[ninja250]

No, the old original shims basically end up useless after the first valve job. The valves on that bike wont go back to that clearance again until the bike is brand new or gets new valves.

On the bonus, the first valve job of a 636 seems to eat the shims that a ninja 250 craps out on it's first valve job.

I was able to do a 636 with left over Ninja 250 shims. Size 2.90 mostly and 2.95 and one 3.0 from my kit.

Lots of 2.95 and 2.90 come out of the ninja and it gets reduced to between 2.85 and 2.65.
Never back up to 2.95.

A good extensive shim kit could be worth a good amount of money to a garage.. but you may still need more of certain sizes if you do the same type of bike over and over. And you will end up with the same type of extras over and over.

I have a bunch of 2.95 laying around if anyone needs them, but they won't!