HI guys,

When I ease off throttle to 5.5k, I get a bucking, almost jack-hammer effect in the power delivery. It is not a hesitating, bogging but rather fast on-off-on kind of bucking or judder. Andy, I know we are not to discuss jetting here, but I do not think this is a jetting setting issue per se for two reasons: first, the bike accelerates up through the rev range to redline just fine, no stumbling, bogging, or the like; it is only when I am cruising along in traffic say and have to come off throttle at 5.5k that I get this...actually it happens less noticeably also at 7k, if that tells you anything. The other reason I don't think it is jetting settings is the bike started doing this with my having made no jetting changes whatsoever. It MAY have started after I had some AV gas sitting in the tank for a couple weeks because I wasn't able to ride, but I am not at all sure that is when it started....

So NSR Gurus, can you give me any idea what this could be or what I might do to remedy the situation? I am sort of riding around it now, but it is not as it should be...or was. Thanks for any help.
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-Jim
'93 MC21