Old Outboard Motor - First Look & Compression Test 1969 6hp Johnson SeaHorse

Here's my NEW - vintage outboard engine - a Johnson 6hp outboard motor from 1969 and doing a cylinder compression test to see if this old 6 horsepower outboard engine has enough compression in the two cylinders. This old outboard boat engine is a two stroke boat motor and essentially identical to a two stroke 1965 Evinrude Fisherman 6 hp outboard engine and is well suited for small boats like 12 and 14 foot boats.
This old 2 stroke outboard is very good shape for being over 50 years old and these old Evinrudes and Johnson are still quite easily found and easy to get parts for!
You can buy a compression test gauge kit here: amzn.to/3LZsPv6
As an Amazon Associate I earn a small commission from qualifying purchases.
00:00 Introduction
00:21 Taking a look at a 1969 Johnson 6hp Outboard Motor
03:00 The 3 things a gasoline engine needs to run - Compression, Spark & Fuel
04:00 Pulling the spark plugs out of the Johnson 6 hp Outboard Engine
05:20 Compression test on the old Johnson 6 hp outboard motor
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#johnsonoutboard #outboardmotor #compressiontest
Sound effects and additional music is copyright free from iMovie

[@gillgetter3004]

Got one last year from neighbor, hard used in marsh for duck hunting!! Was his grandpas forty bucks. Took it completely apart power head everything. Good thing I did all cooling passages blocked with sand. Rebuilt and replaced everything possible, still needs recoil spring if I can find it. Runs good it’s a 1971. Many many hours working on it but I’m retired and gives me something to do I enjoy👍

[@gillesgomez3091]

That's a good start. Looking forward to watch the following video about this small engine

[@daveskoczynski3717]

70psi on that motor is perfectly fine. They weren’t high compression from the factory. I have refurbished well over 100 of those little 6hp Evinrude and Johnson’’s and they run fantastic on 70psi. In fact the best I have seen from those is 80psi. Those little 6’s are not fast but they run forever. Nice find!!

[@FallinWolf1]

Hello is there any way i can contact you

[@tacticaladvance]

You will get a little more once the fule/oil seals the rings.

[@robbie_rebuilds]

That Lone Star boat is a gem. I’ve restored a couple fibreglass models (there story as a company is video worthy) and they have many beautiful designs

[@dougaranda6187]

I got a 1975, 4 horse Johnson going this summer, and it started out with 50, and 58 psi compression. After getting it running and enjoying it for a few trips, I checked again and both were now 85 psi. I did run Seafoam in the gas since it was a long dormant motor.

[@WayneTheBoatGuy]

Nice!

[@JamesSmith-wy7zk]

I have the same motor but is 1966. My compression was in the 70’s as well. Once you get it running, run some fuel with Marvel Mystery oil and test compression at normal operating temp. After I did that my compression went to the 90’s. All the best, Jim from Georgia

[@WayneTheBoatGuy]

Nice!

[@EastKYEDC]

@@WayneTheBoatGuy I have a 79 Johnson I believe. It’s a 6hp also it has 70-68 psi on compression check fires right up needs carbs cleaned but I figured that would be plenty of compression on a little motor like that. Don’t you think?

[@All_A_Guy_Needs]

I ended up buying 4 different compression gauges until I found one that read correctly. Congrats on the motor Wayne! She’ll serve you well. I bought a 1968 that could be this one’s twin over the winter. Can’t wait to get it out

[@WayneTheBoatGuy]

Yeah the cheap ones seem to be pretty inconsistent

[@AmyVinewood]

I got a 70' that if I sat it down next to his (besides the slightly different graphics on the cowling) they would be hard to tell apart. The green goes so nicely with the "jon boat green". One of the best colors out of the 6hp's run in my opinion. Good luck with yours!

[@gearbanger57]

I had an older Evinrude 4hp that came with a boat I bought. Compression was 60 on both cylinders, less than ideal by what most say. Engine started easy and ran great, I sold that to a buddy of mine 10 years ago. It still runs fine and is still at 60psi but, I do like to see higher numbers than that.

[@WayneTheBoatGuy]

It's funny because some people say they won't run at all below 90 or 100 - and then I hear your story - 60 psi is pretty low!

[@All_A_Guy_Needs]

In my experience low psi will run just fine. They’re just slower

[@BurchellAtTheWharf]

1:45 looks like it was only ever in the freshest of fresh water, not one lick of salt evidence anywhere

[@hammer9856]

That looks like a top find... It looks almost new. May need some parts replaced (fuel pump, water pump impellor), the carb cleaned. gear oil changed. and some other work cause it sat so long, but that is to be expected. But at this point I'd squirt some lube in the cylinders, put the muffs on, hook up some gas and see if she runs.

[@JCinematic]

Hi Wayne, what compression tool do you use? I am after a reliable tester for my outboards.

[@Fljeff7]

Best tested if engine has some running temperature to have the engine at expanded fittings of cylinder rings etc

[@AB-bg1or]

Shoot a little two stroke oil in the cylinders. Those compression gauges are also notorious for not being accurate; especially the Harbor Freight models.

[@WayneTheBoatGuy]

That's why I am not very concerned with it only being 70

[@JCinematic]

70 is not bad tho Wayne. I am sure if you get it running that compression number will soon climb as engines I know understand do not like sitting. Starting them on a monthly basis keeps them sweet and flushes out old fuel.

[@Dreancaidi]

Nice engine! Did you get it started?

[@WayneTheBoatGuy]

I did not - it did get started by it's new owner though.

[@dannybuendia1550]

i have a 1980 7.5 hp johnson , does it matter what two stroke oil i use ? i got a tw3 oil

[@BD-oo6ru]

Yes - there is a difference between 2 stroke oil for air cooled and water cooled engines. TCW3 is rated for water cooled engines like your outboard.

[@gillgetter3004]

Rebuilt several outboards small ones lawnmowers snoblower generator etc small engines never took compression test? Just pulled cord you can feel it? Dad taught me that on old reel mowers

[@WayneTheBoatGuy]

Yeah in the past I never did these either!

[@randy1ization]

wayne,, my 9.9 has 70/80 psi compression,, but no suction to pull fuel thru the carb,,, ant ideas?

[@timothyproksch2915]

The outside of the fuel lines don’t count you have to look at the inside. I’d just replace them at least

[@WayneTheBoatGuy]

good point!

[@BurchellAtTheWharf]

75 psi is kinda low, might get 4-5 knots in a ten foot boat, more psi mean higher rpm under load which means more speed

[@WayneTheBoatGuy]

Yeah - it might come up once I get it running again - but I’m not expecting too much - and I’m not too worried about speed

[@barrywarren4221]

I use a 1988 6 hp Johnson (Belgium) on my 14ft. aluminum, it flies up the river.

[@WayneTheBoatGuy]

Nice!

[@markmoffett6813]

Hello Wayne , Selling my 14' aluminum V hull. I know you have a yard full of boats , but I wanted to give you first dibs before I advertised it GREAT deal for you if you are interested Mark from Maryland Harford county

[@WayneTheBoatGuy]

Hmmmm - Is it much different than my 14 ft. Lone Star?

[@markmoffett6813]

@@WayneTheBoatGuy I would like to send you pictures. I want to keep the trailer. This boat is in very nice condition along with two new seats , seat mount , anchor , etc I keep in the house never used

[@independentthinker8930]

70, but it's a "dry" engine

[@WayneTheBoatGuy]

Yeah - when it gets running I should retest for fun to see what changes.

[@Fljeff7]

@@WayneTheBoatGuy yes