Hi guys, quick question. I have a 1994 Bayliner 2452 Hardtop, with a repowered 5.7L Merc MCM 260 in it, and a thunderbolt 5 ignition., alpha one outdrive. The strangest thing happened this season.
Took the boat out a few days ago, with 7 people on it, full fuel. It wouldnt get on plane, maxed out at 15 MPH and 2100 RPMs. I assumed it was because we had 7 people and a full tank of gas on it.
Decided to take it home, drain the gas, replace the air filter, and take it back out with just 2 of us. As soon as we launched, it jumped on plane immediately and went 32 MPH @ 3000 RPMs full throttle. Stayed on plane for 10-15 minutes, then I idled it down to grab a drink.
Went back under throttle, and the same. Exact. Thing. Won't top 2100 RPM, or 10-13 MPH, even with only 2 of us it on it. I never got it to get past 2100rpm or back to 32MPH again once it was fully warmed up for the rest of the day. I let it sit and turned it off for 5-10 minutes a few times, same thing. We are at a loss for ideas. My next step is to check plugs / wires / cap but they are less than a year or two old, and 10 hours on the boat. Anyone have any suggestions before I lose my mind?
Took the boat out a few days ago, with 7 people on it, full fuel. It wouldnt get on plane, maxed out at 15 MPH and 2100 RPMs. I assumed it was because we had 7 people and a full tank of gas on it.
Decided to take it home, drain the gas, replace the air filter, and take it back out with just 2 of us. As soon as we launched, it jumped on plane immediately and went 32 MPH @ 3000 RPMs full throttle. Stayed on plane for 10-15 minutes, then I idled it down to grab a drink.
Went back under throttle, and the same. Exact. Thing. Won't top 2100 RPM, or 10-13 MPH, even with only 2 of us it on it. I never got it to get past 2100rpm or back to 32MPH again once it was fully warmed up for the rest of the day. I let it sit and turned it off for 5-10 minutes a few times, same thing. We are at a loss for ideas. My next step is to check plugs / wires / cap but they are less than a year or two old, and 10 hours on the boat. Anyone have any suggestions before I lose my mind?
