Page 1 of 2 1 2 LastLast
Results 1 to 10 of 16
  1. #1

    color spark plug

    Click image for larger version. 

Name:	IMG_0357.jpg 
Views:	773 
Size:	120.6 KB 
ID:	257098
    Is this to lean or rich. I think i hae a fuelproblem. My RXT-260 RS turn max 7500 rpm.

    Thanks
    Mike


  2. #2
    Mtuned's Avatar
    Join Date
    Aug 2010
    Location
    Orlando FL
    Posts
    724
    Thats to lean.. Fuel pump or FPR issue..

    mods?

  3. #3
    dnielsen's Avatar
    Join Date
    May 2008
    Location
    Shreveport, Louisiana
    Posts
    2,018
    +1
    94
    I would say from just looking the engine was running lean. The only way to get a good read on the plugs is to run it at WOT and pull the lanyard, pull the plugs to read by either towing back to shore or carry some tools with you to check on the water. Those plugs would look pretty normal if the ski is stock (stock fueling, ECU map, SC and etc.) and you idled back to shore in conjunction with the cooler weather most of us are experiencing. Cooler air equals more density, more density equals a leaner mix if you have no way to compensate (adjustable FPR, fuel controller). Most of us are now running some sort of AFR monitoring such as the Dynotunes, Zeitronix, or Innovate systems to be sure where our AFRs are at.

  4. #4
    I put a pressure gauge into the fueline. When the engine turn 1700 rpm the fuelpressure is 59psi. When the engine is accelerating the pressure drop to 44psi. Is this normal ?

    Mike

  5. #5
    R88ory RXP's Avatar
    Join Date
    Feb 2008
    Location
    Kent, England
    Posts
    2,737
    +1
    46
    Quote Originally Posted by mmvane2 View Post
    I put a pressure gauge into the fueline. When the engine turn 1700 rpm the fuelpressure is 59psi. When the engine is accelerating the pressure drop to 44psi. Is this normal ?

    Mike
    NO!! It should stay in the high 50s, fuel pump, regulator or maybe blocked filters.

    R88

  6. #6
    Mtuned's Avatar
    Join Date
    Aug 2010
    Location
    Orlando FL
    Posts
    724
    Those plugs are lean, for idle cruise or wot. I would pull pump and check pick up screen and then check lines..

    Dont keep running the ski like this.

  7. #7
    dnielsen's Avatar
    Join Date
    May 2008
    Location
    Shreveport, Louisiana
    Posts
    2,018
    +1
    94
    Quote Originally Posted by mmvane2 View Post
    I put a pressure gauge into the fueline. When the engine turn 1700 rpm the fuelpressure is 59psi. When the engine is accelerating the pressure drop to 44psi. Is this normal ?

    Mike
    Not normal!

  8. #8
    Thanks.
    mike

  9. #9
    MSRXP's Avatar
    Join Date
    Sep 2010
    Location
    Central MS
    Posts
    5,448
    +1
    7
    Quote Originally Posted by mmvane2 View Post
    Click image for larger version. 

Name:	IMG_0357.jpg 
Views:	773 
Size:	120.6 KB 
ID:	257098
    Is this to lean or rich. I think i hae a fuelproblem. My RXT-260 RS turn max 7500 rpm.

    Thanks
    Mike
    Not normal at all! Do you have an afr gauge?

  10. #10
    Moderator Snoman's Avatar
    Join Date
    Apr 2006
    Location
    South Chicagoland
    Posts
    14,688
    +1
    846
    Any mods to your ski? If so what??

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. help with spark plug colors on rxt 215
    By 4pinwink in forum 4-Tec Performance
    Replies: 21
    Last Post: 06-20-2012, 07:08 AM
  2. Virage i 800 Spark Plug Coloring
    By lilman573 in forum Polaris Open Discussion
    Replies: 1
    Last Post: 07-26-2010, 09:17 AM
  3. grey/greenish color on spark plugs??
    By RXPteamtimebomb in forum 4-Tec Performance
    Replies: 12
    Last Post: 05-07-2009, 08:41 PM
  4. stock spark plug color at idle
    By ou812 in forum 4-Tec Performance
    Replies: 3
    Last Post: 04-22-2007, 11:21 PM
  5. spark plug color/texture
    By MDGPR in forum Yamaha PWC Performance (2-stroke)
    Replies: 1
    Last Post: 04-12-2007, 10:14 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
  •