1999 vmax 150. Px150. Ox66 compression numbers

[Flying fish]

What should they be?

[rodbolt17]

within 10 PSI bank to bank.

[leveehog]

Compression numbers

And close to 105 psi

[rodbolt17]

Yamaha typically does NOT post numbers.
for a reason.
the reason is it will depend on various weather conditions AND the dang gauge.

however if all six cylinders are tested at about the same trime with the same equipment then 10 PSI bank to bank will indicate all is well, or not.
first 1987 225 looper jonny/rude I tested showed 80 psi on all 6.
grabbed another tester and got 80 psi again.

called a buddy at a jonnyrude dealer and he said that's about right.

numbers are meaningless until one is much lower than the rest.