what is the best sprocket setup??? - Kawasaki Ninja 250R Forum
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post #1 of 26 (permalink) Old 05-11-2012, 12:49 PM Thread Starter
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Exclamation what is the best sprocket setup???

I just bought a 2004 Kawasaki Ninja 250R and was wanting to increase the top speed. Can anyone tell me what the best sprocket setup would be to increase my top speed?
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post #2 of 26 (permalink) Old 05-11-2012, 01:56 PM
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14 in the front and 46 in the rear will give you better top speed, but it will also increase your rpm's at highway speeds meaning worse gas mileage.

Though your mileage should still be better than bigger bikes.



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post #3 of 26 (permalink) Old 05-11-2012, 02:58 PM
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15/43 offers the best balance of acceleration and top speed provided you are maxing out rpms in every gear. Your rpm speed will decrease about 750 rpm in any given gear, but you will see an increase in top speed.

stock gearing 14/45 @ 11000 rpm, 6th gear = 89.3 mph
custom gearing 15/43 @ 11000 rpm, 6th gear = 100.2 mph
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post #4 of 26 (permalink) Old 05-11-2012, 03:30 PM Thread Starter
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Thanks. I was needing to get it closer to about 110mph but that will work great.

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post #5 of 26 (permalink) Old 05-11-2012, 04:24 PM Thread Starter
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Would i have to get a different chain with a 15/42 setup? I cant find a 42T.

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post #6 of 26 (permalink) Old 05-11-2012, 05:43 PM
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It is recommended to change the chain when changing sprockets.
11800 rpms with a 15/42 will get you 110 mph in 6th gear. The challenge is getting the bike tuned enough, to turn the gears in 6th gear to past 11500.

You can find a 42 tooth sprocket here. http://www.motorcycle-superstore.com...50R-Parts.aspx

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post #7 of 26 (permalink) Old 05-18-2012, 01:04 PM
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I have had my 04 250 at 110 and all I did was straight pipes and tuned the carb. Stock sprocket and chain. She is loud but then at least cars here me at 110.

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post #8 of 26 (permalink) Old 05-26-2012, 07:02 AM
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DaBlue1, thanks for the quick response to my question. Before I bought my bike, I read numerous road tests. They stated 60 mph = 7,500 rpm's. I was shocked that mine was 9,000 rpm's. Because it's linear (gearing, not exponential) that computes to 12,000 rpm's = 80 mph, and redline (13K rpms) = about 87 mph. I created a spreadsheet with all the math in it according to the owners manual, of rpms/primary gearing/gearbox gear ratio/final drive, tire circumference, etc and the only way I mathmatically get 60 mph = 9,000 rpms is with a 20 inch diameter rear tire (but it's really 23). I wonder if they changed some gearing and didn't update the owners manual? I'm going to do what you suggest and change to 15/43 gearing to hopefully get the best of both worlds (reduced rpm's and still have some power). Thanks also for the tip about the fuel gauge undertank wiring, I'll check that out.
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post #9 of 26 (permalink) Old 05-26-2012, 11:05 AM
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@zx9r; You should be going about 73 mph in 6th gear @ 9k rpms. 65 mph in 5th gear (actual speed). The speedos are known to be off a little, but not by so much. They are usually about 5 mph faster than the actual speed.
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post #10 of 26 (permalink) Old 05-27-2012, 06:43 AM
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I agree with what you're saying (according to the magazine articles I've read) but that's not what I'm seeing. I'm making sure I'm in 6th gear (counting the shifts and even when I'm in 6th pulling in the clutch and trying to shift up again to no avail), but 7,500 is 50 mph (I also agree with you on speedo error - my 73 XLCH indicated 60 mph at a radar timed 49 mph) and 9,000 is 60 and yes the engine is screeming. That calculates to 87 mph at 13,000. I counted the teeth on both the countershaft (14) and rear wheel (45). I don't get it? On "Motorcycle Superstore.com" I noticed they sell TJ sprockets from 45 down to 38 for the rear wheel and even have 15 & 16 teeth countershaft sprockets? I'm thinking of going to a 15/39 combination and see what happens? If I don't look at the tach (and my other bike is a 1600 cc Nomad) and shift at what seems a "normal" shift point, I find I'm in 6th gear at about 30 mph and it "pulls" just fine. 30 mph is 4,500 rpm's. Stay tuned....
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