Results 1 to 4 of 4
  1. #1
    Rendog's Avatar
    Join Date
    May 2005
    jacksonville fl.

    2001 RXDI air pump!

    Does anyone understand how the airpump works on this ski? Can you explain the purpose of it, obviously it works with the Direct Injection! Friend of mine has one and we were told it is the problem leading to the engine not running at idle

  2. #2
    I had one here that failed completely but it still idled and reved up but not very well.
    It's a compressor that pumps high pressure air into the fuel rail so that it helps inject the air/fuel directly into the combustion chamber. now i'm not sure on the timing of it but it needs the extra pressure to overcome the building cylinder pressure after the exhaust port is shut with the piston comming up therefore no fuel goes out the exhaust.
    it works off the balance shaft, so check the air comming out of the hose going into the fuel/air rail, if there is none then remove the top off the airpump and see if the little, piston is moving up and down while turning the engine by hand.
    Also don't be fooled by the actuation of the rave valves after shut down as a verifation of the air pump working, i just did one where the piston was not going but they still worked, and the only reason i could think of is that the air was getting pushed back through the opening air injectors pressurising the system

  3. #3
    Rendog's Avatar
    Join Date
    May 2005
    jacksonville fl.
    Thanks man, that was very informative! The piston is moving up in its cylinder but the guy that owns the ski says when he removed the hose that runs from the piston to the fuel rail there was no pressure? We are curious if the discs that seem to act as reeds in the top assembly aren't closing?

  4. #4
    could be, they have been known to fail, also check the condition of the bore

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 2001 RXDI CB resevoir question
    By RumRunnerRon in forum 2-Stroke Performance
    Replies: 5
    Last Post: 03-27-2010, 06:00 PM
  2. FS 2001 rxdi mpem
    By Wetracer in forum Sea Doo Classifieds
    Replies: 0
    Last Post: 12-16-2009, 04:19 PM
  3. 2001 gpr 1200 pump
    By daddyville in forum Yamaha Classifieds
    Replies: 3
    Last Post: 06-24-2008, 08:42 PM
  4. 2001 RXDI peaks at 51mph and 6100rpm
    By RX-Chris in forum 2-Stroke Performance
    Replies: 20
    Last Post: 06-08-2008, 10:03 PM
  5. 2001 RXDI Woes
    By Ajax in forum 2-Stroke Performance
    Replies: 8
    Last Post: 04-28-2008, 10:39 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