Can loose and missing exhaust manifold bolts (2 missing and 1 loose on one side) cause my motor to suddenly go lean? My plugs are white after a hard run thru the woods(normanlly a nice tan color) The dealer says it would trigger the motor to run rich. My past experience in other motors (typically 4 stroke) was that it would produce a lean condition. The sled is my 06 Gade 1000X. Thanks for any help.