fzs 600 mk1 engine compression test

[mechanical music]

hi all, anyone know what the engine cylinder compression test should be in psi for a good engine, ive done the test cold on s/hand engines i have bought before fitting in the bike, but so far the reading on 2 engines both show the 3rd cylinder is about 50psi less than the other 3 ?, thanks for any help

[BBROWN1664]

The yamaha manuals are in the download section to give you the official yamaha figures