15 horse gargling when trying to power up

[tugboat80]

I have a J15RENM been a good runner for a year. Compresses 109 and 111 psi. Lately after trolling around 1.5 knots, it gargles and may die when I open the trottle. Should I suspect a tired fuel pump? or a gummy carb? I use non ethanol premium and near 3oz XD50 per gal. New NGK plugs. It runs clean and even at WOT and same at minimum rpm. Lake temperature 58 degs.

 

[oldcatamount]

Re: 15 horse gargling when trying to power up

After you're done trolling next time out, before you throttle up, give the primer bulb a couple of squeezes. If the motor responds, the fuel pump could be weak. Check the fuel lines for a leak (or a loose clamp) and check the cap on the fuel tank to see if it's venting correctly. I think you'll find that Johnson motors seem to respond better with Champion spark plugs, but that's sometimes debatable. Be sure you have the correct plugs and keep them clean/gapped right.

 

[tugboat80]

Re: 15 horse gargling when trying to power up

Motor does not respont to sqeezing primer bulb. The gargling just takes time ( 30 sec - to 1 min ) to run itself out. I will try lite choke next time