New sprockets

min nin · October 15th, 2009, 03:08 PM

I put new sprockets on my bike today.

Put 43-15. the bike only has 300 miles so i left the old chain on there.

This gave me 1000 rpm lower in top gear@ whatever speed. Its like having another gear, and it only took an hour

Snake · October 15th, 2009, 03:12 PM

I put a 15T on the front and have enjoyed the "extra" gear ever since. Very good mod.

Alex · October 15th, 2009, 03:50 PM

Quote:

Originally Posted by min nin

This gave me 1000 rpm lower in top gear@ whatever speed. Its like having another gear, and it only took an hour

Well, not exactly. The new sprockets made your gearing 12.1% taller no matter what speed you're going. (15/14 * 45/43). But 1000 rpm difference is in the ball park for highway speeds; if you were turning around 8500 rpm before, it would be very close to 7500 rpm after the swap. (But if you were at half the speed, and only turning 4250 in top gear, it would only drop 500 rpm after the swap). Conversely, if you were up near redline before, the gearing switch would change 13k down to 11.6k or so, well over a 1000 RPM difference.

min nin · October 15th, 2009, 04:00 PM

REDLINE? omg I only have 300 miles on it.

The tach is hard to read at night, could be off a little.

rockNroll · October 16th, 2009, 06:14 AM

Quote:

Originally Posted by min nin

REDLINE? omg I only have 300 miles on it.

The tach is hard to read at night, could be off a little.

I was slapping redline all day long in the mountains one saturday. The day started with about 50 miles on the odo and ended with about 350. Don't be afraid... go ahead and goose that girl

nate-bama · October 16th, 2009, 01:34 PM

i have the 15 and would like to go down in the back too..but it's so hilly around here i'm not sure yet.

iceman.kcmo · October 16th, 2009, 03:04 PM

How is the power? i like how zippy it is right now, but would like a little better milage. I mostly ride mine to work, which is mostly highway.

Snake · October 17th, 2009, 08:16 AM

Quote:

Originally Posted by iceman.kcmo

How is the power? i like how zippy it is right now, but would like a little better milage. I mostly ride mine to work, which is mostly highway.

The power is not adversly affected. I still have plenty of passing power.

M · October 17th, 2009, 06:37 PM

I have similar results. With a 15/44 setup, my RPMs at a true 80mph dropped from about 10,200 to 9,100. Also, first gear is a bit more usable.

andrewexd · October 17th, 2009, 07:36 PM

does changing sprockets give you inaccurate miles on the odometer ? I've seen a few CL ads that say this.

Alex · October 17th, 2009, 08:19 PM

On most bikes yes, on the ninjette no. Our speedometer/odometer is driven off a sprocket on the front tire. Changing gearing from the motor to the driven wheel has no effect on how often the front tire turns compared to the engine.

Most modern motorcycles instead get the speedo/odo drive off of the transmission output, and in that case gearing changes do directly affect the accuracy of the gauges.

andrewexd · October 17th, 2009, 08:23 PM

Quote:

Originally Posted by Alex

On most bikes yes, on the ninjette no. Our speedometer/odometer is driven off a sprocket on the front tire. Changing gearing from the motor to the driven wheel has no effect on how often the front tire turns compared to the engine.

Most modern motorcycles instead get the speedo/odo drive off of the transmission output, and in that case gearing changes do directly affect the accuracy of the gauges.

I see, thanks

min nin · October 18th, 2009, 07:17 PM

I changed sprockets to get lower engine speed, better mileage, and maybe longer engine life. If I get a little less power, it's not a problem.

I live in s.w. florida, so no fun hills or even roads with curves in them.

Snake · October 19th, 2009, 07:11 AM

Hills are not a problem for me. All you have to do is downshift and you have plenty of pulling power.

gistmarrs · October 19th, 2009, 01:11 PM

I put on a 16T front just after I bought the bike. It made for much lower RPM at highway speeds. After swapping out to the stock tires with GT-501's, I put the 14T back on. The combination of the taller tires and larger sprocket, wasn't great. I had to feather the clutch way to much on take off.

Grn99Kawi · October 19th, 2009, 02:21 PM

I plan on swapping a 15T on mine in the spring. (keeping the 45 out back)

bobaab · October 19th, 2009, 04:29 PM

Quote:

Originally Posted by Grn99Kawi

I plan on swapping a 15T on mine in the spring. (keeping the 45 out back)

That's what I did earlier this year and love it. I commuted a lot with my bike so going at a lower RPM at the same speed made my commute much more comfortable. With people going 70mph in the mornings, it sucked not wanting to keep up.

It still accelerates fine, but initially in first gear, the bike feels a tad slower. So...I just rev a bit more!

Grn99Kawi · October 27th, 2009, 06:54 PM

I know that this is a subjective question, but how much slower does it feel with the 15/45 setup? Is it noticeable? Did you have to raise your launch slip rpm? Do you find that it needs noticeably more throttle to get moving?

Thanks,
Adam

bobaab · October 27th, 2009, 06:58 PM

It's noticeable, but it's really not bad unless you're accelerating from a stop. Once you get going, it feels just the same. Once you get used to how it feels, you will probably barely remember how it used to feel with a 14T sprocket up front!

CZroe · October 28th, 2009, 01:15 AM

Quote:

Originally Posted by rockNroll

I was slapping redline all day long in the mountains one saturday. The day started with about 50 miles on the odo and ended with about 350. Don't be afraid... go ahead and goose that girl

Even the "hard" break-in methods don't suggest doing that without a few oil changes thrown in there!

rockNroll · October 28th, 2009, 01:22 PM

Quote:

Originally Posted by CZroe

Even the "hard" break-in methods don't suggest doing that without a few oil changes thrown in there!

Did you read what I quoted in that post? It was about him worrying about redlining with only 300 miles on the bike, nothing about oil changes. If it bothers you wondering, I drained and refilled the oil before that ride (no new filter).

kawaninja09 · May 28th, 2013, 07:48 AM

I read this add to see if i could solve a problem im having. I swapped the sprocket to 15t in the front and I was riding this weekend behind my buddy in his car and i told him to do the speed limit bc i thought my speedometer was off and it wasnt the weekend to be speeding so i followed him and it said i was doing 80 to keep up with hime but when we got to the house he said he put it on cruise at 65 and nothing more so why would i be off by like 15 mph???

October 15th, 2009, 03:08 PM	#1
min nin ninjette.org member Name: terry Location: SW fla Join Date: Sep 2009 Motorcycle(s): 2007 250r Posts: 94	New sprockets I put new sprockets on my bike today. Put 43-15. the bike only has 300 miles so i left the old chain on there. This gave me 1000 rpm lower in top gear@ whatever speed. Its like having another gear, and it only took an hour

October 16th, 2009, 01:34 PM	#6
nate-bama North Alabama Mtn. ryder Name: Nate Location: Alabama Join Date: May 2009 Motorcycle(s): 2006 Posts: 537	i have the 15 and would like to go down in the back too..but it's so hilly around here i'm not sure yet. __________________________________________________ QTRltrPWR

October 17th, 2009, 08:19 PM	#11
Alex ninjette.org dude Name: 1 guess :-) Location: SF Bay Area Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much. Blog Entries: 7	On most bikes yes, on the ninjette no. Our speedometer/odometer is driven off a sprocket on the front tire. Changing gearing from the motor to the driven wheel has no effect on how often the front tire turns compared to the engine. Most modern motorcycles instead get the speedo/odo drive off of the transmission output, and in that case gearing changes do directly affect the accuracy of the gauges. __________________________________________________ Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)

October 19th, 2009, 02:21 PM	#16
Grn99Kawi ninjette.org sage Name: A Location: Long Island, NY Join Date: Apr 2009 Motorcycle(s): 2000 Honda CBR600F4 (sold) 1999 Ninja 250 (sold) Posts: 586	I plan on swapping a 15T on mine in the spring. (keeping the 45 out back) __________________________________________________ 2000 Honda CBR600F4 Silver and Red 1999 Kawi Racing Green Ninja 250 sold

October 27th, 2009, 06:54 PM	#18
Grn99Kawi ninjette.org sage Name: A Location: Long Island, NY Join Date: Apr 2009 Motorcycle(s): 2000 Honda CBR600F4 (sold) 1999 Ninja 250 (sold) Posts: 586	I know that this is a subjective question, but how much slower does it feel with the 15/45 setup? Is it noticeable? Did you have to raise your launch slip rpm? Do you find that it needs noticeably more throttle to get moving? Thanks, Adam __________________________________________________ 2000 Honda CBR600F4 Silver and Red 1999 Kawi Racing Green Ninja 250 sold

October 15th, 2009, 03:12 PM	#2
Snake ninjette.org certified postwhore Name: Rick Location: Alexandria, Louisiana Join Date: Jan 2009 Motorcycle(s): 05 Blue Ninja 250 Posts: Too much. MOTY - 2017, MOTM - Jan '19, Oct '16, May '14	I put a 15T on the front and have enjoyed the "extra" gear ever since. Very good mod.

October 15th, 2009, 04:00 PM	#4
min nin ninjette.org member Name: terry Location: SW fla Join Date: Sep 2009 Motorcycle(s): 2007 250r Posts: 94	REDLINE? omg I only have 300 miles on it. The tach is hard to read at night, could be off a little.

October 16th, 2009, 03:04 PM	#7
iceman.kcmo ninjette.org member Name: Steve Location: Kansas city Join Date: Aug 2009 Motorcycle(s): 94 Ex250 Posts: 101	How is the power? i like how zippy it is right now, but would like a little better milage. I mostly ride mine to work, which is mostly highway.

October 17th, 2009, 06:37 PM	#9
M ninjette.org member Name: M Location: Oklahoma Join Date: Jun 2009 Motorcycle(s): Ninja 250 x2, Ninja 650R Posts: 165	I have similar results. With a 15/44 setup, my RPMs at a true 80mph dropped from about 10,200 to 9,100. Also, first gear is a bit more usable.

October 17th, 2009, 07:36 PM	#10
andrewexd ninjette.org guru Name: Andrew Location: LA Join Date: Aug 2009 Motorcycle(s): 07 GSXR600 (N250 sold :( ) Posts: 415	does changing sprockets give you inaccurate miles on the odometer ? I've seen a few CL ads that say this.

October 18th, 2009, 07:17 PM	#13
min nin ninjette.org member Name: terry Location: SW fla Join Date: Sep 2009 Motorcycle(s): 2007 250r Posts: 94	I changed sprockets to get lower engine speed, better mileage, and maybe longer engine life. If I get a little less power, it's not a problem. I live in s.w. florida, so no fun hills or even roads with curves in them.

October 19th, 2009, 07:11 AM	#14
Snake ninjette.org certified postwhore Name: Rick Location: Alexandria, Louisiana Join Date: Jan 2009 Motorcycle(s): 05 Blue Ninja 250 Posts: Too much. MOTY - 2017, MOTM - Jan '19, Oct '16, May '14	Hills are not a problem for me. All you have to do is downshift and you have plenty of pulling power.

October 19th, 2009, 01:11 PM	#15
gistmarrs ninjette.org newbie Name: Marrs Location: Tulare Join Date: Aug 2009 Motorcycle(s): '07 250 Posts: 4	I put on a 16T front just after I bought the bike. It made for much lower RPM at highway speeds. After swapping out to the stock tires with GT-501's, I put the 14T back on. The combination of the taller tires and larger sprocket, wasn't great. I had to feather the clutch way to much on take off.

October 27th, 2009, 06:58 PM	#19
bobaab ninjette.org member Name: Bob Location: Park Ridge, IL Join Date: Jul 2009 Motorcycle(s): 2001 Kawasaki Ninja 250 Posts: 74	It's noticeable, but it's really not bad unless you're accelerating from a stop. Once you get going, it feels just the same. Once you get used to how it feels, you will probably barely remember how it used to feel with a 14T sprocket up front!

May 28th, 2013, 07:48 AM	#22
kawaninja09 ninjette.org member Name: derek Location: columbus, oh Join Date: Nov 2012 Motorcycle(s): 09 250r ninja Posts: 67	I read this add to see if i could solve a problem im having. I swapped the sprocket to 15t in the front and I was riding this weekend behind my buddy in his car and i told him to do the speed limit bc i thought my speedometer was off and it wasnt the weekend to be speeding so i followed him and it said i was doing 80 to keep up with hime but when we got to the house he said he put it on cruise at 65 and nothing more so why would i be off by like 15 mph???

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