Johnson '86 40hp hard to start after shutting down

[ba_50]

After shutting down the motor, and trying to restart, it dies. This happens whether using idle lever or just starting. It doesn't sound like it is getting enough gas. I changed the throttle screw so it would run faster ( it shook a lot a low idle!) and adjusted the lever setting a tad but got the same results. There are no carb adjustments. It has new plugs.

Any idea what is causing this?

 

[AlanR]

Re: Johnson '86 40hp hard to start after shutting down

if u squize the bulb does it start and stay running

 

[JUSTINTIME]

Re: Johnson '86 40hp hard to start after shutting down

check vent/fuel lines
might need a carb rebuild

 

[tashasdaddy]

Re: Johnson '86 40hp hard to start after shutting down

check your spark, sound like it's dropping a cylinder.

 

[ba_50]

Re: Johnson '86 40hp hard to start after shutting down

There is spark to both plugs, squeezing the bulb didn't seem to help either. I have boths carbs soaking in carb cleaner in case the low speed jets are plugged or something else in there.

Preety sure it doesn't need a carb rebuilt. I wonder if linage could do it, although the former owner said he never had any problem with it.

 

[JUSTINTIME]

Re: Johnson '86 40hp hard to start after shutting down

Take them out of that carb cleaner
never soak marine carbs in carb cleaner

 

[ba_50]

Re: Johnson '86 40hp hard to start after shutting down

Why shouldn't they be soaked in cleaner?

 

[JUSTINTIME]

Re: Johnson '86 40hp hard to start after shutting down

the carb cleaners eat through the sealant the crb companies use to seal the carbs
here is it stright out of a manual

 

[ezeke]

Re: Johnson '86 40hp hard to start after shutting down

What manual is that from, Justintime?

It looks very much like the instruction in my 1990 manual referring to plastic carbs, just before the picture of the can of aerosol Gumout being used to clean the carburetor.

 

[JUSTINTIME]

Re: Johnson '86 40hp hard to start after shutting down

i forget which one, got it from school

never soak your carbs in cleaner


use power tune and srub away

 

[ezeke]

Re: Johnson '86 40hp hard to start after shutting down

Right.

Have a nice Thanksgiving.

 

[ba_50]

Re: Johnson '86 40hp hard to start after shutting down

Justintime,

Too late. What do you scrub them with and what do they use a sealant for? I took everything off that wasn't metal.

 

[ba_50]

Re: Johnson '86 40hp hard to start after shutting down

Justintime,

Maybe a better question is, do I need to have them resealed?

 

[JUSTINTIME]

Re: Johnson '86 40hp hard to start after shutting down

solvent tank, i do not soak though
if u do not have that i like power tune by merc/quicksilver

each manufacture has there own carb cleaner, the problem with auto carb cleaner is that it is too strong and will actually eat away at the carb sealer the factory puts on it

 

[Solittle]

Re: Johnson '86 40hp hard to start after shutting down

When you say that there is spark on both plugs how did you determine this? Your symptoms point to a dropped cyl.

 

[OBJ]

Re: Johnson '86 40hp hard to start after shutting down

There's a pretty good thread going on about soaking carbs. Take a look. Probably not the right forum to discuss this but.....

 

[ba_50]

Re: Johnson '86 40hp hard to start after shutting down

I started another thread on iboats about soaking if anybody is interested.

 

[ba_50]

Re: Johnson '86 40hp hard to start after shutting down

I checked the new plugs by using a device that goes between the plug wire and a ground. The spark jumped both gaps.