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Post by gabito503 on Apr 16, 2018 7:13:33 GMT -5
my 72cc bbk vibrate so bad In the morning!!
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Post by 90GTVert on Apr 16, 2018 7:21:39 GMT -5
 I assume this is a four-stroke 139QMB? Is it just that it idles low perhaps when it's cold?
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Post by gabito503 on Apr 16, 2018 8:25:45 GMT -5
yes 139qmb everything was gine the vib just start this morning. after 10mnts running stops
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Post by mrkswthwrth on Apr 16, 2018 11:47:24 GMT -5
So it only does it on a cold start until it gets up to operating temperature?
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Post by dexameth on Apr 17, 2018 8:48:04 GMT -5
She must not be a morning scoot. Have you tried making a good cup of coffee for her first?
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Post by GrumpyUnk on Apr 18, 2018 18:50:44 GMT -5
I would check the valve clearance adjustment. It has been long enough for the clearances to close up a bit, which could cause a poor idle. One other cause is water in the fuel. Has it been raining a lot or cold damp weather that would allow condensation to form in the tank? Normally water would cause intermittent misfire at speed also.
tom
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Post by gabito503 on Apr 30, 2018 20:50:49 GMT -5
thank guys for help!!!💪🏻💪🏻💪🏻 I put 93 octa gas and runs perfect now
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