SBT Jetski Engines, Parts & Accessories

Results 1 to 2 of 2
  1. #1
    Nov 2008
    Chicago Illinois

    Default (2004) 4-stroke engine question:

    I think one of the lifters is losing it's prime. Happens in mid range speeds 15-25 mph. Starts with a deep growling noise that sounds like it's coming from the breather box, then gradually lose power as noise gets louder, when idling there's a knocking noise coming from where the lifters are located and it seems to be running on 1 cylinder. Turn engine off for 10 seconds, restarts right up, idles great, take's off like nothing happened, I mean I've jumped on it from a dead stop and it stands up and goes, I've also started slow from a dead stop and it works fine till the next time, sometimes it acts up just down the trail then other times not for miles. I have an idea and just want to kick it around before breaking the engine down. My thinking is a lifter is losing it's prime and not working (knocking noise), I think it's an exhaust valve, the noise I'm hearing is coming from the pressure that's built up in the cylinder from the power stroke that's exhausting through the intake valve when it opens (growling noise). I've changed plugs, the old ones look great, checked oil level and oil light never goes on. I figured when I check the codes from the computer I should have multiple faults in the ECU but when checked MIL had none, thought there would be multiple fault codes as I feel it would screw with the EFI system.

  2. #2
    Aug 2001
    Las Vegas, Nevada

    Default Re: (2004) 4-stroke engine question:

    The forum you have posted on is watercraft only; Search for info on the ATV forums such as
    John Kubiak
    Powersports Technical Training Professional
    Las Vegas, Nevada
    Sea-Doo Tech 13736
    PWC Tech since 1988 (22 years)
    PowerSports since 1976 (34 years)
    Please do not use Private Messaging, use the forums.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 2004 XLT Engine Replacement or other options
    By CPTMcGhee in forum Yamaha
    Replies: 0
    Last Post: 07-03-2008, 12:50 PM
  2. Question about an engine.
    By Firebird! in forum Yamaha
    Replies: 11
    Last Post: 02-28-2008, 09:35 AM
  3. SBT 951 Engine issues / question
    By superd66 in forum Sea-Doo
    Replies: 3
    Last Post: 07-16-2006, 02:41 AM
  4. Carborator Question with new sbt engine
    By brad2510 in forum Kawasaki
    Replies: 2
    Last Post: 08-22-2005, 09:12 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