Yamaha 225VMAX low water pressure

[ransboat]

Anyone ever have low water pressure even after replacing the impeller? I have a 2000 Yamaha VMAX 225VXTLRY. I replaced the two thermostats and impeller kit. Runs fine until long periods at idle then high heat alarm goes off. No pressure on gauge at idle and around 10PSI at WOT. Water is flowing because it is peeing. Any ideas? Rodbolt, if you are out there let me know your thoughts.

 

[99yam40]

Re: Yamaha 225VMAX low water pressure

Rod has not posted here in quite awhile, but you need to check your PRV .
sounds like it is stuck open dumping water

 

[ransboat]

Re: Yamaha 225VMAX low water pressure

Thanks, can you tell me where to locate the PRV. From what I can tell in the service manual it looks like it is under the cpu unit.

 

[sdranger]

Re: Yamaha 225VMAX low water pressure

bottom right corner of cpu just underneath the connector.