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Discussion Starter · #1 ·
Well, changed the factory front and rear sprockets for a 15t front and 43t rear, it's like a whole different motorcycle. I can go 23mph in 1st gear at 7,000 RPMs and 44 MPH on second gear.
So I went from a 3.29 ratio to a 2.87 ratio and didn't have to change the number of links on the chain as the ratio for old and new came to 112 links for both - that's awesome.
It did lose 14.6% torque but gained 14.6% more speed which is fine by me because I'm not going to be doing any serious off-roading, this is for going through gravel and dirt roads and light trails on national parks and state parks.
At 70 MPH it's running at 7,800 RPMs where before I was spinning at 9,000 RPMs, so my fuel mileage will be much better and the engine wear will be much less.
I've read on the threads that older model would get a check engine light and ABS light when changing to this gear ratio but mine is a 2021 and did not have that issue. I went on a 5 mile ride and neither the check engine nor ABS lights ever came on.
I put a GPS speedometer app on my phone to check speedometer accuracy and it's 4 MPH off. At an indicated 60 mph it's actually 56mph per GPS and at an indicated 70 mph it's actually 66 mph per GPS. I can definitely live with that.
I'm extremely happy with its performance now. Kawasaki advertises it as an adventure tourer but they geared it more for offroad and light touring. I simply changed the gearing for great touring and light off-roading - that fits my use case perfectly now.
Thanks
 

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Well, changed the factory front and rear sprockets for a 15t front and 43t rear, it's like a whole different motorcycle. I can go 23mph in 1st gear at 7,000 RPMs and 44 MPH on second gear.
So I went from a 3.29 ratio to a 2.87 ratio and didn't have to change the number of links on the chain as the ratio for old and new came to 112 links for both - that's awesome.
It did lose 14.6% torque but gained 14.6% more speed which is fine by me because I'm not going to be doing any serious off-roading, this is for going through gravel and dirt roads and light trails on national parks and state parks.
At 70 MPH it's running at 7,800 RPMs where before I was spinning at 9,000 RPMs, so my fuel mileage will be much better and the engine wear will be much less.
I've read on the threads that older model would get a check engine light and ABS light when changing to this gear ratio but mine is a 2021 and did not have that issue. I went on a 5 mile ride and neither the check engine nor ABS lights ever came on.
I put a GPS speedometer app on my phone to check speedometer accuracy and it's 4 MPH off. At an indicated 60 mph it's actually 56mph per GPS and at an indicated 70 mph it's actually 66 mph per GPS. I can definitely live with that.
I'm extremely happy with its performance now. Kawasaki advertises it as an adventure tourer but they geared it more for offroad and light touring. I simply changed the gearing for great touring and light off-roading - that fits my use case perfectly now.
Thanks
Have you been tracking fuel mileage before the change? I would be interested to know what the actuals are. Just because RPMs are lower at a certain speed doesn't necessarily equate to better fuel economy. Sometimes it take more fuel to maintain a lower RPM at a desired speed because of the power band and aerodynamic drag. Many of the motorcycles with 6 speeds actually attain their top speed in 5th gear.

Don't forget to compensate for the odometer change. Use the GPS miles instead.
 

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That is quite a change in gearing. Most would just go with either sprocket change but not both. Are you sure about your mph & rpms? They both seem high to me. On my stock geared 08 Versys 650 @ 60mph on the gps I'm turning about 4800 rpm in 6th gear. 75 -80 mph is in the 7000 rpm area. The higher gearing in real world driving hills/mountains and head winds will cause you to shift down a gear or two. You will loose 6th and maybe even 5th in some situations. Keep us posted as to how it works.
 

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Discussion Starter · #4 ·
That is quite a change in gearing. Most would just go with either sprocket change but not both. Are you sure about your mph & rpms? They both seem high to me. On my stock geared 08 Versys 650 @ 60mph on the gps I'm turning about 4800 rpm in 6th gear. 75 -80 mph is in the 7000 rpm area. The higher gearing in real world driving hills/mountains and head winds will cause you to shift down a gear or two. You will loose 6th and maybe even 5th in some situations. Keep us posted as to how it works.
I'm quite sure, the numbers are accurate. That is what the tach says and the speed reported was using GPS and looking at RPMs at that speed. Gearing is now perfect, max torque power band of the engine is fairly flat from 3,600 RPMs to 11,500 RPMs as measured by DynoJet test. So I'm quite happy with the performance now as I have full use of max torque through most of the useful power band.
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Discussion Starter · #5 ·
Have you been tracking fuel mileage before the change? I would be interested to know what the actuals are. Just because RPMs are lower at a certain speed doesn't necessarily equate to better fuel economy. Sometimes it take more fuel to maintain a lower RPM at a desired speed because of the power band and aerodynamic drag. Many of the motorcycles with 6 speeds actually attain their top speed in 5th gear.

Don't forget to compensate for the odometer change. Use the GPS miles instead.
Fuel mileage has not been affected, has not improved but has not reduced either. The gearing seems perfect now. Remember that I changed one sprocket first, then took it for a ride, didn't get what I needed and changed the second sprocket, that did it.
 

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Not sure what year of your bike, but the stock gearing on a first generation was 15/46 resulting in a 3.06 ratio. Your 15/43 results in a 2.86 ratio. In most cases that would result in something in the range of 500 rpm difference with the bike travelling at the same speed with the respective gearing..That's why I was asking the questions I did. I'm no expert on a dyno run, but the gearing change would result in the torque curve coming in later, related to the speed over ground and the bike would tend to be slower off the mark.
You might get more top end in theory, but overcoming the wind etc, will not allow the bike to pull max rpm in 6th gear, if it would even do it on a stock bike. You will get more top end in real world driving out of a bike that is geared slightly lower. Stock gearing is always going to be a compromise. Glad your setup does what you want it to do.
 

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Well, changed the factory front and rear sprockets for a 15t front and 43t rear, it's like a whole different motorcycle. I can go 23mph in 1st gear at 7,000 RPMs and 44 MPH on second gear.
So I went from a 3.29 ratio to a 2.87 ratio and didn't have to change the number of links on the chain as the ratio for old and new came to 112 links for both - that's awesome.
It did lose 14.6% torque but gained 14.6% more speed which is fine by me because I'm not going to be doing any serious off-roading, this is for going through gravel and dirt roads and light trails on national parks and state parks.
At 70 MPH it's running at 7,800 RPMs where before I was spinning at 9,000 RPMs, so my fuel mileage will be much better and the engine wear will be much less.
I've read on the threads that older model would get a check engine light and ABS light when changing to this gear ratio but mine is a 2021 and did not have that issue. I went on a 5 mile ride and neither the check engine nor ABS lights ever came on.
I put a GPS speedometer app on my phone to check speedometer accuracy and it's 4 MPH off. At an indicated 60 mph it's actually 56mph per GPS and at an indicated 70 mph it's actually 66 mph per GPS. I can definitely live with that.
I'm extremely happy with its performance now. Kawasaki advertises it as an adventure tourer but they geared it more for offroad and light touring. I simply changed the gearing for great touring and light off-roading - that fits my use case perfectly now.
Thanks
What year X300 do you have that both sprocket were changed out? The earlier X300 from 2017 - 2019 (ish) for sure really messed with the dash with errors and blanking out the gear indicator and lit the ABS and Engine. I have a 2021 and changed the front only to a 15 Tooth rubber bumpered sprocket (keep noise down) and it has change the RPM more to my liking. 40 mph = 4300 rpm, 50 mph = 5500 rpm, 60 mph = 6600 rpm, 70 mph = 7800 rpm, 80 mph = 9000 rpm. I'm not sure if I want to go to a 43 in the rear but if it is no problem with the dashboard I may do just that. Once rolling out on the street I still start out in 2nd gear as 1st gear most of the time is worthless. But better than the stock 14 tooth front that made 1st gear unusable all together on the normal city riding. At least now I can get about 19 mph before my engine just sounds like it is screaming. ~ 7000 rpm.
 
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Just got a '20 and trying to find sprockets in our rural-ish area. Kawasaki dealer is stumped. I'd at least like to try the 43t rear as a winter project. Where are you finding and purchasing the sprockets? Link?
Thx!
Just a side note first: If rear sprocket isn't worn it is easier and much less cost and effort to change the front to a 15 tooth rubber bumpered sprocket for the same results (about 10% change without computer problems if you go more then about 10%). If your stock 46 tooth rear is needing replacement ignore the 12 lines below this comment.

For a FRONT 15 Tooth Sprocket, rubber bumpered, an alternate is available that is thinner in width and 2 additional genuine Kawasaki washers are needed. This is what I'm running and is a great update (IMHO) This is documented in my video on my YouTube channel in great detail. My video LINK: 2017 to 2021 Kawasaki Versys X300 changing to a JT Sprocket 15T rubber cushion (part 1 of 2) - YouTube
The sprocket is a J.T. Sprockets and the part number is JTF565.15RB (565 application and 15 tooth RB (rubber bumpered)). The bumper keeps the noise down like the stock 14 tooth bumpered.
Source #1 for the 15 RB Amazon for under $12, LINK: Amazon.com: JT Sprockets JTF565.15RB 15 Tooth Rubber Cushioned Front Countershaft Sprocket : Automotive
Source #2 for the 15 RB Dennis Kirk DOT com for under $11 (but shipping is extra) LINK: JT Sprockets Front Rubber Cushioned Sprocket - JTF565.15RB Dirt Bike Motorcycle | Dennis Kirk
This JTF565.15RB needs the washers that are Kawasaki splined parts so see my video. The washers are available and cheap.
For a REAR 46 or 43 Tooth Sprocket I've had to search more for the stock size ( 46 tooth ) that would be a replacement but J.T.Sprocket makes a direct replacement for half the cost of the Kawasaki part. ($35 instead of $65)
The 46 tooth part number is JTR486.46 (46 Tooth Steel Rear Sprocket. So the J.T.Sprocket application series for our Versys X300 is JTR486 and you would need the J.T.Sprockets JTR486.46 (46 tooth Steel Rear Sprocket)
Source for J.TSprockets JTR486.46 Amazon (46 tooth ) $35 LINK: Amazon.com: JT Sprockets JTR486.46 46 Tooth Steel Rear Sprocket : Automotive
Source for J.T.Sprockets JTR486.43 Amazon (43 tooth ) $29 LINK: Amazon.com: JT Sprockets JTR486.43 43T Steel Rear Sprocket : Automotive
If you want to really get into the detail see the J.T.Sprockets Application guide (a bit if decoding is needed) lol
LINK: JT Sprockets Application Guide 2021.pdf
 

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2021 Versys-X 300 2021 Z900RS
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What year X300 do you have that both sprocket were changed out? The earlier X300 from 2017 - 2019 (ish) for sure really messed with the dash with errors and blanking out the gear indicator and lit the ABS and Engine. I have a 2021 and changed the front only to a 15 Tooth rubber bumpered sprocket (keep noise down) and it has change the RPM more to my liking. 40 mph = 4300 rpm, 50 mph = 5500 rpm, 60 mph = 6600 rpm, 70 mph = 7800 rpm, 80 mph = 9000 rpm. I'm not sure if I want to go to a 43 in the rear but if it is no problem with the dashboard I may do just that. Once rolling out on the street I still start out in 2nd gear as 1st gear most of the time is worthless. But better than the stock 14 tooth front that made 1st gear unusable all together on the normal city riding. At least now I can get about 19 mph before my engine just sounds like it is screaming. ~ 7000 rpm.
Where did you get the 15T rubber bumper (dampened) sprocket?
 

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Well, changed the factory front and rear sprockets for a 15t front and 43t rear, it's like a whole different motorcycle. I can go 23mph in 1st gear at 7,000 RPMs and 44 MPH on second gear.
So I went from a 3.29 ratio to a 2.87 ratio and didn't have to change the number of links on the chain as the ratio for old and new came to 112 links for both - that's awesome.
It did lose 14.6% torque but gained 14.6% more speed which is fine by me because I'm not going to be doing any serious off-roading, this is for going through gravel and dirt roads and light trails on national parks and state parks.
At 70 MPH it's running at 7,800 RPMs where before I was spinning at 9,000 RPMs, so my fuel mileage will be much better and the engine wear will be much less.
I've read on the threads that older model would get a check engine light and ABS light when changing to this gear ratio but mine is a 2021 and did not have that issue. I went on a 5 mile ride and neither the check engine nor ABS lights ever came on.
I put a GPS speedometer app on my phone to check speedometer accuracy and it's 4 MPH off. At an indicated 60 mph it's actually 56mph per GPS and at an indicated 70 mph it's actually 66 mph per GPS. I can definitely live with that.
I'm extremely happy with its performance now. Kawasaki advertises it as an adventure tourer but they geared it more for offroad and light touring. I simply changed the gearing for great touring and light off-roading - that fits my use case perfectly now.
Thanks
I just bought a 2021 Wee Versys also. :) I'm still putting on the break-in mileage; only 110 miles so far. :cry:

You said, "Kawasaki advertises it as an adventure tourer but they geared it more for offroad and light touring. I simply changed the gearing for great touring and light off-roading - that fits my use case perfectly now."

I agree, and I want to change the gearing also. I had a Suzuki TU 250x that the stock gearing was extremely low, after I changed it, I loved that bike, even as slow as it was.

Now that a month has gone by... Did the check engine light come on? Does the gear indicator still work?
 

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Where did you get the 15T rubber bumper (dampened) sprocket?
My Youtube video explains everything please watch it first. What to buy and where to buy it.
LINK: 2017 to 2021 Kawasaki Versys X300 changing to a JT Sprocket 15T rubber cushion (part 1 of 2) - YouTube
This 2-part video - The 2017 to 2021 Kawasaki Versys X300 changing of the front sprocket from the stock 14 tooth Rubber Cushion to a JT Sprocket 15 tooth Rubber Cushion. The JT Sprocket is an alternate sprocket that is different in the width of the sprocket at the center spline. This video is how to do this update and what is needed to take care of the width difference. The solution is to use two Kawasaki washer parts numbers to in essence fill the gap. The stock sprocket is 9.3mm wide and the alternate is 5.8mm wide. At length the JT Sprocket tech confirmed that this alternate will not be an issue with the narrower width. The two videos will walk you through the process and provide the part numbers of everything needed. (The JT sprocket and the two Kawasaki washers). This is a pretty easy task to do it you have the the right tools. Ask any questions in the comments. The road test went great and now over 1700 miles on this setup and it is worth the upgrade. There is an advantage with the 15 tooth sprocket to lower the RPM of the bike throughout the gears. The new gear provides: 5500 rpm at 50 mph, 6700 rpm at 60 mph, 7700 rpm at 70 mph and 9000 rpm at 80 mph. About a 10% lowering in 6th gear. Here is what you need to buy and where to buy the parts- Sprocket sourced from (Dennis Kirk dot com) JT Sprockets Front Rubber Cushioned Sprocket Part number (JTF565.15RB) LINK: JT Sprockets Front Rubber Cushioned Sprocket - JTF565.15RB Dirt Bike Motorcycle | Dennis Kirk
YOU CAN ALSO buy this from Amazon with Free shipping for under $12 before tax. LINK: https://www.amazon.com/JT-Sprockets-J...
The two different genuine Kawasaki part number washers sourced from ( https://www.partzilla.com
Quantity of THREE of the 92200-0851 Kawasaki washer, Kawasaki part number: 92200-0851 - WASHER | LINK: https://www.partzilla.com/product/kaw...
Quantity of ONE of the 92200-1389 Kawasaki washer sourced from ( https://www.partzilla.com
Kawasaki part number: 92200-1389 - WASHER | LINK: https://www.partzilla.com/product/kaw...
They're all inexpensive parts for this sprocket swap.
 

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Kawasaki Versys 650, Z900RS
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Well, changed the factory front and rear sprockets for a 15t front and 43t rear, it's like a whole different motorcycle. I can go 23mph in 1st gear at 7,000 RPMs and 44 MPH on second gear.
So I went from a 3.29 ratio to a 2.87 ratio and didn't have to change the number of links on the chain as the ratio for old and new came to 112 links for both - that's awesome.
It did lose 14.6% torque but gained 14.6% more speed which is fine by me because I'm not going to be doing any serious off-roading, this is for going through gravel and dirt roads and light trails on national parks and state parks.
At 70 MPH it's running at 7,800 RPMs where before I was spinning at 9,000 RPMs, so my fuel mileage will be much better and the engine wear will be much less.
I've read on the threads that older model would get a check engine light and ABS light when changing to this gear ratio but mine is a 2021 and did not have that issue. I went on a 5 mile ride and neither the check engine nor ABS lights ever came on.
I put a GPS speedometer app on my phone to check speedometer accuracy and it's 4 MPH off. At an indicated 60 mph it's actually 56mph per GPS and at an indicated 70 mph it's actually 66 mph per GPS. I can definitely live with that.
I'm extremely happy with its performance now. Kawasaki advertises it as an adventure tourer but they geared it more for offroad and light touring. I simply changed the gearing for great touring and light off-roading - that fits my use case perfectly now.
Thanks
Hi. How did this change affected how the bike handles at low speeds? Need to use the clutch a lot? How is first gear? More or less usable?

Thanks
 

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Hi. How did this change affected how the bike handles at low speeds? Need to use the clutch a lot? How is first gear? More or less usable?

Thanks
I don't know about the 650, but I just changed my Versys X 300 to 15T front, and 44T rear. It made the bike more comfortable on the road, and the lower gears still seem to have enough grunt for the light trails and dirt roads I'll be riding. Highway mpg according to the computer seems to be averaging between 65 to 70 mpg. Personally, I'm not fond of slipping the clutch because it makes them wear prematurely and can warp the plates if it gets too hot. I'm happy with the change in gearing, but YMMV.
 

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Vx300 14/43: Urban Assault Vehicle
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Pretty sure you’re going to throw a code with 15/43 .349. It took me about a week before mine showed up at 16/46 .348. Ck engine, no gear indicator. Thay was how I got my Vx, with code freshly reset from previous owner.
You won’t really pick up any top speed with taller gearing. 103 indicated on the flat is about all there is in any ratio. There is a difference in how quickly the 300 will get to the top tho. Better acceleration with lower ratio.
A brief history of my ratio experience with my 2017.
16/46 when purchased in ‘20
14/46 rest of ‘20 season
15/46 1st month of ‘21
14/46 rest of ‘21
14/48 for a couple weeks now
 
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