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Old 02-22-2013, 12:11 AM
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GearNut GearNut is offline
Motorized Bicycle Elite Member
Join Date: Aug 2009
Location: San Diego, Kaliforgnia
Posts: 5,106
Default Re: what did you do to your motor bike today?

That sounds like an exhaust gasket leak. The exhaust can spew out black oily gunk if the gasket is leaking. If the head gasket is leaking it will spit out a fine oily mess on the outside of the engine that can turn black after road crap sticks to it. The only black you'll see is the first 1/2" or so directly around the leak itself after you remove the cylinder head. Also a head gasket leak will cause a lean condition and the engine will run wrong.
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