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That is the easiest thing to do, when you are changing chains and sprockets:grin2:. Just open the nuts, take the old sprocket away and put the new one to its place. The torque for the nuts is 44 ft lb/60Nm.

By the way, if I have understood right, the item number for a 40-teeth sprocket made by JT Sprockets is JTR1486-40.
 

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Here is some general info on changing gearing and sprockets (on the 250, but the same ) -

https://faq.ninja250.org/wiki/Final_Drive

I'd also suggest shimming your cush-drive when you do the sprocket -

https://faq.ninja250.org/wiki/Final_Drive

Also consider changing the countershaft sprocket instead of the rear sprocket.

A steel rear sprocket (like a JT) will wear a lot longer than an aluminum one (like a Vortex).
 

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Don't use 1/4" drive when loosening the sprocket nuts. My only 14mm socket was 1/4" drive and the 3/8" F to 1/4" M adapter I was using snapped whilst loosening the bolts. It was all I had in the moment so I was lazy and used it. Had to run to the store to buy a bigger drive 14mm socket and a new adapter.


I just recently switched my sprocket from the stock 42t to a steel JT 40t and so far I've been really liking the changes. Stretches the gearing out a bit, makes first gear a lot more versatile, and lowers engine rpm for a given speed when cruising on the highway. You can definitely feel the engine working harder though and acceleration takes a hit with the reduced leverage over the wheel you're getting with the smaller sprocket. This becomes very noticeable at higher speeds when air resistance becomes significant.
 
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