Results 1 to 5 of 5
  1. #1
    surfernerd's Avatar
    Join Date
    Jul 2014
    Location
    Nashville, TN
    Posts
    2

    Question 2003 SeaDoo RXDI correct spark plug?

    Good evening all, my first post. I recently acquired a 2003 SeaDoo RX-DI with nothing wrong and running great. Low hours and no damage. I was tearing it down for basic maintenance this week and came across something interesting. The spark plugs are NOT what SeaDoo recommends. I found NGK V4 Power spark plugs ins there, model 5155. According to everywhere I've seen and the service manual, it should have NGK BR8ES, model 5422. In holding the two up to each other, there are significant differences. Did the previous owner just idiot it, and I should replace them with the correct 5422 or should I just replace them like for like as it runs fine as far as I'm aware. Here's a side by side. Different socket size, different head gap, different cap.
    Click image for larger version. 

Name:	DSCN6633.jpg 
Views:	229 
Size:	99.0 KB 
ID:	336857Click image for larger version. 

Name:	DSCN6634.jpg 
Views:	229 
Size:	105.6 KB 
ID:	336858Click image for larger version. 

Name:	DSCN6635.jpg 
Views:	76 
Size:	97.5 KB 
ID:	336859Click image for larger version. 

Name:	DSCN6636.jpg 
Views:	107 
Size:	79.8 KB 
ID:	336860


  2. #2

    Join Date
    Mar 2006
    Posts
    1,833
    +1
    119
    NGK ZFR4F-11 is the NGK plug type for your machine. The 3961 (solid terminal of 5422) is for MOST all carberated seadoos and is not correct for your di.

  3. #3

    Join Date
    Jul 2009
    Location
    Fort Worth, Texas
    Posts
    305
    +1
    18
    I have owned a DI since 2003. I use the Champion plug which seems to work much better than the NGK. There were many NGK plugs in the 03-04 time frame for the DI that had bad porcelain insulators. They would start shorting out preventing rpm above 5500. I have never had a Champion fail. I don't remember the Champion #, but you can cross reference it until I can post. NGK may have the problem fixed, but I have just stayed with the Champion.

  4. #4
    surfernerd's Avatar
    Join Date
    Jul 2014
    Location
    Nashville, TN
    Posts
    2
    Quote Originally Posted by Team Bilford View Post
    I have owned a DI since 2003. I use the Champion plug which seems to work much better than the NGK. There were many NGK plugs in the 03-04 time frame for the DI that had bad porcelain insulators. They would start shorting out preventing rpm above 5500. I have never had a Champion fail. I don't remember the Champion #, but you can cross reference it until I can post. NGK may have the problem fixed, but I have just stayed with the Champion.
    I appreciate the input. Typically I'm a Bosch spark plug guy, but I don't think they make them for the ski. I don't intend to hold this ski forever. I've ridden them my whole life as Florida beach kid, but never owned one. If this one holds up and runs how I want it do, I'll probably invest in a long term RXT further down the road. If the NGK hold up one season, it's $4 well spent. In terms of long term use, would the Champion's run longer?

  5. #5

    Join Date
    Jul 2009
    Location
    Fort Worth, Texas
    Posts
    305
    +1
    18
    The Champion plug is RC12MC4, .043 gap. Most folks change the plugs yearly, but only change the plugs in their car every 100K miles, LOL. I change mine every few years on my DI, yearly on my carb model. I have never had a Champion fail, but the plating is thin and they will start to rust on the base. The DI was known as a "plug eater" in the early days, but it was NGK fault, not the engine.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Correct spark plugs for 2001 Virage TXi ?
    By jlt31971 in forum Polaris Open Discussion
    Replies: 5
    Last Post: 08-24-2017, 03:52 PM
  2. 2003 SeaDoo RXDI Info Center Issues
    By SOBX in forum 2-Stroke Performance
    Replies: 7
    Last Post: 11-26-2015, 11:25 PM
  3. 2003 SeaDoo RXDI Stopped Running
    By SOBX in forum 2-Stroke Performance
    Replies: 3
    Last Post: 11-25-2015, 11:27 AM
  4. Correct Spark PLugs for MSX150
    By steelroe in forum MSX/Matrix
    Replies: 2
    Last Post: 08-10-2010, 06:35 PM
  5. what's the correct spark plug gap for 1999 ultra 150?
    By screamindemon in forum Kawasaki PWC Performance (2-stroke)
    Replies: 1
    Last Post: 09-30-2009, 06:09 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
  •