KOTM Dec 2007 Chinto
 

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Old 08-07-2007, 09:27 PM   #1
mharrison
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Default Any Good Reasons for a Sprocket or Chain Change ?

Well, I need a new chain, so I'm planning to get sprockets too. Since this would be the time for different sprockets, I have a few questions regarding changing the gearing.

If I'm happy with my bikes performance, is there any good reason to adjust the gearing? I mean, I'd like to launch a little harder, but I also enjoy my top end.

If I adjust the sprockets for a better low-end response what will I lose at the top of the RPM's? (It drops off towards the top end of the RPM range anyway.)

What would I lose top speed-wise? I very rarely run her up that high, but on occasion I do.

Also, what are the pros/cons of a chain size conversion?

I'd appreciate any thoughts since this is my first chain drive bike.
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Old 08-08-2007, 12:01 AM   #2
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(A) Given what you had to say, I would recommend sticking with the stock gearing, or possibly increasing the rear sprocket size one or two teeth (and nothing else). If you increase the rear tooth count, you'll need a longer-than-stock chain (more teeth = more links required).

(B) Pro's of size conversion - a little bit of weight loss on the rotating mass of the bike. On a 512 lb bike, it's not likely to make any performance difference in terms of acceleration, braking. In terms of $$, it's penny-wise and dollar-foolish.
Con's of size conversion - lifespan of the chain, sprockets. Smaller chains (520's) have narrower rollers (less heat dissipation) narrower sprocket teeth (faster to deform & wear).

Hope that helps.

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Old 08-08-2007, 08:43 AM   #3
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So if I go with a 15/47 combination, what length chain would I need ?

I've decided I'd rather launch harder than hang on to my top speed. (I almost NEVER go there!)
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Old 08-08-2007, 10:30 AM   #4
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15/47 would be a 118 link chain.
This should be easy to find as a set also, for some reason the 750's came with the 15/45 and some came with the 15/47.
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Old 08-08-2007, 11:41 AM   #5
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For a 15/47 combo on a 98+, order the 98+ Kat 600 kit (the 600 had a default sprocket combo of 15/47)

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Old 08-08-2007, 08:30 PM   #6
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I put the 98+ Kat 600 kit on my '06, 750.
Going from 15/45 to the 15/47, you do feel more pull. Not a real big change but enough to notice when you turn the thottle.
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Old 08-08-2007, 08:54 PM   #7
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What kind of change could I expect to see RPM-wise and what kind of fuel & top speed changes would this create?

Also how much do you think it would throw off my speedo?

Sorry for so many questions. Still new to chain drive bikes.
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Old 08-08-2007, 10:15 PM   #8
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My 47-Tooth Katana Sprocket webpage has the exact percentages of changes you can expect, etc:
http://www.motorcycleanchor.com/kata...sprockets.html

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Old 08-09-2007, 04:58 PM   #9
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Quote:
Originally Posted by mharrison
What kind of change could I expect to see RPM-wise and what kind of fuel & top speed changes would this create?

Also how much do you think it would throw off my speedo?

Sorry for so many questions. Still new to chain drive bikes.
My rear sprocket is -2 (43 tooth) and the speedo is exact. So I'm guessing it would throw it about 10 mph off since stock is about 5.
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Old 08-13-2007, 11:31 PM   #10
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How does changing the gearing affect the speedo? The speedo cable is on the front tire on my 94.
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