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Discussion Starter · #1 ·
So your old OR new monoblock is spilling gas when tickled, or generally flooding? When you tap the bowl it stops, but you've inspected the needle, seat, and float and see no visible problem? Here is the likely culprit.....

This was on a brand new monoblock, but the same issue can happen on older carbs that have had floats swapped.

The casting seam of the float was contacting the left cover screw boss, where shown, binding the float in the down position causing fuel to spew.


The solution is to sand/file the corresponding area of the float to eliminate the interference. Easy fix for a super annoying, intermittent problem.
 
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