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Hi everyone, I'm having engine trouble with our "new to us" 2001 Super Air Nautique.
Quick backstory: I bought the boat from a Harley dealership after the previous owner traded it in during a divorce. He claimed it was mechanically sound and had been stored unused in a climate-controlled shop since summer 2023. The dealer didn’t know anything about boats and it was a quick sell in the winter, so I couldn’t do a water test before buying.
At home, I charged the battery, hooked up water, and the engine started right up. It went into forward and reverse fine on the trailer.
This past weekend was our first time on the water. The tank had 1/8 to 1/4 gas, and I added 18 gallons without draining the old fuel—probably a mistake. It started fine, idled well, and reversed without issue. But when I put it in forward and throttled up, it ran rough, shuddered, and stalled. It would restart after cranking, but stall again under forward throttle. It runs fine in neutral and reverse.
I plan to change the FCC filter (current one looks clean) and clean the throttle body. Spark plugs look good. Based on this, what would you check next?
Thanks!
Quick backstory: I bought the boat from a Harley dealership after the previous owner traded it in during a divorce. He claimed it was mechanically sound and had been stored unused in a climate-controlled shop since summer 2023. The dealer didn’t know anything about boats and it was a quick sell in the winter, so I couldn’t do a water test before buying.
At home, I charged the battery, hooked up water, and the engine started right up. It went into forward and reverse fine on the trailer.
This past weekend was our first time on the water. The tank had 1/8 to 1/4 gas, and I added 18 gallons without draining the old fuel—probably a mistake. It started fine, idled well, and reversed without issue. But when I put it in forward and throttled up, it ran rough, shuddered, and stalled. It would restart after cranking, but stall again under forward throttle. It runs fine in neutral and reverse.
I plan to change the FCC filter (current one looks clean) and clean the throttle body. Spark plugs look good. Based on this, what would you check next?
Thanks!
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