Find a better shop.-----Repeat----It is not a one way valve !!-----It closes if too much air goes through it.----It is a flow fuse to protect the VRO from going " boom " so to speak.----Install a simple fitting.----Get the correct pump or plug the hole at the back.----All easy in my...
That is NOT a one way fitting at all.-----It is the pulse limiter ( flow fuse ) for the VRO pump.----It should be removed.----And if air leaks out the back of the pump you have the wrong pump installed!
There is a hole on the leading edge of the gearcase !----feeds pressure to that hose.----Feeds pressure to speedometer.----Observe / look for it.-----Such a simple thing !!
If there is foam floatation under the floor it may be water logged.----And stringers and transom may be rotten.----A complete evaluation needs to be done on boat and motor before spending any beer tokens.
Timing is fixed and set at the factory.-----Does not go out of adjustment.-----Carburetors do not have mixture adjusting screws.----No such thing as a traditional tune-up on these motors !
The electric primer valve is working as designed.----That means there is pressure from the fuel pump.----Some will argue.----I suggest you remove cylinder head and inspect cylinder walls.----Head gasket is cheap.
