I've had a couple of years' worth of trouble with the idle on this motor so I bought a SELOC manual and a carb rebuilt kit. It previously ran like a top at any speed but slow idle so I figured the carb needed to be rebuilt. Did a carb rebuild, following the instructions in the SELOC manual, and reinstalled. The carb has a single needle valve for only the low speed. There is no high-speed needle.
Now the engine will start and run at high idle but it will not continue running at low idle speed. Figured that is a needle adjustment and not a big deal. However, I now have a problem in that this motor runs like absolute garbage when I try to run it at high speeds/planing speeds. It will miss/cut out and have huge power loss. After awhile it will either not produce much power over a high idle and then it will die at slower idle speeds.
When this happens I've also experienced a few hard starts in which the plugs became wet fouled. I replaced the fuel filter screen on the fuel pump along with the carb re-install. I'm sure that it was done correctly and was the correct screen part. While in there I took a look at the fuel pump and thought it might be worth replacing down the road but have not done so yet. I also replaced the external fuel line between the gas tank and the motor but I have now reached the point where I don't want to just start throwing parts at this motor and guessing.
The best I can tell, this engine is getting a ton of fuel dumped onto the plugs. I don't have enough knowledge/experience to know how to tell whether this is because I didn't rebuild the carb correctly (this was my first rebuild but, again, I followed the SELOC instructions very carefully). Alternatively, it could be an insufficient spark that was causing the poor idle all along and now has just become more evident with the rebuilt carb involved.
Anyone have any thoughts, tips, etc. on how I can diagnose this? My first plan at this point is to pull the flywheel and inspect the points/ignition wires to see if I can spot corrosion, etc. in that system.
I guess my big question is how I can tell if I did a crappy job on the carb rebuild?
Now the engine will start and run at high idle but it will not continue running at low idle speed. Figured that is a needle adjustment and not a big deal. However, I now have a problem in that this motor runs like absolute garbage when I try to run it at high speeds/planing speeds. It will miss/cut out and have huge power loss. After awhile it will either not produce much power over a high idle and then it will die at slower idle speeds.
When this happens I've also experienced a few hard starts in which the plugs became wet fouled. I replaced the fuel filter screen on the fuel pump along with the carb re-install. I'm sure that it was done correctly and was the correct screen part. While in there I took a look at the fuel pump and thought it might be worth replacing down the road but have not done so yet. I also replaced the external fuel line between the gas tank and the motor but I have now reached the point where I don't want to just start throwing parts at this motor and guessing.
The best I can tell, this engine is getting a ton of fuel dumped onto the plugs. I don't have enough knowledge/experience to know how to tell whether this is because I didn't rebuild the carb correctly (this was my first rebuild but, again, I followed the SELOC instructions very carefully). Alternatively, it could be an insufficient spark that was causing the poor idle all along and now has just become more evident with the rebuilt carb involved.
Anyone have any thoughts, tips, etc. on how I can diagnose this? My first plan at this point is to pull the flywheel and inspect the points/ignition wires to see if I can spot corrosion, etc. in that system.
I guess my big question is how I can tell if I did a crappy job on the carb rebuild?
Last edited: