Compression Testing Problem

[GeorgiaMan]

hello i got a 05 50 hp mercury outbourd , I am wanting to do a compression test on it and I am needing to know what size adaptor do I need for the mercury spark plug holes..I am thinking a 12 mm or 14 mm adaptor can anyone let me know thanks ....

 

[aussieflash]

Re: Compression Testing Problem

Most testers come with size adaptors.Stick it in and see.

 

[86 century]

Re: Compression Testing Problem

The cheep one from autozone has all the adapters I have ever needed.

 

[catfishr1]

Re: Compression Testing Problem

Yep ;I too use the cheap one frm Az & always have adapter needed. Welcome aboard GM. Make sure you ground spk plg leeds before the test.

 

[jerryjerry05]

Re: Compression Testing Problem

Most testers are ready to use on all outboards right out of the box.