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Old 09-21-2013, 04:49 AM   #28
prodigit   prodigit is offline
 
Join Date: Jul 2012
Location: Miami, FL
Posts: 389
When you also pair a BBK with taller gears, you could improve speed somewhat.
A larger profile tire is not significantly going to increase MPH.
At most 1 or 2 MPH added to the top speed.

If the engine truly has it's torque band in the 7500 RPM, you got to try to get that top speed (55MPH in your case) at the 7500RPM, and not at 8+k RPM.
To change gears to taller gears does just that, and is probably your best speed improvement. much better than changing the variator, or performance exhaust; to optimize the top speed.
You'll also increase MPG in that case; but decrease acceleration somewhat; which shouldn't be a problem as most 150cc's can keep up quite fine with traffic from a dead stop.

Once you change the gears, you can test drive the bike, and see if you want to switch the rollers/sliders, as the variator will be maxed out at a lower speed, because it's rotating faster, and you will accelerate at a lower RPM; which is good to get better gas mileage, but if you want to optimize performance you'll have to lower the weight of the rollers/sliders, to get your acceleration going around the 7,5k RPM mark.
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