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Old 10-15-2013, 09:15 AM   #16
MortimerSickle
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Joined: Dec 2005
Location: Rainville, Orygun, where moss is a road hazard.
Oddometer: 11,566
This will probably only add to the mystery, but I bought a low mileage 990 that had weird deposits in the intake tracts.

I never did see the throttle bodies of the bike it came out of, but the intakes looked like this:



I brushed it out as well as I could, then ran it several thousand miles with carburetors. When I pulled it apart for my first valve adjustment, the intakes were clean as could be.

I have seen similar pics posted, and often the condition is blamed on ethanol fuel. But, almost all of the fuel I use is E10. so I doubt that theory.
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