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285 Posts
Hi,
I started noticing an issue with my 20HP Nissan 4 stroke last time I was on the water. Running anything but WOT, even when on plane it runs smooth as ever. At WOT it will start to "studder" ever so slightly. The first time I noticed it, it kind of felt like I was running into small debris in the water so I pulled over, raised the motor, inspected everything and was back "off to the races", but kept feeling the studder at WOT. I backed off a bit after getting on plane and it ran smooth as ever.
Prop is almost brand new with no nicks or bent blades. Haven't had any collisions. The only thing I can think of is maybe bad gas. I only run non-ethanol gas in it so I have never used a fuel stabilizer or additive. It is a Gheenoe with 20HP 4 stroke so it sips gas. I use a gallon or 2 and then fill it back up after a few trips, but have never really run it to E. Just for kicks I have now dumped all remaining gas into the truck and will fill up with a fresh tank next time out, but I am interested in hearing input on other issues that might cause what I'm talking about and suggestions for things I can check into.
Thanks!
Dave
I started noticing an issue with my 20HP Nissan 4 stroke last time I was on the water. Running anything but WOT, even when on plane it runs smooth as ever. At WOT it will start to "studder" ever so slightly. The first time I noticed it, it kind of felt like I was running into small debris in the water so I pulled over, raised the motor, inspected everything and was back "off to the races", but kept feeling the studder at WOT. I backed off a bit after getting on plane and it ran smooth as ever.
Prop is almost brand new with no nicks or bent blades. Haven't had any collisions. The only thing I can think of is maybe bad gas. I only run non-ethanol gas in it so I have never used a fuel stabilizer or additive. It is a Gheenoe with 20HP 4 stroke so it sips gas. I use a gallon or 2 and then fill it back up after a few trips, but have never really run it to E. Just for kicks I have now dumped all remaining gas into the truck and will fill up with a fresh tank next time out, but I am interested in hearing input on other issues that might cause what I'm talking about and suggestions for things I can check into.
Thanks!
Dave