I have a packet of 3mm id x 0.6mm thick washers to do my shimming for my yoshi slipon.

Can anyone tell me what thickness Dynojet or Factory Pro or even other manufacturer's shim's are?

Factory pro kit contains 3mm x .5mm shims

The factory pro shims I that came in their kit were every so slightly thinner than any washers I could find anywhere. The ones you have will be fine. I had my bike shimmed with hardware store washers for a long time before I bought the FP kit, and I only really bought it for the needle. The thinner washers do give you a little more control over height adjustment though. But that being said, if you need to raise your needles a lot, then the thin FP washers aren't as good cuz you would need 4-5 of them compared to 3 hardware store washers. Make sense?

Thanks for the information :thumbup: