November 9th, 2018, 11:49 AM | #1 |
ninjette.org member
Name: David
Location: Mexico
Join Date: Sep 2017 Motorcycle(s): 2010 Kawasaki Ninja 250R, 99' Suzuki Katana 600 (RIP) Posts: 95
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A good front chain sprocket
Hi guys i have a problem, danno told me to get a JT front sprocket, but the sprocket don't fit on the bike, also somebody know what is the Stock sprocket teeth? and how many sprocket i can reduce or increase?
Because if bought the rear sprocket and chain, the rear sprocket is 45T and the chain is a 520, that is why i was asking the stock front sprocket teeth, and how many teeth i can reduce or increase, because i don't have more money to buy the rear and front sprocket. My idea is to reduce RPM maybe 500 rpm from the stock |
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November 9th, 2018, 12:37 PM | #2 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
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First off, I'd contact JT and find out why it doesn't fit. I have a JT on my 250.
There's a good article on sprocket ratios here: https://faq.ninja250.org/wiki/I_want...nge_my_gearing |
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November 9th, 2018, 12:54 PM | #3 | |
ninjette.org member
Name: David
Location: Mexico
Join Date: Sep 2017 Motorcycle(s): 2010 Kawasaki Ninja 250R, 99' Suzuki Katana 600 (RIP) Posts: 95
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Quote:
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November 9th, 2018, 01:48 PM | #4 |
Rev Limiter
Name: Jay
Location: WI
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Hmmm...danno is usually right.
Adding 1T to the countershaft sprocket typically drops RPMs by close to 500. Stock the front is 14T and rear is 45T. Going to 15/45 will drop the revs, but cost you on acceleration. |
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November 9th, 2018, 02:02 PM | #5 |
ninjette.org member
Name: David
Location: Mexico
Join Date: Sep 2017 Motorcycle(s): 2010 Kawasaki Ninja 250R, 99' Suzuki Katana 600 (RIP) Posts: 95
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i know i have to open the throttle a little more, but i want to ride on highway and i don't want the bike go to rev, because i have a "chinese" exhaust akrapovic "replica", and int 9k rpm hear a little forced :/
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November 10th, 2018, 02:29 AM | #6 |
"a legend in my own mind"
Name: maverick9611
Location: Augusta,Georgia
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the ninja 250 engine powerband is meant/designed to run at high rpm. why would you want to change this? i have el cheapo exhaust on both red and green and always run 9000- 12500 rpm. the engine can take it. the stock gearing ratio is not that bad. 70-80 mph around 9000-10500 rpm. just my opinion. is ya want lower revs buy something else.
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November 10th, 2018, 02:13 PM | #7 | |
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Name: AKA JacRyann
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Quote:
Their chart shows it fitting 2008-2009 EX250J. Not sure why not later years as 2008-2012 is the same. There's also this one which shows as fitting all new-gen 2008-2012: https://www.ebay.com/itm/362446119559 Post picture of what part doesn't fit and why. Might need an extra washer. Last futzed with by DannoXYZ; November 10th, 2018 at 05:17 PM. |
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November 11th, 2018, 12:57 PM | #8 |
The Corner Whisperer
Name: Chris (aka Reactor)
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Depending on the make, not all 16t sprockets fit on our 250's. Some need a washer, some need to be flipped "engine side" and others will not fit at all.
Why not just run a 15 in the front and something else in the rear to get the same ratio and keep life simple? Or am I missing something?
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November 11th, 2018, 08:25 PM | #9 |
Guy Who Enjoys Riding
Name: Jim
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I like the lower than stock sprocket ratio on my 250. If you like the stock setup, more power to you. As long as you can downshift and get the revs up, the lower ratio won't hurt acceleration. It's really off the line that it changes.
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November 12th, 2018, 09:29 AM | #10 |
ninjette.org member
Name: ar
Location: esco
Join Date: Apr 2016 Motorcycle(s): ex250 Posts: 77
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I ran a 16 tooth for a few miles. c/sprocket cover wouldn't fit correctly, so left it off. finally changed rear sprocket and went to 15t c/sprocket.
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November 18th, 2018, 12:18 AM | #11 | |
ninjette.org member
Name: David
Location: Mexico
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Quote:
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November 18th, 2018, 02:25 PM | #12 |
ninjette.org certified postwhore
Name: AKA JacRyann
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Did you have chain ends connected before installing sprocket cover?
Did you have chain tension adjusted at swing-arm before installing sprocket cover? Take and post photo of just 16t sprocket installed. Take and post photo of chain wrapped around 16th sprocket. Take and post photo of chain wrapped around 16th sprocket after chain-ends have been connected. Take and post photo of chain wrapped around 16th sprocket after chain-tension have been adjusted at swing-arm. |
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November 19th, 2018, 01:51 PM | #13 |
ninjette.org member
Name: Mauricio
Location: Mexico City
Join Date: Aug 2015 Motorcycle(s): 250R Posts: 84
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Is the sprocket free in the engine side??
I think if it is placed inverted it will touch the engine (i hope I am explaining my self) Attached is the image with the sprockets I am using now in case de part numbers help. 15T in the front with no problem. Hopefully you find a solution for your 16T Regards Last futzed with by MauR; November 19th, 2018 at 01:55 PM. Reason: added a comment |
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