Get instant online access to repair manuals for your Mercury / Mariner outboard. Online Manuals
Order printed Mercury / Mariner service manuals — shipped to your door! Printed Manuals
Use engine diagrams to find & order parts for your Mercury / Mariner engine. Engine Diagrams
Find parts quickly with Mercury application guides. Quick Parts Guide
Results 1 to 3 of 3

Thread: 20hp4stroke bog

  1. #1

    Default 20hp4stroke bog

    Hello Iím new to this so here goes, I have a 08 20hp 4stroke as a kicker on my 23 Ď pontoon, it runs great with earmuffs but in the water pushing the boat it has a nasty big the hole time and fowls plugs any help would be appreciated thx

  2. #2
    Join Date
    Mar 2019
    Ottawa Canada

    Default Re: 20hp4stroke bog

    check to see if its sparking on both cylinders first.

  3. #3

    Default Re: 20hp4stroke bog

    It may well be carbon build up on the rings,,,causing poor compression One can of Mercury Powertune sprayed into the Carb might take care of it.... it is a fairly inexpensive something to try (around $12) before taking it in for service....follow label directions

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts