96 rm125 wierd noise

I have a 96 rm125 that sounds like an old 5.9 cummins when idling and smokes worse than it should has afresh rebuild only started once with new piston and rings. It runs great just this wierd noise and smoke, i'm running 32:1 87 non ethanol fuel in it as well i'm new to 2 strokes so i'm not sure whats wrong also has fmf fatty with fmf shorty. Any help would be appreciated thanks.

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