Observed Valve Clearance

[barry hess_imp]

The shim sizes are unlikely to be compatible. There are multiple shim sizes but the most popular today is the 7.5mm (7.48mm). 25mm were very popular on bikes in the 80's and 90's.

As an example, my 1995 Triumph are 25mm shim over bucket and the 2017 CB1100EX is a smaller shim under bucket. Smaller shims are used on more modern engines to reduce the mass which has to move very fast.

There are no end of online sellers. You just need to get the right diameter for your bike and then the right thickness depending on your requirements. You might find a shim kit better value for money if you have a lot to do but possibly not, it just depends on what you need and how much time you have to spare.

Thanks for your input. I have 25mm shims on top. I will check with my local shop, but I don't think they will be of much help. Thay won't do a state inspection on a bike from the eighties.