1990 15 hp Johnson won’t start, sort of sounds like it’s sucking air/leaking air

[jitterbug127]

I mean where the flywheel meets the woodruff key is that worn

Not at all! Looks good!

 

[David wright]

So as far as we know good compression good spark, carb all clean and all jets cleaned and no air leaks ? Is fuel new and right mix ?

 

[David wright]

Not at all! Looks good!

Can u show a picture of the choke on this engine

 

[jitterbug127]

Can u show a picture of the choke on this engine

I can do that!

 

[jitterbug127]

So as far as we know good compression good spark, carb all clean and all jets cleaned and no air leaks ? Is fuel new and right mix ?

I rebuilt carb 2 month ago. It has been used 3-4 times per week since. I’ve probably got 50+ hours on motor since carb was built. Fuel is less than month old, mixed properly, used the same tank and bulb I always do. No air leaks to note.

 

[David wright]

Also a thought you said the carb was rebuilt was the float switch set correctly so only fuel enters the carb before the float pin engages I have known Air to enter with incorrectly levelling to floats in carbs

 

[jitterbug127]

Also a thought you said the carb was rebuilt was the float switch set correctly so only fuel enters the carb before the float pin engages I have known Air to enter with incorrectly levelling to floats in carbs

I think it should be fine. I have used motors numerous times without fault since it’s been rebuilt. I could blow air in carb when it was right side up and the carb wouldn’t let me blow air in when it was upside down.

 

[David wright]

I think it should be fine. I have used motors numerous times without fault since it’s been rebuilt. I could blow air in carb when it was right side up and the carb wouldn’t let me blow air in when it was upside down.

Ok so im wondering whether the choke solenoid is stuck and letting in excess air without letting in fuel is yours a manual or an electric choke/primer valve

 

[jitterbug127]

Ok so im wondering whether the choke solenoid is stuck and letting in excess air without letting in fuel is yours a manual or an electric choke/primer valve

Manual choke, rope start

 

[David wright]

Manual choke, rope start

Ok have you tried the engine on choke only

 

[jitterbug127]

Ok have you tried the engine on choke only

Oh yeah. I get nothing. I even put it in drive/wot and cranked it with a drill. Nothing. I even sprayed carb cleaner in the carb to start, Nada

 

[David wright]

Even if you turn idle screw to full lean and prime bulb a few times to get the fuel to plugs ?

 

[jitterbug127]

I’ve tried 3 tanks, 3 hoses, full choke, no choke. Fuel in cylinders

 

[David wright]

Ok have you turned the idle screw to full lean and primed on choke only worth a shot just to try, if it starts it will use up fuel from choke and die out after 10 to 20 seconds

 

[jitterbug127]

Ok have you turned the idle screw to full lean and primed on choke only worth a shot just to try, if it starts it will use up fuel from choke and die out after 10 to 20 seconds

Will try this evening

 

[David wright]

Will try this evening

Let me know how it goes have a few more ideas to try and help

 

[racerone]

Learning how to start a motor.----learning how to diagnose a " no start " condition is a lost art.

 

[David wright]

Learning how to start a motor.----learning how to diagnose a " no start " condition is a lost art.

It certainly is and im just trying to help maybe what I'm saying will not help but just trying to help out a guy with his issues

 

[jitterbug127]

Learning how to start a motor.----learning how to diagnose a " no start " condition is a lost art.

Very true! That’s my goal with this experience to learn how to diagnose it. I’ve been through all the steps I know…
Compresssion check, spark check, make sure all my grounds are tightened, making sure I’ve got good fuel pressure in my bulb, making sure my plugs are not fouled. I’ve put fuel straight into the cylinders, I’ve tried starting in neutral, starting in forward, I had the choke all the way open, all the way closed. I pulled flywheel checked woodruff key, inspected the flywheel, made sure new clean fuel going into carb. I know I’ve mixed fuel right. I have 3 tanks and three hoses. I tried all of those, I changed our the fuel line connector on the motor. I even checked the screen on my fiel
Pump and put a different fuel pump on. Made sure no kinks in fuel line. I’ve got nothing so far for bark/cough.

 

[jitterbug127]

I’m a nurse by trade and completely self taught. My dads mechanical knowledge is pretty much 0. Most everything I do is trial and error or stuff I find on here. I’m trying to become more competent with every motor. I’m 34, so 99% of these motors are 20+ years older than me. None of my buddies know anything about these old 2 smokers. I’m stuck figuring it out for myself