Thread: Top Speed
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Old 08-09-2011, 11:34 PM
5-7HEAVEN 5-7HEAVEN is offline
Motorized Bicycle Elite Member
Join Date: Aug 2008
Posts: 1,912
Default Re: Top Speed

Non-Happy Time setup:

Scooterguy center frame-mounted Tanaka 47R kart stock 2.8hp engine, plus
Tanaka three-piece expansion pipe w/resonator and OEM muffler
Shift kit w/pocket bike gearbox, 8mm chain and sprockets
First gear - 37.09:1 gearing, like a HT 89-tooth rear sprocket
Second gear - 28.36:1, like a HT 68-tooth sprocket
Seventh gear - 16.36:1, like a 39-tooth sprocket
Eighth gear - 12:1, like a 29-tooth HT rear sprocket

Top speed without trying.....47.4 mph
Cruising speed.....35-40 mph
100 mpg
200lb rider
40lbs of gear
70lb bike
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