE HELP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Posted 06 December 2009 - 06:37 PM
Posted 06 December 2009 - 06:58 PM
What do you think?
Posted 06 December 2009 - 07:25 PM
What is within spec?>
i measured it with digital caliper and it reads almost 54mm
so i was hoping that the standard piston b that i bought would do the thing
Posted 07 December 2009 - 01:57 PM
Posted 07 December 2009 - 05:42 PM
Posted 07 December 2009 - 06:53 PM
For example Honda explain that the correct piston to cylinder clearance is 0.03-0.06, if you cylinder is 53.97 mm you need a 53.92 piston (0.05mm clearance)
Pro X and Vertex produce oversizes piston for worn cylinders (a,b,c,d)
Sorry for my english:thumbsup: