Hello, I have a 1998 Yamaha YZF-R1. I replaced the lid on the block, and hats that they are on top of the valves, they fell away. I put them back but I did not know the exact placement of the washers under their hats. Now if the engine start and then came the valve clatter. otherwise the engine starts and runs perfectly. whether it is doing something wrong? Thank you

The shim sizes have to be calculated based on a known shim and measured clearance.

You should replace the buckets and shims in the places they came from - too late now. Get a workshop manual, read up on checking valve clearances, then check them and fit the correct size shims.