Gear ratio for scooter?

deepsnipe

New Member
Oct 21, 2008
7
0
0
earth
Hi Guys. I need help setting up the chain on this scooter. I got the scooter with a 45 tooth rear sprocket and I would like to know what whats a good gear ratio for this scooter using a 43cc chainsaw motor and weighing 190 lbs? I would like it to have alot of top end power but not to weak down low. I also need to know whats the best way to connect the chain the the chainsaw? Can I get a new centrifugal clutch cover or do I got the mod mine?







 

comfortableshoes

New Member
Jul 22, 2008
606
0
0
Beverly, MA USA
I think that if you want to use that clutch cover you will have to mod it... I"ve not used a chainsaw before but I've read that the way the teeth are on it won't work for a bike chain that the chainsaw chain is way different than bike chain...

In 1988 I had a scooter a lot like that one. It would have been way cooler motorized, as was it wasn't very fun at all. I think my father may still have the blasted thing in his barn. Last time I went to visit he still had my 1980s huffy women's road bike in that late 70's early 80s dusty blue everything was back then.
 

deepsnipe

New Member
Oct 21, 2008
7
0
0
earth
Thanks for the calulator link that will come in handy. But I need to know a good ratio to use not how to find it. What do you all think about 10:1 or 12:1? The scooter has 12 inch tires.
 

Dan

Staff
Staff member
May 25, 2008
12,775
106
48
55
Moosylvania
The calculator will help you figure that out. RPMs+ratio+wheel size= speed. It will give you options.

Ocscully, Thanks again for that. I had zero understanding of the concept. Using that I designed a really Cool (and hopefully working) gear box for 4 strokes. Will sit behind the seat tube. Took me 4 hours and was pulling my hair out. When I "got" it, it was like "Eureka!" LOL.
 
Last edited: