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Discussion Starter · #1 ·
I am trying to decrease my high speed rpm's without losing to much acceleration in my lil 250... I know that one tooth larger on the front will get me the lower freeway rpm's and improved mpg... And I also know that more teeth on the rear sprocket will increase acceleration and increase the freeway rpm's... What I'm curious of is if by going one tooth larger on the front, and just one tooth larger on the rear will counteract each other or give me just the right mix to slightly lower my high speed rpm's without losing much acceleration??? Thanks!!!
 

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Discussion Starter · #6 ·
Thanks for the advice! I will go with 15/43 and let you know how I like it... I will do it myself so maybe I'll send some pics also... Til then...
 

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I'd like to do the same thing with my Ninja 1000. Bike gets a bit buzzy at highway speeds and I wouldn't mind giving up a little torque for smoother long distance rides. Anybody have any opinions on a good compromise?
 

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I'd like to do the same thing with my Ninja 1000. Bike gets a bit buzzy at highway speeds and I wouldn't mind giving up a little torque for smoother long distance rides. Anybody have any opinions on a good compromise?
I'm betting one tooth more in front.........:whistling:
(what im doing to my 650 when time comes)
But i know someones gunna say something like........:dance:
15 more in front n 180 less in back......:facepalm::facepalm:








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I've geared my SV up 1 tooth on the countershaft to drop cruise RPMs on the hwy. Worked well for the SV, as it has plenty of torque to pull taller gearing no problem. Generally you can expect about a 500 RPM drop from 1 tooth additional on the countershaft. Same thing can be accomplished by reducing the number of teeth on the rear sprocket (usually about 3T on the rear), but generally it's less expensive to do the countershaft and the result is the same (as long as the ratio is the same of course).

You have to balance your gearing for your factors. Do you do a lot of hwy riding and want a lower cruise RPM - does the engine have enough power on the hwy if you do? Are you a large person and need more torque? What are your engine's characteristics - will you be dropping the RPMs into a flat spot in the power curve if you alter the gearing? There's no one right answer for everyone. You need to consider all the factors that you personally are working with.

As far as sprockets go, I was impressed with the Sunstar rear sprocket my son just bought for his Ninja. It's black, made in Japan, and was reasonably priced.


Jay V
 

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I've geared my SV up 1 tooth on the countershaft to drop cruise RPMs on the hwy. Worked well for the SV, as it has plenty of torque to pull taller gearing no problem. Generally you can expect about a 500 RPM drop from 1 tooth additional on the countershaft. Same thing can be accomplished by reducing the number of teeth on the rear sprocket (usually about 3T on the rear), but generally it's less expensive to do the countershaft and the result is the same (as long as the ratio is the same of course).

You have to balance your gearing for your factors. Do you do a lot of hwy riding and want a lower cruise RPM - does the engine have enough power on the hwy if you do? Are you a large person and need more torque? What are your engine's characteristics - will you be dropping the RPMs into a flat spot in the power curve if you alter the gearing? There's no one right answer for everyone. You need to consider all the factors that you personally are working with.

As far as sprockets go, I was impressed with the Sunstar rear sprocket my son just bought for his Ninja. It's black, made in Japan, and was reasonably priced.


Jay V
The one tooth more on the front sprocket of my 650 should be perfect 4 my riding.....Lot of 55-65 highway.
Then down the road i'll have plenty of time to decide if more changes need to be made with these lifetime sprockets i'll be buying.
NNnnn that 16,000 pound smartchain should also last a long long time with cleaning n lubing....
:thumb::thumb::thumb:
Dropping 500 rpms on highways should help quite a bit on a 650....:dance::dance:








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one problem you might face when going up teeth front and back sprocket is your countershaft to rear axle distance might become shorter than adjustments will allow meaning you will need longer chain.also if going down teeth on front and back sprocket means shorter chain.thats why going up front sprocket and down back sprocket is prefered and also when going down front sprocket to go up on back sprocket.gearingcommander.com helps when choosing best combinations.
 

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but if you want lower rpm go 1 tooth more on front sprocket, its cheaper than back sprocket and your rpm will drop to 4578rpm at 70mph in 6th.its a 5.55% drop in rpm so no need to recalibrate speedo any more than that and you will also need a speedo healer.
 
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