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lean plug

Moderators: Curt!, Pa

Post Tue May 06, 2003 3:11 pm

Posts: 118
Location: cornwall, ontario,canada
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

Post Wed May 07, 2003 1:50 am

Posts: 39
Location: SW NH USA
Could be cam timing or air leak what is the compression like?

Post Wed May 07, 2003 2:30 am

Posts: 3010
Location: Central Illinois, USA
Exactly HOW was this thorough leaktest performed?

Smells like Evil Manifold Leak to me!

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