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I have a 4.3LX and under load it will not go past 4000 RPM…

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I have a 4.3LX and...
I have a 4.3LX and under load it will not go past 4000 RPM and it suppose to go to 4500 RPM.So what could be the problem?
Submitted: 8 years ago.Category: Boat
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Answered in 1 minute by:
6/21/2010
Marine Mechanic: Captain Dave, Marine Mechanic replied 8 years ago
Captain Dave
Captain Dave, Marine Mechanic
Category: Boat
Satisfied Customers: 3,847
Experience: USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience
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Hello. Has it ever gone beyond 4000 RPM? What kind of baot is this powering?
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Customer reply replied 8 years ago
It is a Rinker Capitiva 209 21 ft. Yes it has gone past 4000 RPM before. It just started this. The top speed is only 30 MPH it use to be 40 mph
Marine Mechanic: Captain Dave, Marine Mechanic replied 8 years ago
OK, thanks - I wanted to make sure this wasn't a prop issue. I assume it is the same prop and that it is in good shape with no major dings, etc. Are you using fresh gas, or is this gas left over from last year? If so, that could explain a lot, and I would drain or use up the old fuel and try it with fresh gas. If not, then you should perform a compression test on the motor to see if you have any mechanical issues - a bad or sticking valve, for example, could explain it. If the compression check OK I would next do a spark test to make sure you are firing on all cylinders. If that is OK then that leaves the fuel system - you could have some fule restriction or deposits in the carbureter.
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