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lean plug

Moderators: Curt!, Pa



Posts: 118

Joined: Tue May 29, 2001 12:01 am

Location: cornwall, ontario,canada

Post Tue May 06, 2003 3:11 pm

lean plug

A friend of mine has a 48 Bonneville Chief with a fresh rebuild. He has made a thorough effort on a leak test and has discovered none. The problem is the front cylinder spark plug is completely white (lean ? ) the head, however is carbon filled and the exhaust valve is showing signs of heat (white)possibly from the fire of the spark plug? The rear cylinder is washing out (getting oil in it). Any suggestions. Can it be the cams, timing, etc.... Any help would be appreciated, Thanks


Posts: 39

Joined: Mon Feb 21, 2000 1:01 am

Location: SW NH USA

Post Wed May 07, 2003 1:50 am

Could be cam timing or air leak what is the compression like?


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Posts: 2979

Joined: Thu Sep 30, 1999 12:01 am

Location: Central Illinois, USA

Post Wed May 07, 2003 2:30 am

Exactly HOW was this thorough leaktest performed?

Smells like Evil Manifold Leak to me!

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