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Motor ran great all day, but when running down River at end of outing, I developed power loss at WOT. Engine would stumble badly. If I backed down to 4000-4800 rpm all seemed ok. Back up to over 5000 stumbled again. Switched fuel tanks...same thing. I ran another mile at 4000 ok.Then started stumbling at even lower rpms. I turned engine off...started and repeated problem.
I let it rest while fishing for thirty minutes. Started right up. Got on plane to 5200 rpm... twenty seconds later it stumbled. This time I did not back off throttle and it died. I never could restart (luckily only thirty yards from ramp)!
Got home and pulled plugs...I have no spark. Kill switch is in place.
Motor was rebuilt and carbs and waterpump etc. back in March (coils, wires, etc. all original). It had been running perfectly until as I described.
Any ideas?
I let it rest while fishing for thirty minutes. Started right up. Got on plane to 5200 rpm... twenty seconds later it stumbled. This time I did not back off throttle and it died. I never could restart (luckily only thirty yards from ramp)!
Got home and pulled plugs...I have no spark. Kill switch is in place.
Motor was rebuilt and carbs and waterpump etc. back in March (coils, wires, etc. all original). It had been running perfectly until as I described.
Any ideas?
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