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Laenin the premix (goin from 32:one to 40:1) After all rICHENS the air/fuel mixture-this will make your problem worse. Usually, been my experience, & I have been through a few of the bitty 2-smokes, a hard starting small bore is telling you it is time for a rin job, & they need a new top end a hell of a lot more often than a big bore. If the plug is black and/or wet at 32:1, try notably rejetting the carb, but I'd guess your kids bike is still on it's origiunal top end, or has a lot of hours on the current one. Oh yah, the KX60 and 65 are totally famuos for blindly having a shaky bottom end, if your tranny level appears to be going down (principally leaking through the crank seals)-you could be hastily burning tranny oil which would cause your prtoblem as well.
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