VeroWing
Petty Officer 2nd Class
- Joined
- May 16, 2009
- Messages
- 150
I have a 1989 Grady 241 with a low hour (300ish) 1997-98 350/260 Magnum carbed engine. Boat sat for a few years on trailer prior to my buying it, but was starting occasionally according to prior owner. I'm been going through everything for over a year, including fuel lines, exhaust manifolds (raw), plugs, wires, Ignition p-up, separator, lower unit serviced, and on and on. Drained fuel tank and replaced with fresh fuel, and pulled Weber carb, cleaned and installed new cab kit. Set fuel/air screws at 1 1/4 turns out, and set floats at 5/8" closed, and 1 1/8" open. My problem is, when I take boat out on water to determine correct prop, rpms get to 3900-4000, and then engine bogs down to almost completely stalling, and actually stalling several times. I put drive in neutral and it starts right back up, and idles fine, and will start off again up to the same rpms and then abruptly fall off again and stall, or almost stall. I tried several different props, and it doesn't matter. It seems to me like I may be emptying the carb, like maybe the floats are not letting enough fuel in, OR, there is a rev limiter somewhere that is holding rpms to a 3900-4000 limit. it has the Thunderbolt V ignition, and I replaced cap, rotor p-up, etc. Engine has good even compression, starts right up and runs smooth and stays around 180ish degrees. Does anyone have any suggestions on what my problem may be? Do you thing setting the floats 5/8" closed, and 1 1/8" open (as per rebuild kit instructions) may be the problem? Any suggestions are appreciated.
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