Is the benefit of going up 1 on the rear worth the price of the rear sprocket? Front sprocket is cheap and works great.

 

Re: chain tension
The general consesus seems to be that it is better to have the chain at the loose end of the spec.
Sprocket:
One tooth on the front equals three on the back. I agree with changing just the front to start.

 

i started with +1 front (you can use the original chain)....but, when i needed new rear sprocket and new chain, i went +1 rear with a +2 link chain....

 

ahnh,
just to make it clear, IIRC you have the sf model, which comes stock with a smaller rear sprocket than the s model. Is that right? So, in the end did you wind up with 15/40 sprockets? Where the s model comes stock with 14/42 sprockets.

 

I created a spreadsheet if you want to see how the calcs are performed

https://www.kawasakiforums.com/forum...culator-40386/