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Old 12-29-2013, 02:08 AM
Motorized Bicycle Elite Member
Join Date: Jul 2010
Location: CA
Posts: 1,753
Default Re: what did you do to your motorized bicycle today?

Originally Posted by crassius View Post
the plug leak could cause several things that will rob you of power - it needs fixing, so do so & see

head comes off easily for sleeving or helicoiling if you don't have easy access to another head

fixing this might even reduce the spit-back from the carb
You could bring it to a machine shop to install the Helicoil if it seems to be economical and you don't want to buy the special sized drill bit and Helicoil insertion tool and coil insert. I can say once those are installed I have never had a problem ever with cross threading again.

There are other non-spring type inserts, but my thought on those is there not worth using as they are as soft as the white metal they cast the head with.


Last edited by MEASURE TWICE; 12-29-2013 at 02:11 AM.
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