Water pressure?

[Alex from GA]

My neighbor has a late 150 2 stroke; what is the pressure supposed to be @ idle and 3 or 4K? Thanks.

[yam911]

Minimum of 11 psi at WOT is the only specification from Yamaha. And even that one is not hard and fast.

[Alex from GA]

Thanks.

[Ranger519VS]

You will only have 1 or 2 psi at idle. Won't even register on the gauge most likely.

[headhigh]

My 150 shows 0 psi at idle, but then jumps up over 15 psi @4000 rpms.

[BassinLA13]

my 225 @ idle shows nothing on the gauge and fluctuates between 15-20 psi above 3000-4000+ rpm (based a bit on how it's trimmed - but can't prove that though)