1989 9.9 Johnson Fuel Issues

[mtetreault10]

I have an 89' 9.9 Johnson that I've recently done a TON of work on to get back into shape. Now I'm having issues with keeping it running. Here's whats going on.

• It runs but it needs to be choked
• If you push the choke in, it dies after a few seconds
• The Carb was taken apart and cleaned thoroughly
• Fresh gas and oil (50:1)
• The fuel line connections leaked a decent amount (due to 20-30 degree temps)

I can keep the motor running as long as I want but it needs to be choked (1/2-1/3) and it's much easier to control at higher RPMs. I did this until it warmed up and no change.

Any suggestions?!?! Thanks!

[bktheking]

Carb needs to be recleaned and kitted with a carb kit, welch plugs need to be removed and the carb soaked. Running on choke indicates it's not getting enough gas off choke.

The other issue could be the top plastic plate that sits on top of the carb. They can warp overtime and allow too much air into the carb while running.

[Jerry_NJ]

Sounds like it is running too lean.... when you say cleaned, are you sure the jets are clean. Maybe best to get new jets or even buy a rebuild kit. Maybe some Seafoam cleaner in your gas will do the job.

[jay_merrill]

If you are running the motor in 20 degree weather, I'm going to guess that you are running very cold water through it. Are you sure that the motor is coming up to temp? Are you sure that the T-stat is installed and is working?

Remember, also, that very cold air is more dense than hot air. I don't think that would cause a need to apply choke on its own, but in combination with a motor running under desired operating temp, I can see a situation where constant application of choke could be needed.

[wilde1j]

Sounds like it is running too lean.... when you say cleaned, are you sure the jets are clean. Maybe best to get new jets or even buy a rebuild kit. Maybe some Seafoam cleaner in your gas will do the job.

SeaFoam in the gas WON'T clean a carb. Only dis-assembly and using proper cleaning techniques will do that job.

[OptsyEagle]

If you are running the motor in 20 degree weather, I'm going to guess that you are running very cold water through it. Are you sure that the motor is coming up to temp? Are you sure that the T-stat is installed and is working?

Remember, also, that very cold air is more dense than hot air. I don't think that would cause a need to apply choke on its own, but in combination with a motor running under desired operating temp, I can see a situation where constant application of choke could be needed.

I agree. I have a 9.9 Hp Evinrude. In very cold weather I need to engage the choke put it half way in, then out again, then in again a couple of times, to keep it running. In the hot summer weather, I sometimes don't need to use the choke at all to initially start it.

All this goes away within about a minute or two of warm up, but definitely the temperature of the water and outside air makes a big difference.

You should also try enriching the carb a little to see if that helps. If it does, redue the setting procedures to get the right needle position.