Slow starting 150 Johnson

[maltemus]

I have a 1999 Johnson 150 outboard, standard Carb. This summer it is very slow to start. I crank it on and off for about 3 - 5 minutes. Finally it starts. Once warm, runs great all day, re starts in seconds.

I put in new plugs , properly gapped. Added a new fuel filter. Is there some other component that might be ageing that I can replace to ensure I get quicker starting. I assume it will get worse over time.

 

[parrisw]

Re: Slow starting 150 Johnson

Is that motor EFI? If not sounds like your choke is not working.

 

[levittownnick]

Re: Slow starting 150 Johnson

I have a similar thread from 9/19/09 (hope this ain't considered a hijack). I discovered if I check spark during the initial start attempt, there is No Spark, but after I've been fooling with it for a while, there is spark. My Speculation is that I'm flooding it because there is no spark, then later on when I checked for spark there was spark but it wasn't starting because now it's flooded. Took the black wire off the ignition switch and it started right up!!! The next time removing the wire didn't help??? I hope this helps, if it does, let me know.
Good luck

 

[Chris1956]

Re: Slow starting 150 Johnson

Have you checked the fuel primer for proper operation? When you activate the primer (push the key in or hit the choke button), it pumps mixed fuel into the manifolds, to assist with cold starting.

You can pull off the primer hoses and check to see if it sprays. The hoses are located on the outside of the carbs, between the top and middle carbs on each manifold. If you dont see fuel sprayed when priming, you might check the solenoid and wiring for the primer.

 

[Silvertip]

Re: Slow starting 150 Johnson

Are you squeezing the primer bulb until firm before attempting to start the engine? Do that first. Then turn the key to RUN (not start) and push in on the key for a count of 8 to 10. Now turn the key to START. Be prepared to bump the key in (prime) a time or two if the engine tends to die. NOTE: This process does not work unless you have squeezed the primer bulb to fill the carbs and create some fuel pressure first. Cold start, and very often hot start problems are operator error and not an engine problem.

 

[kenmyfam]

Re: Slow starting 150 Johnson

Agree. Correct starting procedure is vital.