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