+>[My problem] turned out to be a screw unscrewed inside my Mikuni HS40 
+>carb.  I keep hearing that one should keep all of the screws
+>tight on a bike, but I never thought that I had to do that
+>on the screws inside of a carb.  At least it was roadside
+>fixable and I was on my way in hardly any time.
+
+Gee, I always figured that it was the loose screws on/in the _rider_
+that were most likely to cause any problems.  Did you check for that
+at the same time?

That is very true.  However, screws have been loose on this rider
for quite some time, so they had been taken into account.
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		Russian Roulette is fun 5 out of 6 times