does the primer bulb go soft when it does the stalling??? could be an air leak.http://www.wisnersinc.com/Fishing Info/Johnson 9.9_15.htm

 

sounds like my old car!

 

Sure sounds like a dirty carb to me. Spraying carb cleaner and/or Sea Foam (not ether) won't help. The carb needs disassembled, soaked in cleaner, and passages blown out with compressed air.

 

No the primer bulb does not seem to go soft. I have even tried pumping it when I was driving. It seems logical. Fire up the throttle to keep it running, gas pressure must be low. I do think there is a rediculous amount of hose from the tank to the motor though and thought that could be decreasing pressure.

Thanks M.Magis. Won't have time to do that this unfortunately before the weekend so looks like trolling will be a blast. Thankfully the year is winding down and I had planned on doing the year winded down regardless of the problem.

 

It actually doesn't take long. My three carbs only take me about an hour or so to disassemble, clean, and reassemble. A single carb would be much easier. Even your first time may only take an hour or so. All you'll need is some Chem Dip and some compressed air. Possibly a new gasket if it hasn't been done in a while. A manual will be a big help too, if you've not done it before.

 

This isn't going to help any, but your motor sounds like it has the symptoms of all the Johnson 4 strokers I've been around. None of them ran very well IMO.

Tim

 

You might try to run a little higher octane rating gas. My old 9.9 loves the high test and pukes and complains with regular.

I hate putting in 3.01 a gallon gas but I love the way it runs and starts with the high test. Mine is a 2-cycle and a 1982 model. Also i have to agree with Toolman I don't like the 4-strokers yet. Any of them.

 

I have a 1995 Johnson 9.9 4 stroke that I just got back from the shop after a long delay. Mine would start but stall after about 5 seconds. They thought it was the Power Pack / Ignition Module since these apparently have been quite faulty. In my case it ends up there was something clogging the jet in the carb. If you eliminate all the fuel delivery possibilities take a look at the electrical components. But don't presume anything and take a systematic approach to troubleshooting. The SELOC manual is quite helpful in this regard, as is BoatingABC.com Engines/Drives forum. The forum there has some experts that regularly monitor it and give good, sound advice (one is an executive editor at SELOC).

 

try to adjust the idle speed jet screw just a little richer, but look at the plug first see if it lookk sootie if so it is already to rich. that is what it sounds like to me,it runs good untill it gets hot then it turns to hell?

 

The year you mention is not covered, yet this link might help anyhow. http://www.wisnersinc.com/Fishing Info/Johnson 9.9_15.htm

 

Go to walleye central and search 9.9 Johnson in the boats and motors forum. I had a problem and they solved it, believe me there are tons of answers to all sorts of problems for that motor.

 

Sounds like a simple carb adjustment. Your carb has three adjustments (idle speed, idle mixture and high speed mixture). On that carb the high speed mixture is set by an oriface-type jet (not adjustable other than replacing) and since it runs fine at high speeds there is no reason to touch it.

The idle mixture is a needle valve. It sounds like you are off on this adjustment. Since it was serviced (i.e. somebody touched this), I would say that is likely. Make no more than 1/4 turn adjustments in-between trials.

You could also try turning the idle speed up a little. If it gets difficult (i.e. makes noise) going into gear, you are too high. Make all adjustments after the engine has warmed up!

Bombardier has full diagrams of the carb (and the rest of the motor) on their website that clearly shows where the adjustment screws are. Petty's (www.pettys.us) has a link to this part of the site.