Results 1 to 7 of 7
  1. #1

    NOT a pwc.. a mercrusier BUT im hoping for some help with this plug!

    this plug came out of a 4.3 v6 mercrusier..

    long story short , its a boat that was given on exchange for a job and the guy had reciepts that it was winterized and stated it ran good..

    we got it out there after checking basic stuff like oil ect and after warm up it ran like crap.. backfiring ect... we decided to change the oil/gas and plugs..

    well this is the FIRST plug we pulled out.. what would cause this????????
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	plug.jpg 
Views:	163 
Size:	112.1 KB 
ID:	271459  

  2. #2
    hitman's Avatar
    Join Date
    Aug 2006
    Ft. Lauderdale, FL
    Something very not good.

  3. #3
    Whats that whistling noise? jtskier11's Avatar
    Join Date
    Sep 2007
    Right side of Kansas
    That looks almost like electrolysis. Other plugs look the same???

  4. #4
    Olomana's Avatar
    Join Date
    Jan 2011
    Tahiti, French Polynesia
    Can you post the S/N of the engine.
    It can be either:

    Never change the sparkplug...
    Lot of load on the engine (bad propeller size)...
    Overheating cause by bad spark plug heat range...

    How the other spark look like?

  5. #5
    fx160's Avatar
    Join Date
    Nov 2005
    gold coast australia
    to me it looks like it has been in way to long
    but i suspect it is something more than that
    it may have been rusty after being left for a long time and all the rusty stuff has burnt away

  6. #6
    TJBrad04's Avatar
    Join Date
    Dec 2005
    Flowery Branch, Ga
    Do a compression test and go from there. It's either going to use that BPR6EFS or a BR6FS most likely. Your serial number will seal the deal on that one. If the flame arrestor is gone, it will be on the stbd side of the block, above the starter on a rivited metal tag.

  7. #7

    Join Date
    Mar 2010
    the moon
    check your inlet manifold studs, i seen something similar on a v8 in a boat and the studs had corroded and was leaking salt water onto the plugs.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Im totally at a loss with this Ski - dont know what to do
    By XDAILY in forum 4-Tec Performance
    Replies: 72
    Last Post: 06-16-2014, 08:19 AM
  2. Replies: 43
    Last Post: 12-28-2013, 01:20 PM
  3. This forum has inspired me but i'll need some help...
    By fuller07 in forum Yamaha Old School Skis
    Replies: 5
    Last Post: 03-22-2012, 04:43 PM
  4. not really PWC but holeeeee
    By rampager in forum Sea Doo Sport Boats
    Replies: 32
    Last Post: 05-06-2009, 12:16 AM
  5. Well not a pwc project but see if u like
    By bling bling in forum Open Discussion
    Replies: 14
    Last Post: 01-25-2007, 09:19 AM

Posting Permissions

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