January 9th, 2010, 04:03 PM | #1 |
ninjette.org member
Name: Jessy
Location: Orlando
Join Date: Jan 2010 Motorcycle(s): 2009 Kawasaki Ninja 250r Posts: 19
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Need sprocket info
How many teeth come stock on a front sprocket for the 09 250r?
I was told to buy a +1 sprocket for the front of my bike, I went to cycle gear and they told me that stock was 16 teeth and a 17 didnt exist. Is this information correct? Ive seen a couple places that say OEM is 15 teeth. Anyone know for sure? Thanks!
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January 9th, 2010, 04:27 PM | #2 |
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Stock is 14 teeth, it's a common mod to bump it up to 15 teeth to lower revs a smidge on the highway. I don't think a 16-tooth will fit without modifications to the housing; if you want to go any taller it's a matter of going up to 15 in front, then coming down from the 45 in back. There's been at least one poster here that runs a 15/41 setup.
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January 9th, 2010, 04:28 PM | #3 |
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Stock is 14 teeth. One of the first and easiest mods is puting a 15t front sprocket. Makes highway riding much easier on the engine and does not affect acceleration much.
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January 9th, 2010, 04:35 PM | #4 |
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Name: Seth
Location: Maine
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Here's the one I ordered. It arrived in about 4 days. I can't tell you anything about the difference as the bike is tucked away in storage still. http://www.denniskirk.com/jsp/produc...d=8098515&mmy=
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January 10th, 2010, 06:25 AM | #5 |
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Name: Trip
Location: Deland FL
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JessyBee, CG is wrong but they should be able to get the right one for you. JT makes the sprocket and it is a 15tooth. What changing it did for me? It lowered the RPM's while on the highway, so instead of screaming at 9000 RPM's it does so at about 8000. Some say it also makes shifting a little less as you get a little more out of all the gears.
Anyway, if CG can't get it, order it at the link above! |
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January 10th, 2010, 08:57 AM | #6 |
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January 10th, 2010, 12:21 PM | #7 |
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It will lower revs, but not by 1000 rpm at highway speeds. Going from a 14 tooth to a 15 tooth changes the gearing by 14/15ths, so if the engine was turning 9000 RPM before at a certain speed, now it will turn 8400 RPM instead. There's a great site out there, www.gearingcommander.com, that lets you pick the type of bike and then play around with all of the ratios as much as you want to see the effects.
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January 10th, 2010, 01:29 PM | #8 | |
ninjette.org member
Name: Trip
Location: Deland FL
Join Date: Jan 2010 Motorcycle(s): 2009 Ninja 250 Posts: 17
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Quote:
I will read what you posted Snake, my goal was to lower the RPM's as all she does is highway riding. My girlfriends commute is about 120 miles a day-again, ALL higway. JesseBee, my intention was not to highjack your thread....but thanks for the info guys! |
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January 10th, 2010, 01:33 PM | #9 |
Join Date: Nov 2008 Posts: Too much.
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some/a lot of 250s had/have tach/ignitor issues that cause them to read wrong.
regardless of what the tach is reading, a larger front sprocket will lower the engine rpm at a given speed in the same gear. |
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January 10th, 2010, 01:35 PM | #10 |
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Name: Trip
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January 10th, 2010, 01:54 PM | #11 |
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Tripyn you may want to check this thread out dealing with the tach issue and power loss.
http://www.ninjette.org/forums/showthread.php?t=21043 |
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January 11th, 2010, 05:55 AM | #12 |
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Name: Remy
Location: Moncton
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I fitted a 16 tooth but removed it because the chain was too tight to my taste. I settled with a 15 tooth, for the money, it's a good upgrade, not alot of power lost and a little higher gearing. The highway limits here are 110 KMH and following more or less the speed I almost dropped 1000 rpm, which is good, a little less busy.
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January 11th, 2010, 08:27 AM | #13 |
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Name: Jessy
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Thanks, I think Ive settled on a 15. :]
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January 11th, 2010, 08:42 AM | #14 |
ninjette.org member
Name: Jessy
Location: Orlando
Join Date: Jan 2010 Motorcycle(s): 2009 Kawasaki Ninja 250r Posts: 19
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Rayme,
any tips oyu can give me on switching it out? Im gonna try it myself. Do I need a center stand or can it be done with out it? Ive never done any work on my bike before, my first oil change is due and Im gonna do it myself. Am I taking on too much by changing the sprocket myself? Any tips would be greatly appreciated. Thanks!
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January 11th, 2010, 09:13 AM | #15 |
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Name: Greg
Location: Bakersfield, CA
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for the 15T....you just put it on and away you go....right? Do you need to shim it or align it?
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January 11th, 2010, 03:17 PM | #16 | |
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Quote:
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January 12th, 2010, 02:15 PM | #17 | |
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Quote:
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January 14th, 2010, 02:00 PM | #18 |
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I am thinking about changing the stock 14T sprocket to a 15T. The Dennis Kirk catalog recommends changing out both sprockets and chain. That would come to $172.00US. My bike has 8500 miles on the clock and the sprockets and chain show no visible signs of wear. I would suspect that I could probably get away with just changing out the front sprocket with no bad effects. I know that on a bicycle, if you put a new chain on some worn chainrings that shifting is really compromised. The folks on this forum who changed to a 15---did you also replace the rear sprocket and chain?
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January 14th, 2010, 02:17 PM | #19 |
Join Date: Nov 2008 Posts: Too much.
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I would say to just change the front sprocket for now just to get a feel of the changes it makes. If the chain and rear sprocket are worn enough to affect the front, you will be in for a new set anyway in the future.
In the meantime, play with gearing combos to suit your particular needs.... go up on the front... you may want to drop a few in the rear, too, if you do a lot of long distance travel on the bike. Once you find a combination that works for you, then go out and buy a set of sprockets and a new chain, which I suspect will be awhile. |
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January 15th, 2010, 10:14 AM | #20 | |
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Quote:
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January 15th, 2010, 11:17 AM | #21 |
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If there are no visible signs of wear on the front sprocket, I wouldn't worry about changing it out as a preventative measure. It's unlikely wear on the chain will be greatly accelerated. Our ninjettes are quite easy on chains and sprockets, for reasons that we're all familiar with.
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January 15th, 2010, 11:33 AM | #22 |
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Thank you all for the good advice. Will order a 15T and take it from there.
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