Hi,
I recently got a boat with a 2000 4hp Johnson. It starts using the choke, but if I try to turn the choke off it dies. I can turn the choke about 3/4 off but no further, and it still runs best around full open choke. I have the plastic air box off of the carb right now, and I can see that when I turn the choke off, the engine dies, and fuel drips out of the choke opening (from the throttle body? or from the needle/main jet? not sure).
Spark - I have not actually tested the strength of the spark jumping a gap, but both plugs spark when grounded to the motor.
Carb - fully disassembled, cleaned body, main jet, needle valve, float needle valve and seat (twice). I tested the float valve by blowing into the inlet and when the valve seats I can't blow through it at all, lift up and it goes right through. The float seems to sit just about parallel to the carb housing upside down. Also, when I reassemble with an empty bowl and squeeze the bulb I can hear the fuel squirting into the bowl and when the bulb is firm there is absolutely no noise and I can apply pressure for a couple of minutes and not get a leak of the carb, only leaks when it dies out.
Does this sound like the a cylinder isn't firing, flooding, and then it's dripping back out into the carb through the throttle body? Not sure what is really going on.
Thinking of these next 3 steps... 1. Spark gap test. 2. Carb rebuild kit. 3. Small engine mechanic.
Thanks
I recently got a boat with a 2000 4hp Johnson. It starts using the choke, but if I try to turn the choke off it dies. I can turn the choke about 3/4 off but no further, and it still runs best around full open choke. I have the plastic air box off of the carb right now, and I can see that when I turn the choke off, the engine dies, and fuel drips out of the choke opening (from the throttle body? or from the needle/main jet? not sure).
Spark - I have not actually tested the strength of the spark jumping a gap, but both plugs spark when grounded to the motor.
Carb - fully disassembled, cleaned body, main jet, needle valve, float needle valve and seat (twice). I tested the float valve by blowing into the inlet and when the valve seats I can't blow through it at all, lift up and it goes right through. The float seems to sit just about parallel to the carb housing upside down. Also, when I reassemble with an empty bowl and squeeze the bulb I can hear the fuel squirting into the bowl and when the bulb is firm there is absolutely no noise and I can apply pressure for a couple of minutes and not get a leak of the carb, only leaks when it dies out.
Does this sound like the a cylinder isn't firing, flooding, and then it's dripping back out into the carb through the throttle body? Not sure what is really going on.
Thinking of these next 3 steps... 1. Spark gap test. 2. Carb rebuild kit. 3. Small engine mechanic.
Thanks