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Old 07-12-2009, 11:54 PM
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Nashville Kat Nashville Kat is offline
Motorized Bicycle Elite Member
Join Date: Apr 2009
Location: Jacksonville, Florida
Posts: 1,403
Default Re: need help in getting more top end speed

Usually the problem- reported all the time- seems to be too rich- to much gas to oil-

Does the slightest chocking kill the motor?

Close the petcock down by degrees- you may notice it runs better then-

too rich

most everyone here, myself included- usually thinks not getting enough gas at first

close the petcock down all the time, or mix in more oil, probably the better solution- and motor will probably last longer-

I drilled about five holes in the back of my air filter which helped a lot, more air to gas- leaningit down when it really gets flowing

s smaller rear sprocket like the 36 I installed really helps, because the motor has always run better under load, and now cruises faster

Narrower tires are the old bike racer trick- smoother tires roll much better than knobby too.

keep things lightweight- especially rotating weight- wheels, crank, chain- we used to say when racing that an ounce off the wheels was worth two off the frame

a bigger wheel is like putting on a slightly bigger gear- 27" or 700C is about four percentage up from 26" when you multiply it roughly by four to get 100 percent-

so a motor turning the rear sprocket the same rPMs will move the bike 4 percent faster with the larger wheel- 25 mph would then be increased by one mph, to 26 mph,

and greater then as the speed goes up- not as much difference as changing sprockets, but some- and the rolling resistence of a 1'1/4 inch tire is sooo much less than a 2.25" cruiser tire- if you don't mind the risk
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