DT 125R backfiring fault

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So bike has had everything new ..coil ,regulator. battery .stator even used my mates parts coil and regulator off his running dtr and still getting same thing bike was ok other day now doing the same thing again. Just had new crank seal and collar done...bike has been fault less for 2 years reliable but now when it starts it just back fires and pops when i try and rev it ..its been checked with mulit meter its had compression test 128 psi ....usaly sounds mint on full revs anyone had same problem