Go Back   ADVrider > Bikes > Old's Cool > 2 smokers
User Name
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
Old 02-05-2012, 12:07 PM   #1
LotaBikes OP
Joined: Aug 2010
Location: La Verne CA
Oddometer: 82
1965 YJ2 Low compression (60 cc)

Maybe someone can help with a few questions I have. I have a 1965 YJ2 that I am restoring. Everything is basically done except getting the tank re-chromed. I am having some mechanical issues however.The issue is that the bike will start and idle and will rev with no load in neutral. It has no mid-range or high end power though when I go to ride it. Bogs out and dies. So far I have cleaned the carb (multiple times) and adjusted the floats. I have replaced both crank seals, the head and base gaskets. I have done a leak down test and it lost maybe 1/2 psi over 6 mins. The biggest issue seems to be compression. The compression test shows only 40 psi. I didn't think it would even run with it that low.The bike only has 1100 miles on it. I would'nt think the compression would be so low. Do I have to rebore and go to the next size piston or will new rings do the trick? How do I tell? If I do have to get a new piston and rings, what do I tell the machinist the clearance should be? Or should he already know? Any help would be appreciated.
LotaBikes is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Times are GMT -7.   It's 04:38 AM.

Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2015