Posts: 18
Joined: 1/21/2009
Location: Phoenix, AZ USA
I just picked up a 1975 Honda XL125. I am in the process of going 1 over on the cylinder and I can't find
the piston cylinder clearance specs anywhere. I think it is .0004 to .0012. I already picked up the piston
but I need to let the machine shop know the final clearance. If anyone has any idea what the clearance should
be I would really like to know. I need to get the shop manual!
Thanks in advance.
Posts: 681
Joined: 12/24/2011
Location: Benton, LA USA
If it's the OEM piston, then use the spec's from the manual.
If it's an after market piston, then use that company's spec's. They should have come with the piston.
Paw Paw
Posts: 18
Joined: 1/21/2009
Location: Phoenix, AZ USA
Thanks Paw Paw. Its an OEM piston. I'm going with .0015. I still need to get a manual. I talked to a Honda shop
owner who was a Honda mechanic in the late 60s thru the 80s.
Posts: 1152
Joined: 5/13/2015
Location: Harrison Twp., MI USA
Is the piston cast? If so you shouldn't have any problems running it at .0015
Race Bike: 2018 KTM 350SXF
Other Bikes: 1985 CR80R, 1990 CR250R, 1998 PW80, Yeti SB130LR.
Sold: 2016 YZ250F, 2012 CRF250R
