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Nissan 4 stroke 15 HP issues

587 Views 2 Replies 2 Participants Last post by  SalmonSlayer
I have a 15 HP 2004 Nissan 4 Stroke that will idle pretty well. When I try to rev it while under a load, it chokes out. It will die completely unless I back off the throttle. If I slowly work the rpm up, it will gradually get there, but still is working way too hard to push my 19' boat at 2.5mph. When I first got it, 1 year ago, it was basically new from Cabelas. The prop shaft had been rebuilt when someone backed into a rock. It ran great then...pushed the boat to 6mph no problem at wide open throttle.

I pulled the 2 plugs and replaced them with new. Ran better, but still bogged down under a load. If the motor is not in gear, it will rev up fairly decent...but not if I goose the throttle.

Could I have a gas line issue...or did something vibrate out of wack on the carbs? I believe this is fuel injected...I'll have to look tonight.

Does anyone have any ideas of what to try next?

Thanks for any help.
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Sounds like your engine is being starved for fuel. Check your fuel system out. Replace the fuel filter, if it is fuel injected check the fuel pump for proper fuel pressure, if it is carburated clean the carbs, check the fuel tank for debris build up. Check the intank fuel filter. These things will make your engine run the way you describe it.


SalmonSlayer said:
I have a 15 HP 2004 Nissan 4 Stroke that will idle pretty well. When I try to rev it while under a load, it chokes out. It will die completely unless I back off the throttle. If I slowly work the rpm up, it will gradually get there, but still is working way too hard to push my 19' boat at 2.5mph. When I first got it, 1 year ago, it was basically new from Cabelas. The prop shaft had been rebuilt when someone backed into a rock. It ran great then...pushed the boat to 6mph no problem at wide open throttle.

I pulled the 2 plugs and replaced them with new. Ran better, but still bogged down under a load. If the motor is not in gear, it will rev up fairly decent...but not if I goose the throttle.

Could I have a gas line issue...or did something vibrate out of wack on the carbs? I believe this is fuel injected...I'll have to look tonight.


Does anyone have any ideas of what to try next?

Thanks for any help.
how can I tell if my fuel line is sucking air?

The primer ball seems to stay hard when running the engine. Is there another indicator that would tell me where the issue is?

thanks for the reply bigcountry ... I was thinking lean also...just wasn't sure if fuel lines or adjustments somewhere on the motor.
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