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Backfiring

"Joe, Check the idle spark ti

"Joe, Check the idle spark timing. If it is on spec, richen the idel misture a bit. 2 Cycle motors have a lean idle "sneeze" that can sound lie a backfire."
 
it might be a clogged idle jet

it might be a clogged idle jet making it lean out also. does it run fine at full throttle?
 
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