thinking of doing an engine flush with PB blaster ....

[yam240sx]

Yea just drop a pump in a big drum of the stuff and pump through flush hose with engines running ! ... LOL .. no but after cleaning out my jet nozz grate and seeing how bad it was could only imagine what inside engine ports look like ...

 

[WREKS]

If engine is not overheating, I would just try to dry it out by running it 60 seconds without water. Doing that periodically while the boat is laid up will prevent bio-fouling.