scoflaw
Well-Known Member
- Aug 10, 2011
- 6,395
- Boat Info
- 1999 Powerquest legend 260 sx 502 mag
2005 Baja 242 islander 496
- Engines
- 502 mpi Bravo 1
496 mag B1
Check for spark next.
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Low rmp then stalls outSentence is bad context. what is “will low rpm then stall”?
Engine started but will low RPM then stalled. What should I look for‽
Is there an additive to put in fuel or something the un-gunks the carb. before we go with rebuilt or new Carb.Based on this statement the issue is a fuel issue and not a spark issue.
You are going to have to troubleshoot the fuel system to find the fault.
If its carbureted is fuel getting to the carb? If injected is there appropriate pressure at the injectors?
If there isn't fuel getting there or with insufficient pressure odds are the fuel pump went.
If its carbureted and you can smell fuel in the exhaust odds are there is gunk in the carb keeping the float valve from closing and the engine is instead flooding. You will have to get the carb cleaned and rebuilt if this is the case.
If the pump is for sure good and its still not delivering fuel you will have to check all the lines and fuel pickups in the tank.
Is there an additive to put in fuel or something the un-gunks the carb. before we go with rebuilt or new Carb.
Sorry no fix in a can for something like this.
Cleaning and rebuilding the carb is not too difficult of a job. You just have to be absolutely careful not to damage or loose any parts while working on it. Real easy to over-tighten a screw and strip the threads.
I prefer to put an old towel, sheet, or T-shirt down on my workbench to lay all the parts on while I work on one. It keeps things from rolling away or bouncing off the table.
A good spray can of carb cleaner and some compressed air along with a razor blade and brass brush to clean old gaskets are sufficient to clean a carb with.
Most rebuild kits come with an exploded parts diagram so you should be able to see how to take it apart and put it together again.
If you don’t trust yourself with this just take it off and get the rebuild kit and any mechanic near you should be able to do it for you for a minimal fee.
When you put it back on you’ll have to readjust the choke and the mixture screw. Usually a good start for the mixture screw is 1 and 1/2 turns from closed.
Sorry no fix in a can for something like this.
Cleaning and rebuilding the carb is not too difficult of a job. You just have to be absolutely careful not to damage or loose any parts while working on it. Real easy to over-tighten a screw and strip the threads.
I prefer to put an old towel, sheet, or T-shirt down on my workbench to lay all the parts on while I work on one. It keeps things from rolling away or bouncing off the table.
A good spray can of carb cleaner and some compressed air along with a razor blade and brass brush to clean old gaskets are sufficient to clean a carb with.
Most rebuild kits come with an exploded parts diagram so you should be able to see how to take it apart and put it together again.
If you don’t trust yourself with this just take it off and get the rebuild kit and any mechanic near you should be able to do it for you for a minimal fee.
When you put it back on you’ll have to readjust the choke and the mixture screw. Usually a good start for the mixture screw is 1 and 1/2 turns from closed.
We got engine to run and sound great after it warmed up. But then it overheated. The garden hose was connected the whole time. However the stern drive was lowered down about 90% not 100%, if it makes a difference. We shut it down and check the hoses on the engine and they were only warm. What is our next step, water pump, impeller, etc.
Should I see the antifreeze used to winterize the boat flush out? And should the sterndrive be completely down. I'm asking because I can tell if water is being drafted up into the engine.
@Roger K SterlingThanks for all the assistance. The engine is running and looks like we have to replace the impeller as the engine is over heating and there is no apparent water flow. Will keep you all posted.