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Old 22 March 2016, 17:44   #1
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What compression on 2 stroke 3hp?

I'm shopping around for a 2 stroke Mercury/Mariner/Tohatsu in the 2.5-3.5hp range. When the time comes and I find one, what compression level should I be checking for? With just the one cylinder, I won't be able to compare and contrast!

Thanks.
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Old 22 March 2016, 17:48   #2
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I won't be able to compare and contrast!

Thanks.
Buy two.
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Old 22 March 2016, 17:52   #3
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Buy two.
Thanks. What makes it worse is that I know that you know the answer!

Anyway - not like you to recommend twins?

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Old 22 March 2016, 18:03   #4
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The Mollers Guide to 2st Tiddler Buying.

Scan the bloke's garage/shed for boaty bits.

Give the thing a good coat of looking at.

Shove it in a dustbin half full of water, get the yer man to hold tight and you give it a good tug (there's ya comp test).

Let the tell tale piss over his trousers and knock it in and out of gear. Try to avoid smacking the bottom out of the bin when in gear, I've done it.

If all good, offer him half of what he's asking.

Don't get the comp tester out, you may risk getting you're arse kicked down his drive.

Feel free to use this in the Ribnet FAQ section.
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Old 22 March 2016, 20:20   #5
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Standard or long shaft? Just say the word and I'll put the hounds on the scent of 2-stroke oil.
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Old 23 March 2016, 05:03   #6
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I'm shopping around for a 2 stroke Mercury/Mariner/Tohatsu in the 2.5-3.5hp range.

Thanks.
Think I have just the thing you need . PM sent
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Old 23 March 2016, 05:16   #7
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>>>Shove it in a dustbin half full of water, get the yer man to hold tight and you give it a good tug (there's ya comp test).

Hah ha that's what I thought looking at this last night. I never bother to comp test an outboard of 4hp and under... or a mower/strimmer/hedgecutter/genny/water pump etc.

Decent cold start... no excess smoke... hot restart OK... that's about if for me.
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Old 23 March 2016, 06:46   #8
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Please Sir..i think I know the answer ... or at least my workshop manual does .

Below is passage from my Mariner 3.3hp 2 stroke manual.

Best wee engine I have owned..its a 2005 model so should have many more properly compressed strokes

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Old 23 March 2016, 08:37   #9
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OK guys - thanks for all of those replies!

I have a unit to look at tomorrow, so I'll approach it with a multi discipline approach. It's a bit on the geriatric side, so I'd be a little concerned about cylinder damage - multiple owners/users and all that

If she checks out by the Mollers/Fenlander list, I can always do the deal but pop the tester on before handing over the readies if I'm still concerned. She'll be warm at that stage anyway. I have a bin and fresh two stroke mix ready - so he'll have no excuses

Kawasaki, you have PM.

Spartacus - hold the dogs for now (thanks tho). I've had a couple of leads on UK based units but have to factor in the hassle/cost of shipping to Ireland. The usual suspects will not ship O/Bs by air, so have to use a palletised outfit like Codshift. Runs to over 100 which sours a deal on an older motor. I can buy one brand new from offshore but I really can't justify the cost for limited use I have for it.
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Old 24 March 2016, 17:37   #10
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So I went for a drive today. A 240 mile drive. During it I met a bloke who was selling the 3.5hp Tohatsu that prompted this thread. The wee engine was very clean (for it's currently undetermined age - but obviously 2005 or older). I suspect that it was used in fresh water - it lived in lake country. There is zero corrosion on it. It started, passed water and engaged gear. I decided to take Moller's advice and leave the snap-on tools in the back of the Isuzu I'll get a better look at it tomorrow, but I suspect that a home service and bit of loving will reveal it to be a keeper.

Oh yeah, and he charged me a euro a mile for it.
That's 190 in Queen's Money...

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