0105
2nd Class Ticket
Posts: 49 
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Post by 0105 on May 16, 2017 18:29:33 GMT
My scooter is machine gunning and struggling to hit 50mph it's a 125 with "I think" a 150 top end, polini Venturi and a stainless expansion exhaust, currently running a 114 main jet an e3 atomiser and 160 air corrector in a 20/20 carb should I go up or down on any of these jets to try and eliminate the "machine gunning"?
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Post by pxguru on May 17, 2017 4:20:01 GMT
By 'machine gunning' I assume you mean spluttering. Down one main jet size at a time until it revs right out cleanly. As it starts to feel better, do some long runs wide open and check the plug colour to see if you need to go down another jet size.
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0105
2nd Class Ticket
Posts: 49
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Post by 0105 on May 17, 2017 7:22:02 GMT
Can the atomiser/air corrector and the pilot jet also affect this?
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Post by pxguru on May 17, 2017 15:01:46 GMT
Are you talking about when at wide open?
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0105
2nd Class Ticket
Posts: 49
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Post by 0105 on May 17, 2017 17:33:20 GMT
No when I try to sit at a steady speed in any hear it starts happening
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Post by pxguru on May 18, 2017 9:12:54 GMT
I would think a 114 main jet is too big for even a standard 150. Carefully try a jet about 108 and see how that is. It will probably still be too big but see how it feels and go from there.
Never forget that 2 main jet sizes under where is should be will cause overheat and maybe even seize up. Like 135 is perfect, 132 has more power but gets hot and 130 heat seizes. When its right you are never more than 2 jets from risking damage.
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0105
2nd Class Ticket
Posts: 49
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Post by 0105 on May 19, 2017 21:49:46 GMT
Remember I am running a polini Venturi and expansion exhaust a non restricted 150 runs a 98 main jet and s.i.p recommend going up 5-8 sizes for the polini Venturi and 3-5 sizes for the exhaust?
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Post by pxguru on May 20, 2017 8:20:23 GMT
So that means between 106 and 111.
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