New Ninja 300 and max cs sprocket enquiry

joyspring · March 14th, 2013, 11:19 AM

hello everyone,

I'm the new owner of a new white Ninja 300! It will keep my 250R racebike company in the carport ;-) and I actually traded my 2010 R1 for it.

Have got a list of obligatory upgrades to work on while (patiently) breaking the motor in but updating the final drive ratio is a priority... apparently it is very popular to do so!

And having searched the threads, I've not found an answer to a simple enquiry:

What is the largest countershaft sprocket that will fit in the Ninja 300? I know that a 15T works but will a 16T or even 17T fit?

While I realize that's a major increase in final drive ratio, I'd like to point out that I weigh less than 42 kg (about 95 lbs.) and bumping the ratio on my 250R over 15% worked fine when it was a streetbike.

many thanks in advance!

Robert

csmith12 · March 14th, 2013, 11:38 AM

No clue about your sprock question but 95lbs!!!! Wow! You're like jokey sized.

joyspring · March 14th, 2013, 12:09 PM

Quote:

Originally Posted by csmith12

No clue about your sprock question but 95lbs!!!! Wow! You're like jokey sized.

Lol! My weight varies between 42-47 kg (95-105 lbs) but I'm at the low end currently. FWIW, I'm 155 cm (5' 1") tall so that goes a long way in explaining the weight ;-)

Robert

choneofakind · March 14th, 2013, 12:41 PM

Another member here (I forget who...

) went 15/39 on his 300 and said it still felt fine.

Correct me if I'm wrong here, but I believe the speedo on the 300 is not based on the front wheel speed like on the 250R. Members have reported that doing 15/42 on the 300 makes their speedometer nearly perfect. Going with taller gearing would make your speedo read low. I'd rather have it read high than low.

joyspring · March 14th, 2013, 01:11 PM

Quote:

Originally Posted by choneofakind

Another member here (I forget who...

) went 15/39 on his 300 and said it still felt fine.

Correct me if I'm wrong here, but I believe the speedo on the 300 is not based on the front wheel speed like on the 250R. Members have reported that doing 15/42 on the 300 makes their speedometer nearly perfect. Going with taller gearing would make your speedo read low. I'd rather have it read high than low.

Good to hear 15/39 (+15.4%) works fine. I see that JT steel JTR486 is available in 38T as well which would result in +18.4% with a 15T CS sprocket.

I realize that the speedo reading will be affected but I'll be fine once I've compared it to a known-accurate source.

Still would like to know whether a 16T will fit though...

many thanks!

Alex · March 14th, 2013, 01:17 PM

/moved to 300 tech area

felo · March 14th, 2013, 02:15 PM

Quote:

Originally Posted by joyspring

Good to hear 15/39 (+15.4%) works fine. I see that JT steel JTR486 is available in 38T as well which would result in +18.4% with a 15T CS sprocket.

I realize that the speedo reading will be affected but I'll be fine once I've compared it to a known-accurate source.

Still would like to know whether a 16T will fit though...

many thanks!

i believe it would fit like in a 250, you might want to modify the sprocket cover a little

S1att3r · March 14th, 2013, 05:21 PM

I'm 5' 7'' and weigh between 95-100 and 15/42 work perfectly for me. P.S. unlike most with the 15 tooth mine is +2 instead of dead on.

felo · March 14th, 2013, 05:30 PM

what is the stock rear one? 42?

allanoue · March 16th, 2013, 03:32 AM

You need to update your profile

joyspring · March 16th, 2013, 04:26 AM

Quote:

Originally Posted by allanoue

You need to update your profile

Thanks for reminding me... done!

Added the Ninja 300 and removed the bikes I've traded in or am selling...

joyspring · March 29th, 2013, 02:00 PM

hello again,

Just an update on the Ninja 300 countershaft sprocket size issue:

A 16T will not fit.

I'm running the 15T without the sprocket cover as I still have to cut it so the reversed clevis will clear (I'm doing GP shift).

I'm still breaking in the bike and have got 75 miles to go

15/38 is +18% and still pulls fine from first gear, at least with a 100 lbs. rider. The chain is short enough that this works though the adjusters are less than 3 notches from the back of the swingarm.

Will offer another report once I can wind it out past 6 krpm...

Robert

psych0hans · April 10th, 2013, 04:59 AM

I'm planning on buying a 15t sprocket, can anyone confirm what pitch I would need for my stock chain?

joyspring · April 18th, 2013, 02:58 PM

hello everyone,

Final update and report: 15/38 works great, at least for a 100 lbs. rider ;-) Top speed is still achieved in fifth gear (which is the same as sixth with a normal final drive ratio) because of the power deficit but highway cruising is far more comfortable at +18%.

I used a product (`Speedo Healer') to correct the speed sensor signal from the countershaft sprocket to compensate for the revised final drive ratio. It isn't inexpensive (~130 USD w/ cable) but is certainly convenient.

@psych0hans - our bikes use a standard 520 chain which has a 5/8" pitch.

-Robert

JYPY650 · September 28th, 2013, 07:17 AM

Quote:

Originally Posted by joyspring

Good to hear 15/39 (+15.4%) works fine. I see that JT steel JTR486 is available in 38T as well which would result in +18.4% with a 15T CS sprocket.

I realize that the speedo reading will be affected but I'll be fine once I've compared it to a known-accurate source.

Still would like to know whether a 16T will fit though...

many thanks!

I rode a 15/39 and is just fine less shifting in town you can ride in 4th and more than 1000 rpm less on hyway the new 5 th 7000 rpm at 100km/h is the same as the old 6 th

March 14th, 2013, 11:19 AM	#1
joyspring swell dude extraordinaire Name: Robert Location: Long Beach, CA Join Date: May 2011 Motorcycle(s): '13 Ninja 300 (white, streetbike), '08 Ninja 250R (yellow, racebike), '97 Yamaha TZ125 4JT Posts: 14	New Ninja 300 and max cs sprocket enquiry hello everyone, I'm the new owner of a new white Ninja 300! It will keep my 250R racebike company in the carport ;-) and I actually traded my 2010 R1 for it. Have got a list of obligatory upgrades to work on while (patiently) breaking the motor in but updating the final drive ratio is a priority... apparently it is very popular to do so! And having searched the threads, I've not found an answer to a simple enquiry: What is the largest countershaft sprocket that will fit in the Ninja 300? I know that a 15T works but will a 16T or even 17T fit? While I realize that's a major increase in final drive ratio, I'd like to point out that I weigh less than 42 kg (about 95 lbs.) and bumping the ratio on my 250R over 15% worked fine when it was a streetbike. many thanks in advance! Robert

March 14th, 2013, 11:38 AM	#2
csmith12 The Corner Whisperer Name: Chris (aka Reactor) Location: Northern KY Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much. MOTY 2015, MOTM - Nov '12, Nov '13	No clue about your sprock question but 95lbs!!!! Wow! You're like jokey sized. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

March 14th, 2013, 01:17 PM	#6
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	/moved to 300 tech area __________________________________________________ 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)

March 14th, 2013, 05:21 PM	#8
S1att3r ninjette.org member Name: Raygan Location: North East Texas Join Date: Oct 2012 Motorcycle(s): White 2013 Ninja 300(Storm), Silver 2003 Fjr1300 Posts: 173	I'm 5' 7'' and weigh between 95-100 and 15/42 work perfectly for me. P.S. unlike most with the 15 tooth mine is +2 instead of dead on. __________________________________________________ ATGATT For all I know, women who ride motorcycles are all man-hating dominatrix's. It was like a mild panic attack!

April 10th, 2013, 04:59 AM	#13
psych0hans ninjette.org certified postwhore Name: Hansveer Location: Bombay, India Join Date: Jan 2012 Motorcycle(s): Ninja 250r - Track whore, Ninja 300 - SOLD, KTM RC390 - Orange Hulk, Ducati 899 Panigale - Red Devil. Posts: A lot.	I'm planning on buying a 15t sprocket, can anyone confirm what pitch I would need for my stock chain? __________________________________________________ GETTING BACK INTO RIDING? Read this.

March 14th, 2013, 12:41 PM	#4
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	Another member here (I forget who... ) went 15/39 on his 300 and said it still felt fine. Correct me if I'm wrong here, but I believe the speedo on the 300 is not based on the front wheel speed like on the 250R. Members have reported that doing 15/42 on the 300 makes their speedometer nearly perfect. Going with taller gearing would make your speedo read low. I'd rather have it read high than low.

March 14th, 2013, 05:30 PM	#9
felo ninjette.org member Name: Carlos Location: Puerto Rico Join Date: Jan 2013 Motorcycle(s): Ninja 300R Posts: 181	what is the stock rear one? 42?

March 16th, 2013, 03:32 AM	#10
allanoue ninjette.org certified postwhore Name: Al Location: York, Pa Join Date: Dec 2012 Motorcycle(s): 2013 Ninja 300..............2008 Ninja 500-sold...2009 Ninja 250-Crashed Posts: Too much. MOTM - Sep '14	You need to update your profile

March 29th, 2013, 02:00 PM	#12
joyspring swell dude extraordinaire Name: Robert Location: Long Beach, CA Join Date: May 2011 Motorcycle(s): '13 Ninja 300 (white, streetbike), '08 Ninja 250R (yellow, racebike), '97 Yamaha TZ125 4JT Posts: 14	hello again, Just an update on the Ninja 300 countershaft sprocket size issue: A 16T will not fit. I'm running the 15T without the sprocket cover as I still have to cut it so the reversed clevis will clear (I'm doing GP shift). I'm still breaking in the bike and have got 75 miles to go 15/38 is +18% and still pulls fine from first gear, at least with a 100 lbs. rider. The chain is short enough that this works though the adjusters are less than 3 notches from the back of the swingarm. Will offer another report once I can wind it out past 6 krpm... Robert

April 18th, 2013, 02:58 PM	#14
joyspring swell dude extraordinaire Name: Robert Location: Long Beach, CA Join Date: May 2011 Motorcycle(s): '13 Ninja 300 (white, streetbike), '08 Ninja 250R (yellow, racebike), '97 Yamaha TZ125 4JT Posts: 14	hello everyone, Final update and report: 15/38 works great, at least for a 100 lbs. rider ;-) Top speed is still achieved in fifth gear (which is the same as sixth with a normal final drive ratio) because of the power deficit but highway cruising is far more comfortable at +18%. I used a product (`Speedo Healer') to correct the speed sensor signal from the countershaft sprocket to compensate for the revised final drive ratio. It isn't inexpensive (~130 USD w/ cable) but is certainly convenient. @psych0hans - our bikes use a standard 520 chain which has a 5/8" pitch. -Robert