1992 60hp Johnson issue

[Deerslayer99]

Hey guys and gals....been awhile since ive posted but here is my issue....I have the above engine on my boat and everytime i put in the water and throttle up to full speed the engine will slow down to a fast trolling speed and continue at that speed for about 15-20 min and then take off like a rocket and be fine for the rest of the day....it idles smooth, never bogs down and no hiccups in the sound of the engine running....compression is good ....im thinking it may be a relay of somewhat or something electrical not the fuel as it runs very smooth.....thanks

[Woodsman]

Almost sounds like the high speed orifice is partially plugged.
Have you tried using some Sea-foam mixed in the gas & fogging the carb with Sea-foam.

[Deerslayer99]

No I have not as I dont think its a fuel/carb issue as the motor runs as smooth as can be .....idles perfect.....

[Woodsman]

If fuel is getting through the low speed orifice fine it will run smooth at low speeds.
When you speed up the high speed orifice opens up. If there is a restriction here the motor will not jump up to speed but run slowly.

[sawbill]

I have the same motor but its the Evinrude version. I've had a ton of issues with air leaks at various locations in the fuel line. Normally this lets you run at trolling speeds but it would die out at higher speeds. I'd spend half my time on the water squeezing a soft primer bulb. So this could be a place to look.

[Deerslayer99]

been there done that....bulb hard not starving for fuel

[Rick in Muskoka]

I have the 1988 version of the 60 HP. I run only premium gas without ethanol in it and add sea foam to every tank. When you get your premium gas, (Canadian Tire sells premium without ethanol) pump the first 10-12 litres into your car then fill your boat gas tank or jerry can. If the last person to use the pump, pumped regular gas then the first 10-12 litres already has regular gas in the combined piping system.

[smitty55]

I have the 1988 version of the 60 HP. I run only premium gas without ethanol in it and add sea foam to every tank. When you get your premium gas, (Canadian Tire sells premium without ethanol) pump the first 10-12 litres into your car then fill your boat gas tank or jerry can. If the last person to use the pump, pumped regular gas then the first 10-12 litres already has regular gas in the combined piping system.

Wow, I never would have figured that there was that much fuel in the lines before getting what you actually select to pump. Good to know. Tks.

Cheers

[troutperch]

I would think that 3 to 4 litres is enough to clear the line.

[Bluebulldog]

Gotta go +1 on the high speed jet.