Compression test

[danberlin]

I'm planning on doing a compression test on my 97 Johnson 150 (not ficht).<br />The compression tester I bought has instructions for a car engine and says you need to ground the wire from the coil.What is an easy way to do this on my motor? Is this something I even need to do?<br />Thanks,<br />Dan

 

[rodbolt]

Re: Compression test

hello<br /> I use a spark tester so I can control the spark on your motor you either need to ground the blk/yellow wire at the pack or unplug the pack from the stator. what you dont want is sparks occuring while cranking as air/fuel mix is sprayed out of the cyl's when cranking.

 

[DHPMARINE]

Re: Compression test

Leave the ignition key off,and jump the starter solenoid to crank,or use a spark tester.Spark should jump 7/16 of an inch cranking with the plugs in.<br /><br />DHP

 

[JC1933]

Re: Compression test

Couldent you just pull the kill switch? J C.

 

[DHPMARINE]

Re: Compression test

Yep,or leave the key off.Either way works.Kill switch works,but I use the key switch cuz I am also checking spark.<br /><br />DHP

 

[danberlin]

Re: Compression test

Thanks for the help guys I'll be doing it this weekend.