Where to find a compression tester for a 86 9.9 Johnson?

[digitalkreation]

Hi all,

 

I want to give my motor (1986 9.9HP Johnson) a nice checkup and have just received my TinyTach in the mail. I want to also check compression, but am not wanting to waste time in getting the wrong one. Can I find a decent one at Princess Auto or Crappy Tire? I know that outboards sometimes have a weird size plug (different from cars), so if anyone has one for a small Johnson, could you steer me to a place to pick one up?

 

Many thanks,

Mark

[DRIFTER_016]

Canadian Tire does have them. This one also comes with the press fit rubber fitting.

 

Compression Tester

 

You can also go to NAPA.

[BITEME]

Canadian tire they have threaded adaptors in different sizes included dont get press fit rubber

[DRIFTER_016]

Canadian tire they have threaded adaptors in different sizes included dont get press fit rubber

 

The one I posted has the threaded adapters as well as the press fit rubber and should fit any engine.

They also have a kit with only the threaded adapters that you can purchase and return if the adapters don't fit.

[Whitespinnerbait]

1986 9.9 Johnson Compression test ????

 

That motor is not even broken in yet...Should be good for a Million hours before a compression test is required

[DRIFTER_016]

1986 9.9 Johnson Compression test ????

 

That motor is not even broken in yet...Should be good for a Million hours before a compression test is required

 

All true especially if he is the original owner and knows it's history.

There are many things that could affect compression including a cracked reed valve, cylinder scoring from wrong fuel mixture or overheating.

A simple compression check will let him know if all is ok. Peace of mind is worth $50, no?

[Tybo]

When buying a cheap gage, Expect cheap results.