"Thank you for the interest Gu
"Thank you for the interest Guy and Bondo, the operator lost the gas filler cap last year, did not replace it, then had water in the fuel tank, that was pumped out, but then had a leaking manifold, had to replace a piston, all the bearings, new manifolds and risers. Boat then launched and no power under load yesterday Sunday and runs on when ignition turned off. Pulled fuel filter and found 3/4 full of water, replaced filter and engine starts and runs much better, no spitting back through double Weber carb, but still runs on fot 10-12 secs. Checked fuel pipe going into carb for clogged gauze filter, but no filter fitted. Suspect contaminated carb. Tried timing light but no trim plate fitted to crankshaft pulley area. Retarded timing to bring idle rpm back from 1000 to 650 but it still runs on. Will a carb service solve both power and run on problems? Thank you for your time"