Hello,
I have a Nissan 6HP four stroke on a sailboat, with the low-pitch high-thrust prop. This motor hasn't been used for a few years, but starts fine and runs fine as long as I don't run it at full or, say, 2/3 throttle. If I do that, it sometimes will hesitate, stutter, and maybe die.
It will always start up again.
It feels like fuel starvation. I think the fuel pump is ok because it seems to pump quite vigorously when I pull off the pipe to the carb. Also, squeezing the bulb on the fuel line doesn't help when it is hesitating, but sometimes a bit of choke will.
What are the most likely causes? Is it possible that a little bit of crud in the float chamber gets sucked up into the main jet when the motor is needing a lot of fuel?
I think my next step is to dismantle and clean the carb, but I don't want to do that on the boat because of the 100% certainty that I'd drop something overboard...
Suggestions?
Doug
I have a Nissan 6HP four stroke on a sailboat, with the low-pitch high-thrust prop. This motor hasn't been used for a few years, but starts fine and runs fine as long as I don't run it at full or, say, 2/3 throttle. If I do that, it sometimes will hesitate, stutter, and maybe die.
It will always start up again.
It feels like fuel starvation. I think the fuel pump is ok because it seems to pump quite vigorously when I pull off the pipe to the carb. Also, squeezing the bulb on the fuel line doesn't help when it is hesitating, but sometimes a bit of choke will.
What are the most likely causes? Is it possible that a little bit of crud in the float chamber gets sucked up into the main jet when the motor is needing a lot of fuel?
I think my next step is to dismantle and clean the carb, but I don't want to do that on the boat because of the 100% certainty that I'd drop something overboard...
Suggestions?
Doug