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Old 05-19-2013, 08:14 AM   #8120
Beastly Adventurer
mcma111's Avatar
Joined: Jul 2007
Location: San Francisco,Ca.
Oddometer: 12,403
Originally Posted by Captain115 View Post

Remember I only rode a couple of km.


Just how far did you ride the bike? The cam and rockers look fine. No issue there. The piston and cylinder on the other hand do not look good for a fresh start up. I know you had the lower end apart as you replaced some transmission parts. It looks like there was some contamination that marked up the piston and cylinder. Have the piston and cylinder measured again. What size piston did you install? I'll call my machinist and ask how much clearance he would have set the cylinder to. Usually it's 3 to 4 thou. Did you oil the rings and piston or install it dry?
Steve in SF

58 R26
79 R100s
91 R100gs

87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
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