93 Johnson 15h died, won't start

[Shep83]

I went to boat and fired it up, started on 2nd or 3rd pull.
Idled while I untied and I took it for a little drive around the lake.
Ran for maybe 10 minutes and died..

Hasn't run since, won't bark anything...

I tried putting fuel in the cylinder, nothing,
I havbe a spark but it's not much..
"I'm trying to find a compression tester"

ANy ideas??? Anyone???

 

[Daviet]

Re: 93 Johnson 15h died, won't start

What do you mean by not much spark, will it jump a 7/16" air gap and is it bright blue?
A compression test is a good idea also.

 

[Shep83]

Re: 93 Johnson 15h died, won't start

I simply pulled a plug out to check the spark...
Didn't know about the 7/16" thing, spark is yellow and not strong (like lightning)

I guess I should stop focusing on what would cause it to stop and just start testing everything.

 

[jbjennings]

Re: 93 Johnson 15h died, won't start

You've already found your problem---weak spark. To properly test spark, go to autozone and get a $6 spark tester which will allow you to change the air gap that the spark has to jump. As said, it needs to have a bright blue spark that will jump a 7/16" gap. You will either have to change spark plugs, or if both sparks are weak, a powerpack. If only one spark is weak, I'd swap coils and see if the problem follows the coil. Test your powerpack with a meter to be sure it's bad---powerpacks are expensive!
I would also check compression, although it's very doubtful that is the problem.
Good luck,
JBJ

 

[Shep83]

Re: 93 Johnson 15h died, won't start

Did the compression test last night and the case is closed, she's blown up.

Top cylinder read 54# bottom cylinder was 0#

 

[boobie]

Re: 93 Johnson 15h died, won't start

Pull the cyl head and check it. It may be just a blown head gasket.