Page 1 of 2 1 2 LastLast
Results 1 to 10 of 15
  1. #1
    Kristian Keppel Waterholics's Avatar
    Join Date
    Apr 2010
    Location
    Trinidad & Tobago
    Posts
    1,405
    +1
    38

    Spark Plug Analysis Help !

    I just pulled my plugs at 50 hours to change them. I can definitely see cylinder# 2 and 3 is running leaner than 1 and 4. But what I'm really concerned about is that cylinder 1 spark plug has no rust while 2,3 and 4 all have really bad corrosion. Is this normal to have corrosion on plugs? I always flush my ski after every ride. What could be the cause of this ?

    Click image for larger version. 

Name:	img1103nh.jpg 
Views:	567 
Size:	276.6 KB 
ID:	288187


  2. #2
    I would say your coil not sealing good.

  3. #3
    jamiggs's Avatar
    Join Date
    May 2012
    Location
    Belleville, Ontario, Canada
    Posts
    25
    Quote Originally Posted by Waterholics View Post
    I just pulled my plugs at 50 hours to change them. I can definitely see cylinder# 2 and 3 is running leaner than 1 and 4. But what I'm really concerned about is that cylinder 1 spark plug has no rust while 2,3 and 4 all have really bad corrosion. Is this normal to have corrosion on plugs? I always flush my ski after every ride. What could be the cause of this ?

    Click image for larger version. 

Name:	img1103nh.jpg 
Views:	567 
Size:	276.6 KB 
ID:	288187
    Are you running Yamaha Ring Free additives in your fuel in every tank?

  4. #4
    Moderator beerdart's Avatar
    Join Date
    Aug 2006
    Location
    CT
    Posts
    25,929
    +1
    1,407
    The bottom of your seat is dripping water onto the valve cover.

  5. #5
    Quote Originally Posted by beerdart View Post
    The bottom of your seat is dripping water onto the valve cover.
    and leaking by the coil thats not sealed good.

  6. #6
    lets race.... mikeFZR's Avatar
    Join Date
    Mar 2009
    Location
    MA
    Posts
    4,132
    +1
    205
    +1 on the coil not being seated well. Any rust is bad IMO.

  7. #7
    Olomana's Avatar
    Join Date
    Jan 2011
    Location
    Tahiti, French Polynesia
    Posts
    1,414
    +1
    76
    This happen when you wash your engine, water get trap on top of spark and start to rust.
    You need to apply some dielectric grease to seal it properly.
    Yamaha pencil coil does not seal well, I have seen that on a lot of different yammy pwc.

  8. #8
    AWA MEMBER
    Join Date
    Jan 2008
    Location
    Currituck, North Carolina, United States
    Posts
    4,616
    +1
    247
    They should make the base out of stainless for a marine application. I saw a iridium version of our plug on ebay and it was stainless steel base.....direct replacement? I'd use anti seize also those threads look dirty and rough

  9. #9
    This is my place of Zenn smohammed's Avatar
    Join Date
    Oct 2009
    Location
    Trinidad & Tobago / Broward FL
    Posts
    264
    +1
    1
    this same thing use to happen to me when i had my VX. it happen while washing down the engine and the water leaked through the coils. next time wen changing plugs apply some sort of seal on it. for a quick fixes i used petroleum gel on the go but it would eventually dry up. wen washing the head of the engine take a damp cloth and wipe around the coils instead of spraying them with water.. after jus spray the yamaha silicone protect spray on it

  10. #10
    AWA MEMBER
    Join Date
    Jan 2008
    Location
    Currituck, North Carolina, United States
    Posts
    4,616
    +1
    247

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Please look at these Spark plugs, opinions HELP
    By jwaked in forum Yamaha PWC Performance (4-stroke)
    Replies: 8
    Last Post: 08-21-2014, 09:08 PM
  2. 97 GTX spark plug read help
    By wjholt in forum 2-Stroke Performance
    Replies: 1
    Last Post: 07-03-2014, 12:28 PM
  3. need spark plug for race this weekend! help
    By born riding in forum Kawasaki PWC Performance (4-stroke)
    Replies: 4
    Last Post: 06-15-2007, 02:23 PM
  4. I need some spark-plug analysis:
    By JP in forum 4-Tec Performance
    Replies: 58
    Last Post: 03-29-2007, 08:15 PM
  5. SPARK PLUG INSTALL HELP!!!
    By Totallyblown in forum 4-Tec Performance
    Replies: 2
    Last Post: 04-11-2006, 05:57 PM

Posting Permissions

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