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08-08-2015, 02:14 AM | #1 |
Join Date: Aug 2015
Posts: 1
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just installed a 80cc big bore kit and want more speed
Hey i just a installed a 80 cc airsal big bore kit in my Baotion Retro (BT50QT-11) scooter, it has the 139 qmb engine btw.
Going up hills and acceleration has improved a lot, but i would like to make it go faster i got maybe a 10 km/h speed improvement after i installed the kit. What should i do buy a new carb or just install new jets if so what what size would you recommend? thinking about buying some roller weights as well but not sure which ones to buy, it got 7g weights stock. i am supremely fat and weigh around 300 lbs btw. any other suggestions to make it go faster? |
08-08-2015, 01:19 PM | #2 |
Join Date: Dec 2013
Location: Western New York
Posts: 454
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Maybe you need to lower your expectation, of what such a tiny engine is capable of doing. You have to know how many rpm's your engine is producing at top speed, before tuning your cvt....so, do you have a tachometer? One would think that if it came stock with 7 gr weights, that after a bbk install, a heavier weight would be ok. But this may not be the case, considering your size.
So is it cranking out 8000 rpm's at top speed.....or unable to reach 6500? |
08-11-2015, 07:43 AM | #3 |
Join Date: Jul 2008
Location: York PA
Posts: 339
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IMHO, you need to look here:http://www.partsforscooters.com/Stre...gines-Complete
You can get a new 150 cc motor for $415.00 to $425.00 you'll have the power you need.
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08-11-2015, 11:34 PM | #4 | |
Join Date: Jul 2015
Location: schofield, wi
Posts: 23
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08-11-2015, 11:50 PM | #5 | |
Join Date: Jul 2015
Location: schofield, wi
Posts: 23
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08-12-2015, 07:26 AM | #6 |
Join Date: Jul 2011
Location: Connecticut
Posts: 493
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Having installed literally dozens of bbks on 139, 1p40, 157 and 152 engines, as well as being extensively familiar with all makes of scooters since I built my first Lambretta in 1988, I will now state that achievement of any flat land speed of over 5Omph on a 73cc 139, is pretty good, and about all it will do.
Mods help the 139 gain acceleration, but really don't do anything to the top end. A 73cc engine is approximately 4cid, or 1/3 the displacement of the cheapest lawnmower available at Wal-mart. To assert the modified 139 is capable of speeds in excess of 55 mph on flat ground, is untrue, and unrealistic.
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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. |
08-13-2015, 03:00 AM | #7 | |
Join Date: Jul 2015
Location: schofield, wi
Posts: 23
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08-13-2015, 06:03 AM | #8 |
Join Date: Jul 2011
Location: Connecticut
Posts: 493
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You're all kinds of wrong. I really wish the admins would stop letting you post bullshit.
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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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