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Old 02-09-2009, 04:12 PM
mrrf900 mrrf900 is offline
Motorized Bicycle Newbie
Join Date: Feb 2009
Location: New Zealand
Posts: 1
Default Hi from New Zealand


just popped in here to ask for some advice on a "project" I'm building. I guess technically it's not a bike (see pic) but it had its beginnings as a bike.

My intention is to motorise it with a 70cc 2 stroke chainsaw engine.

I intend running a 12 - 15 tooth sprocket on the engine and 70 - 80 on the axle of a 20 inch tyre.

My concern is that using this set up will give me a drive ratio of around 6:1 which calculates out to a top speed of about 95km/h at 6000, which is not even top rev's for the engine.

Do you think this set up will work or am I dreaming??

Thanks in advance for your help.

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Old 02-09-2009, 05:02 PM
Bikeguy Joe Bikeguy Joe is offline
Godfather of Motorized Bicycles
Join Date: Jan 2008
Location: up north now
Posts: 11,531
Default Re: Hi from New Zealand

I would go with more reduction....other than that, go for it!

Welcome to the biggest, most informative forum on the web for motorized bikes, and such.

Check out our DIY forum for more info from world class experts!
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Old 02-09-2009, 10:53 PM
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Dave31 Dave31 is offline
Super Moderator
Join Date: Mar 2008
Location: Old Pueblo,Arizona
Posts: 11,118
Default Re: Hi from New Zealand

Welcome to the forum, glad you joined us.
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Old 02-11-2009, 01:30 PM
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wheelbender6 wheelbender6 is offline
Motorized Bicycle Elite Member
Join Date: Sep 2008
Location: TX
Posts: 3,752
Default Re: Hi from New Zealand

Welcome to the forum. Your project looks like fun.
“You're only young once, but you can be immature as long as you like" -Unknown
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