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hi guys want to make my 05 636 faster.And i heard can do that by changing the sprocket.But i dont know if i should go 1 down in the front and two up on the rear.What you guys think thanks guy.
 

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if you want faster top end speeds you will need to go larger in the front instead of going smaller. And for the rear teeth you would want to go down teeth instead of increasing them. All you are going to achieve by removving a tooth in the front and adding teeth to the rear is a lower gear ratio which is good for coming off the line or pulling wheelies, but you will take away from the bikes top end by about 5-7% with that combination. :crazyloco
 

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i have a 05 636 and i just put on 14/45 and love it... only draw back is less speed and higher rpm on interstate around 8000 rpm instead of 6000
 

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Hey momonte03, with that -1/+2 combo on ur 636, do you feel like it was a good mod? Does it really pull alot harder on the lower end? I have an 06' 636 and I was really considering gearing it. The only problem is that I do alot of highway riding commuting to school and work, and I didn't want to have any top end issues. Does it feel like it takes alot away from the top end speed? and another quick question, I know our bikes have a stock 520 chain, soo it should be ok to swap the sprockets with the stock chain (only 1,000 miles on it)? Thanks for the input, I wanted someone's advice on it that has done the mod first hand.
 

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csementuh: if you do the 14/45 mod you will run about 8000 rpm at 65-70mhp. there is a Very stong increase in the lower end. i can hardly hang on at hard acceleration. my top speed did drop to about 140. i used sprocket specialists sprockets and was able to use mky stock chain with them.
 
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