Johnson Outboard Compression Chart – 40 hp thru 70 hp. 175 hp thru 300 hp. 70 hp johnson compression test. Compression is about 125 psi on each.

Higher horse power motors will require higher compression. To sort chart by column (year, model, etc) click on the desired column heading. As far as i have ever known. 25 hp thru 35 hp.

Johnson Outboard Compression Chart

Johnson Outboard Compression Chart

I got nearly 7bar / 100psi on one, and about 5.5bar on the. I have a mid 80's 70 hp evinrude here. Proper premix is what will keep a 2 stroke.

Here’s why and how it’s done. 60 psi is ok on low hp omc. Mercs also have higher compression than the johnson evinrudes etc.

25hp evinrude = great compression would be > 125lb, (but run and idle ok at 100psi) but 6hp evinrude = great compression would be >85 to 90psi most of the. Thanks f flyingscott outstanding contributor jul 13, 2017 #2 a. We did our compression test on a johnson 6hp outboard motor, but the same.

After going through all the key items and checks on everything i decided to check the compression. What is the compression for a 1974 johnson 65 hp outboard? Compression is somewhat okay, a bit low but its an old engine and who knows if its been taken care of or beaten on.

How to Test Compression on a Small Outboard

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