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Old 04-09-2012, 06:37 PM
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tooljunkie tooljunkie is offline
Motorized Bicycle Elite Member
Join Date: Apr 2012
Location: Manitoba,Canada
Posts: 659
Default Re: bike is way slow, any ideas?

i put a tach on my grubee,48cc.tops out at 6300 rpm's.i read somewhere 7000 is the peak rpm for these engines.
if you could get your hands on a tach and compare the two,you may at least have an idea what you are revving.
youtube has a great video about four-stroking,the demonstration clarifys things.

Last edited by tooljunkie; 04-09-2012 at 06:39 PM. Reason: added link
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