help me forum!! very new here and to china girl engines. ive put about 120 mi. on my 66cc 2 stroke. everything is stock except i put the NT II speed carb and a low profile air filter on it. recently i am getting a very awful almost metallic vibration coming from the top end. its terrible and what was running 25-30mph wont go over 23 now. im thinking maybe its a unbalanced crank. not sure but it vibrates all the way up to where my spark plug is a blur. mounts are tight. head bolts also. this happens right at 17 mph. engine starts and runs fine up to 15 then suddenly it becomes a rattling monster. any input will do. thanks
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