1970 Rebourne

[Bushwacker]

Nice looking rig and good choice on one of the lighter 4-strokes where weight is critical with a bracket!

". . . The Piston in the # 3 cylinder got water intrusion through the water jacket and there is a dime size hole in the top of it. . . . "

This comment got my attention, as a hole in a piston is often the result of detonation, which you can't hear on a 2-stroke since there are no valves to rattle! Detonation/pre-ignition can often happen with hot-burning lean mixtures, which could be caused by either a plugged jet/injector or a restriction in the fuel supply. Did anyone check the No. 3 injector on old motor? Something like a stuck anti-siphon valve at the fuel tank could cause a similar problem on the new motor! Hopefully the dealer installed new 3/8" fuel lines and T'd a vacuum gauge into the line between boat fuel filter and motor to measure fuel restriction. A vacuum reading no higher than about 4" Hg @ WOT is probably ok, but might be worth checking to see if Suzuki has a spec for that!