XR 500 pop pop popping!

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motomike

Pack Dog
Joined
Jul 24, 2010
Messages
440
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Location
Walvis bay
???
After the rebuild ,the first few rides were exhillirating,and it was quite novel..the popping and occasional backfire when you decelerate....however it  MUST BE GONE!! and ive done all I can think of to rid the problem.
Yes, the carbs been completely re kitted,with new shut off membrain too
Yes,Ive gone from a 53 to a 60 slo jet....yet the plugs still brownish and for me, burning a bit lean
Yes ive tried different plugs  but can only get(NGK D8ea and NST D8TC) locally.
Yes ,ive rechecked valves clearance and if the intake/carbholder's sucking air.
So ,asseblief  "Runner...LeCap and the other fundies" shed some lite here.
Ive read also that it could be a low voltage problem,but dont know how,cos theres no starting/ideling problems,and maybe i can turn the pilot screw a tad richer,but as said ive upped the slo jet and pilotscrew is 3 turns out.
Sooooo whats the solution guys???
 
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