Jump to content

Recommended Posts

I did a compression test on a motor I'm planning on buying, a 2006 Mercury 50hp 2stroke oil injected. I got 120PSI on all 3 cyl.

I'm not a big expert on motors so, I'm wondering what that means? 

Still good? Enough life left for a few summers? Needs rebuild soon?

Thanks in advance for advice!

Share this post


Link to post
Share on other sites

As mentioned above I too would be looking at the difference between cylinders as my guide. That's because there's a hundred different ways to measure compression (only one right way), so the difference between them is key as long as you do it the same way each time.

Share this post


Link to post
Share on other sites

my limited research when looking for my own used outboard recently said that 110 is solid compression so 120 should be  great. 

 

As mentioned you dont want variation because in my very limited knowledge, different compression means that your cylinders would be working at totally different air to fuel ratios and be combusting at different rates, Jeez i think on a non fuel injected engine this may even throw off timing (i might be talking out of my you know what?? which in my understanding can cause certain cylinders to start taking additional load and I imagine create even larger variances until your engine totally goes.

Edited by AKRISONER

Share this post


Link to post
Share on other sites

You have excellent compression. I would also look for a strong stream from the cooling overflow also known as the pisser and the overflow water should be cold.

Share this post


Link to post
Share on other sites

I would think that's a pretty fair price.. maybe even on the low side of things. Outboards aint cheap. 

I have a 2009 50hp and love it.. great motor.

Edited by boombap

Share this post


Link to post
Share on other sites
1 minute ago, boombap said:

I would think that's a pretty fair price.. maybe even on the low side of things. Outboards aint cheap. 

I have a 2009 50hp and love it.. great motor.

I know. Was hoping for a 4st but couldn't find anything under $4000

Share this post


Link to post
Share on other sites

a 50 for 2,500...depending on how much it got used...id say thats a solid deal man. Outboards aint cheap at all, and a 50 will get a lot of boats around really well.

Im slightly wary of mid 2000's 2 strokes from when the new emmissions standards took over requiring direct injection rather than carbureted 2 strokes of the late 90's...im sure it will be fine though.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

  • Similar Topics

    • Outboard gas issues

      Hey guys.    I recently picked up a 9.9 Johnson to work on over the winter as a project. Was sitting for 2 years but didn't have any issues starting it up.  New gas and it fired up.  But it's dying after 2 mins so.   I pulled out the line from the pump to the carb and no fuel was coming out when running so it must be the fuel pump.   Just bought a new one instead of rebuild.  This is still not working. I took out the gas lines to see if any were clogged but they weren't.   Any ideas?   When

      in General Discussion

    • Mercury outboard

      Hey everyone, I am trying to see some opinions about a 2014 Mercury 25 hp 4 stroke outboard motor...the owner says it has around 400 hours of operation.  But runs good...to me it sounds like high hours...what you guys think? Thanks!

      in General Discussion

    • Outboard motor on my canoe

      I have an Esquif Propector 16 Royalex. I have moving water /rapids that I need to move up. On my GPS in was clocked doing 18 Kms going down them.  My canoe is rated for 1000 lbs.  I want to add an outboard. Esquif says 2 hp rating for the canoe.  I’m thinking a 4 hp will be enough to push we up the rapid.  The 4 hp is 60 pounds.  The canoe is not a flat back.   Im looking for some insight on mounting, if it should be mounted on the side or back.  Do you think it will have enough thrust to m

      in General Discussion

    • 2010 Lund Rebel 1625 XL w/ 2010 60 hp Yamaha outboard

      View Advert 2010 Lund Rebel 1625 XL w/ 2010 60 hp Yamaha outboard **I am selling this boat for my dad.  If you are serious and want more information, send me a PM and I will send you his number.  Boat is located in Port Perry area** Included in the package: Lowrance Hook 9 sonar/chartplotter in the back Humminbird Helix 5 sonar/chartplotter in the bow Minn Kota 70 lbs thrust 24 v trolling motor on the bow w/ on board charger (batteries less t

      in Boats, Motors and Supplies

    • Help? Outboard Motor Cowl Sticker Installers??

      Hello  I purchased another cowl decal for my outboard as the old one was peeling and flaking  I purchased a new one, which is $125 in the trashcan as I can’t install it myself-bubbles, ripples , wasn’t straight ......im done.  Clearly it’s beyond me to install. i would like to purchase another sticker, but I 100% cannot do it myself.  One of the issues is that it is large, covers 3/4 of a 115hp cowl hood. does anybody know of a marina or installer who could do something like

      in General Discussion

×
×
  • Create New...