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Post by renagade281 on Jul 18, 2015 15:22:58 GMT -5
been noticing that scooters come stock with a #75-85 main jets... somewhere in between, mine has a #91 in it... do you think it came stock like that... if i am wrong about them coming stock with smaller jets i aplologize
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Post by scooterpimp on Jul 18, 2015 17:43:06 GMT -5
Usually seen stock mj from 72-75. A few 78. On stock 139qmb. 91 is a bit high for factory/stock imo.
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Post by renagade281 on Jul 18, 2015 18:25:25 GMT -5
so should i get a smaller jet?
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Post by scooterpimp on Jul 18, 2015 23:22:44 GMT -5
Is it running too rich? Spark plug fouled? If so step down a littke & keep an eye on plug. If its running ok dont worry about it. Imo.
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Post by niz76 on Jul 18, 2015 23:25:36 GMT -5
91 MJ is the size I regularly see in the 139qmb BBK kits. The 50mm "100cc" bbk I got from ebay came with a 91 main jet....
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Post by pgs on Jul 19, 2015 9:45:53 GMT -5
when i had my gy6 it came with an 88 main jet,found out when i went to put in a bbk that it had a 63cc engine to start with the piston measured 44mm, that could be the case with yours.
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Post by renagade281 on Jul 19, 2015 16:02:33 GMT -5
hmm it says its 49cc on the panel
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Post by pgs on Jul 19, 2015 19:20:44 GMT -5
hmm it says its 49cc on the panel mine said 49cc, some of the chinese scooters did have 63cc instead of 49, mine was a quicker than normal 49cc |
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Post by renagade281 on Jul 20, 2015 5:59:46 GMT -5
Mine is definitely not quicker. Lol it tops out at about 31mph on flatland
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