Front/Rear Sprocket Combos - Kawasaki Ninja 250R Forum
 
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post #1 of 5 (permalink) Old 01-15-2012, 06:32 PM Thread Starter
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Exclamation Front/Rear Sprocket Combos

Ive searched all over the interweb and couldn't find the specific answer i was looking for. so here goes. i plan on putting a 15T front sprocket and 44T rear on my (2012) Ninja 250 because i want to lower highway rpms. i know the 15T is a good choice from what Ive read, but im not sure what size to go with on the rear. if anyone has a better combo to reduce highway (70-80mph) rpms, let me know
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post #2 of 5 (permalink) Old 01-15-2012, 08:19 PM
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Most find that a 15/41 or 15/42 set up is better for what you want to do. You still maintain low end acceleration and reduce top end rpms and better top speed.

With a 15/41 setup, 7.5k rpm will get you approx 72 mph(actual), 75 mph (indicated) in 6th gear. Make sure you shim the needles & remove the snorkel as it makes the bike ride better with the sprocket change.

Last edited by DaBlue1; 01-15-2012 at 08:26 PM.
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post #3 of 5 (permalink) Old 03-07-2012, 06:34 AM Thread Starter
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Blue, its been some time, and i have changed out my sprockets, im running a 15/42 setup. being that i am an idiot when it comes to mechanical stuff, what is shimming the needles and removing the snorkel...what is the purpose and why does it make the bike "better"
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post #4 of 5 (permalink) Old 03-07-2012, 10:07 AM
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Simply put, shimming the carb needles allows a little more fuel in the midrange and removing the snorkel allows a little more air throughout the range. All this equals a little boost and power to the bike, especially in the midrange rpms (7-10k). It also smooths out the acceleration, in other words it will get rid of that flat spot @ 7-7.5k that might be happening in 6th gear.

Last edited by DaBlue1; 03-07-2012 at 03:19 PM.
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post #5 of 5 (permalink) Old 10-18-2014, 10:06 AM
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Interesting read. Thanks for the share.

Last edited by Apple91; 10-19-2014 at 03:15 PM.
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