Inliners International Forums General Discussion Engines Running lean on #5 cylinder?

I agree,it should'nt be the carb, nor the manifold because #6 aint the same, has to do with something downwind of the manifold-something different in that cylinder or combustion chamber than in #6. The gasket marks in the picture look pretty normal as best as we can see from the pictures. Could possibly be different sealing of the rings, or valves allowing one chamber to be more black or carboned with perhaps oil than the other. The condition of #5 dont seem too startling or extreme though. Do we know anything about the cylinder compression readings (too late now to check), but maybe when the head is back on record the readings just for record's sake.

Whoops, they were all 120-125 lbs like you stated--well, that beats me! Now after rereading the first post i'm confused -- if the block picture is really cyls 5 and six, and is the head shot really 1 and 2, OR are they the combustion chambers for the cyls (5 & 6)??