different sprockets whats best? - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 12 (permalink) Old 09-20-2007, 07:07 PM Thread Starter
 
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different sprockets whats best?

I have a '05 kawasaki zx636 thinkin bout changin the chain and sprockets goin with a 520 chain which i think it already has but should i go up 2 teeth in the rear and down 1 in the front. I was told that would be a good way to go by my local bike shop but someone else told me that if i did then i would be pullin some really high rpms at crusin speed and said i should just go up 2 in the rear. Right now i run 5500 rpm @ 55mph already has a power comander III. My fisrt bike so not sure which combo is best any suggestions would help.
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post #2 of 12 (permalink) Old 09-20-2007, 07:55 PM
 
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1 down in the front is very close to going up 3 in the back (like around 2.5 i think)

where do you do most of your riding-my bike is geared for the dragstrip, and short 10-15 min freeway trips dont bother me, and im rarely on the freeway.

if you commute, id suggest against going 1down and 2up. my opinion.
maybe just drop one in the front, that mite give u the extra get-up you're lookin for. think the 636's have 525 stock, but i dont remember

theres a formula and chart-cant find it, google it, that can tell you how much higher your rpms will increase as you change sprockets. or u can do the lame math, but i suggest you find that chart online. maybe vortex' website
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post #3 of 12 (permalink) Old 09-20-2007, 08:13 PM Thread Starter
 
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mostly ride back roads but every now and the have to hit the four lane to get around in the city and bout every 3 or 4 months i may ride take a 3 hour ride on the interstate 2 meet up with a friend and go ridin for a weekend but thats not always a definate trip but i will check out the vortex web cite plan on on useing those sprockets any way and i think it may have hade a change already not sure has a speedo healer on it i know thanks for the help
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post #4 of 12 (permalink) Old 09-20-2007, 08:32 PM
 
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find out what you got, and find out what stock is
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post #5 of 12 (permalink) Old 09-20-2007, 08:50 PM Thread Starter
 
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stock is 43 teeth in rear and 15 in front have 43 in rear not sure bout front whats the easyiest way to find out
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post #6 of 12 (permalink) Old 09-20-2007, 08:54 PM
 
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Take the countershaft sprocket cover off in the front. It is like 6 8mm bolts. Then you can count the teeth. I was at a -1 up front and my rpm's aren't too bad. It was 5mph off so when the speedo says i am going 55 i am really going 50. I am currently installing a 520 -1 +3 setup. Your stock is a 525 btw.
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post #7 of 12 (permalink) Old 09-20-2007, 09:09 PM Thread Starter
 
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thanks i'll do that and jnn7404 if ya go to speedohealer.com you may be able to find something to fix your speedo if ya want not sure
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post #8 of 12 (permalink) Old 09-20-2007, 09:15 PM
 
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I think the -1 in front and +2 in the rear makes a 10 percent change overall. So you would be over 6K at 55. If you need more acceleration, I would just go +2 in the rear. Going from 15 to a 14 on the front shortens the diameter that the chain has to turn. It weakens and shortens the life of the chain as does going to a 520.
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post #9 of 12 (permalink) Old 09-20-2007, 09:16 PM
 
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05 636 rocket --Yeah I ordered one. It was just a little reference point for your rpm's. So your rpms will be at 10 mph higher. So say you are going 60 mph at 7,000 rpms on stock gearing. You will be at 7,000 rpms going 50mph on the -1 +3 kit.
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post #10 of 12 (permalink) Old 09-20-2007, 09:22 PM Thread Starter
 
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Quote:
Originally Posted by jnn7404 View Post
05 636 rocket --Yeah I ordered one. It was just a little reference point for your rpm's. So your rpms will be at 10 mph higher. So say you are going 60 mph at 7,000 rpms on stock gearing. You will be at 7,000 rpms going 50mph on the -1 +3 kit.
cool thanks
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post #11 of 12 (permalink) Old 09-20-2007, 09:26 PM Thread Starter
 
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Quote:
Originally Posted by No Worries View Post
I think the -1 in front and +2 in the rear makes a 10 percent change overall. So you would be over 6K at 55. If you need more acceleration, I would just go +2 in the rear. Going from 15 to a 14 on the front shortens the diameter that the chain has to turn. It weakens and shortens the life of the chain as does going to a 520.
i decided on the 520 conversion cause chain and sprockets are cheaper and 520 chain is less weight
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post #12 of 12 (permalink) Old 09-20-2007, 09:32 PM
 
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Quote:
Originally Posted by jnn7404 View Post
05 636 rocket --Yeah I ordered one. It was just a little reference point for your rpm's. So your rpms will be at 10 mph higher. So say you are going 60 mph at 7,000 rpms on stock gearing. You will be at 7,000 rpms going 50mph on the -1 +3 kit.
Plus most all speedos read 10 percent high. So if the stock gearing says you are doing 60 at 7K, you are really going 54. With the -1,+2 (10 percent) gearing change, the speedo will still read 60 at 7K, but you will really be doing 50.
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