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question for D.D.

 
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oneelvis
Beluga Legend


Joined: 09 Sep 2008
Posts: 272
Location: Kingston, NY

PostPosted: Fri Mar 20, 2009 7:58 pm    Post subject: question for D.D. Reply with quote

D.D., have you ever pondered putting a smaller pulley and belt on to get more speed? is it possible? i imagine it would be a good bit doggy from go. dropping a 1/2 inch in pulley size could give you 10-15 mph on your top end.
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DandyDan
Site Admin


Joined: 17 Oct 2007
Posts: 1076
Location: Victoria, BC

PostPosted: Mon Mar 23, 2009 1:24 am    Post subject: Reply with quote

Umm....I'm a little confused about what you are proposing, but it sounds like you are basically suggesting gearing the scooter a lot taller.

If that's correct, i don't really think it would be a good idea unless you also added more power. When they design a scooter, they consider a lot of factors when they choose the top gear ratio. The CV80 actually seems geared taller than the average scooter (judging by it's poor performance up hills). Generally, you can gear a scooter a little taller with an aftermarket variator to gain a few mph but such a variator isn't available for the CV80. I don't think the CV80 could pull a significantly taller ratio anyways. If you gear it too tall, it won't be able to climb hills, it'll take a long time (or never) to get up to this higher speed and it'll suck when it's windy out etc.

What i think the CV80 needs (in addition to a better pipe and bigger carb) is higher revs. My CV80 with the stock gearing, a bigger carb and better pipe was still pretty slow until about 65km/hr....the point when the revs climbed high enough to start making some real power. If you gear your CV80 way taller, you're revs will be suck around 5000 RPM (they're stuck around 6000 RPM stock) and you'll make pretty weak power.....which won't be enough to pull the tall ratio.

Besides, finding a proper belt that is thinner yet the same length is really hard. If I was going do anything, I'd toss on a size larger rear tire that would gear you about 4-5% taller.
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oneelvis
Beluga Legend


Joined: 09 Sep 2008
Posts: 272
Location: Kingston, NY

PostPosted: Mon Mar 23, 2009 11:59 am    Post subject: Reply with quote

i thought about the tire thing, i dont know about yours but on mine i only have an inch between tire and frame. but thats not including suspention travel. no-go
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DandyDan
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Joined: 17 Oct 2007
Posts: 1076
Location: Victoria, BC

PostPosted: Tue Mar 24, 2009 12:22 am    Post subject: Reply with quote

An inch where? On the sides? You could get a tire that is maybe 100/90-10 instead of 90/90-10 (if I recall the stock size correctly). That tire is 10mm wider and 9mm taller so that's less than 1/2 taller and 1/4 wider on each side (half of 10mm on each side).
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