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09-17-2016, 07:51 PM
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#1 |
 Join Date: Jul 2016
Posts: 18
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Differences in carb mm
What is the differnce between a 10mm and a 20 mm carb. Upgrading from stock for the 100cc upgrade on my qmb139 engine. Only upgrade im trying, ive went back to stock on everuthing excwpt the 9g sliders, had 8 g rollers stock. The carb is where im playing aroumd now amd looking for tips as well. Stock airbox or open element filter? Proper hose connections for each way as well. There is one hose from stock nox to the vavle cover im not sure what to do with with the small filter.
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Smm jazzie gy6 , from 50 to 100cc Orange black cdi cable Purple racing cdi box 20mm carb jets unknown as of now Open element air filter Mirror stereo system Roller weight nd clutch spring unkown Rider 6 foot 270 pounds |
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09-18-2016, 06:14 AM
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#2 |
 
Join Date: Jul 2011
Location: Connecticut
Posts: 493
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Your 139qmb uses a 17 to 19mm Kiehin style carb. Using a bigger 157 style 21mm carb or flat-slide carb does not improve performance, as you must "jet down" a big carb.
Your 100cc (83cc) would prefer a 88 to 90 main jet.
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2011 Roketa MC-23-150 4T 150cc 157 qmj 24mm carb w 115 main jet and paper cone air filter Manual petcock w Tygon fuel lines Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust RED spring clutch Adjustable CDI (brand unknown, it's blue and red and works great!) KOSO high performance variator w 12g sliders Gates Powerlink 835-20-30 belt GPS verified 65mph on flats. |
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