Here is what happens, when I hit 3100 to 3300 rpm or 3/4 throttle, the engine bogs. If I'm by myself or if 1 heavier person is in front and nobody is in back, the bog is almost eliminated. It is still there but it isn't too bad. Now, if I have a lot of weight in the boat, the bog gets worse. It is very frustrating, especially trying to pull a skiier.
This is what I have: '95 2000sr Maxum with a 4.3 LX. It has a 21P stainless prop. I bought this boat last year as a project. Owner found a cracked block and ended up selling it to me for a good price. I was new to boats, but built a new 4.3 short block and had the original heads reconditioned. The carb is a 4bbl carter/weber. It was "newly" rebuilt and came with the box of parts that I got with the boat. I've had the boat running for a year and have put at least 100 hours+ on it. The boat has no issues going 46 mph (gps) at about 4600 rpm. The ignition system is the thunderbolt 4 (the ignition where you can not lock out the advance by grounding a wire.)
What I have done so far:
carb:
-Rebuilt carb, verified every last detail was correct.
-Verified choke is working correctly and that the secondaries open at the right time.
-air valve is not in a bind and opens up
-swapped out different step up springs for the metering rods
-I have tried every last possible position with the accelerator pump.
ignition:
-adjusted timing per manual...have added and subtracted additional timing trying to see if problem goes away
-new plugs (a few times)
-new wires
-i have never replaced the coil, cap and/or rotor
fuel:
-haven't tested the pump, but it hasn't missed a beat at wot blasts at 46 mph
engine:
-just tested compression, it is 180-185psi across the board
-oil pressure is dead on, coolant temp is around 185 after warm up.
Anyone have any good advise for me? I'm new to boats but have a ton of experience drag racing and building all my own equipment throughout the years, but I mainly deal with fuel injection. This bog has me frustrated lol.
This is what I have: '95 2000sr Maxum with a 4.3 LX. It has a 21P stainless prop. I bought this boat last year as a project. Owner found a cracked block and ended up selling it to me for a good price. I was new to boats, but built a new 4.3 short block and had the original heads reconditioned. The carb is a 4bbl carter/weber. It was "newly" rebuilt and came with the box of parts that I got with the boat. I've had the boat running for a year and have put at least 100 hours+ on it. The boat has no issues going 46 mph (gps) at about 4600 rpm. The ignition system is the thunderbolt 4 (the ignition where you can not lock out the advance by grounding a wire.)
What I have done so far:
carb:
-Rebuilt carb, verified every last detail was correct.
-Verified choke is working correctly and that the secondaries open at the right time.
-air valve is not in a bind and opens up
-swapped out different step up springs for the metering rods
-I have tried every last possible position with the accelerator pump.
ignition:
-adjusted timing per manual...have added and subtracted additional timing trying to see if problem goes away
-new plugs (a few times)
-new wires
-i have never replaced the coil, cap and/or rotor
fuel:
-haven't tested the pump, but it hasn't missed a beat at wot blasts at 46 mph
engine:
-just tested compression, it is 180-185psi across the board
-oil pressure is dead on, coolant temp is around 185 after warm up.
Anyone have any good advise for me? I'm new to boats but have a ton of experience drag racing and building all my own equipment throughout the years, but I mainly deal with fuel injection. This bog has me frustrated lol.
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