restarting a johnson 150 after already running

MarcG007

Cadet
Joined
Jan 20, 2008
Messages
17
Hi all, i got an 89 johnson gt150. only ran the boat& motor 3 times to date.

new vro, carb rebuild,new ngk plugs (think they are br7hs-10's), new fuel & oil filters, fresh gas, no water visible in float bowl drainage. 95psi & above on each cylinder. replaced EVERY Kwik clamp, no fuel or oil leaks. gas tanks anti syphon working properly.

Shes takes abit from a cold start to start. new 1000 cranking amp battery, she turns over plenty fast.

i prime the bulb till rock hard, 3/4 throttle idler advance, hold the key in for primer and in 3 or so seconds of motor turn she'll pop. But then it will fire one pop die, fira a pop & die, pop die , pop die, etc, atleast 12-15 times. over and over till finally i get a 2 second rev. then shell start and stay running.


i can then go for a 45 min ride, stop, and i can immediately restart the motor with a half of a starter turn, bam, fires right up. if i sit for 20 min then try to restart it takes a 4-5 tries, same 3/4 fast idle, give a 1/4 squezze to reprime the fuel bulb, key pushed in to prime. takes 15-20 seconds to start.

Now after that 45 min ride, if sit for 1hr, it will take almost 60 seconds to restart, same thing as if from a cold start. even thou the motor is still nice & warm, pop die, pop die, pop die, 1 seocnd of fireing, 2 seconds of firing.


why the pop die, pop die, every pop i have to wait for the starter to wind down again and attempt to restart.

Any thoughts or personal experience's ?

Also, on the primer solenoid, where should the red valve be pointing towards? is this some type of restriction valve for the primer? i pulled the top carb primer feed, turned it over with primer activated and gas is flowing from the primer line. But is there such thing as too much primer feed? my red valve is turned all the way clockwise, pointing at about 8 o'clock. turning the valve counter clockwise restrict primer flow? couldnt find the adjustment in service manual.

thanks all and be safe.
 

kenmyfam

Supreme Mariner
Joined
Aug 10, 2006
Messages
14,392
Re: restarting a johnson 150 after already running

This is just personal thoughts from my motor.
Prime the bulb
Key prime from first thing in the morning cold start. Just a hint of cold start throttle and release key prime after about 1 second and she fires right up.
From there if stopped for a while (20 minutes or so) it will just fire straight back up with a twist of the key and no key priming. Same thing usually for up to a couple of hours without running. I only prime the bulb again if sitting for around 4 hours or more.
You may be flooding your motor by overpriming.
Just a thought and possibility.
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: restarting a johnson 150 after already running

primer should be in this position, red lever inline and back over the body. this is normal position, any other allows the gas to flow thru, and flood the motor. and should only be used for cold starts. if you have to use it for warm starts, you have another problem.
 

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MarcG007

Cadet
Joined
Jan 20, 2008
Messages
17
Re: restarting a johnson 150 after already running

kenmyfam & tashasdaddy i appreciate the replies. After reading your replies i've realized my errors.

I believe i was activating the primer later on when not needed, thank u for helping me realize. it makes sense now. Especially because of any 2 stroke knowledge. Flooding is always within reach.

I was still holding the prime after the first pop, when i should have not, flooding the motor.

I have changed the plugs since, i know at least one or fouled after last trip. My low idle was a sure give away.

tasha i will move the prime valve to position noted in picture, pointed center down to bottom solenoid. It was at 8oclock(maybe 9, full flow), center down would now seem 1/2 flow compared to full clockwise where it was. makes sense.

thank you for the info. I appreciate it. Hate getting that feeling out there; will she start?

thank u & b-safe
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: restarting a johnson 150 after already running

"Hate getting that feeling out there; will she start?" every one does.
 

nu2boatn

Recruit
Joined
Feb 14, 2008
Messages
1
Re: restarting a johnson 150 after already running

MarG007,

I have the same motor and the same problem. I too have rebuilt and replaced all of the parts you listed. I also had a new powerpack installed. I am going to check the overpriming possibility. If you solve your problem please post the method you used. Thanks.
 

hidef

Lieutenant
Joined
Aug 22, 2009
Messages
1,465
Re: restarting a johnson 150 after already running

Please start a new thread as this one is 3 years old.
 
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