Page 1 of 2 1 2 LastLast
Results 1 to 10 of 12
  1. #1
    roundtopjeff's Avatar
    Join Date
    Aug 2011
    Location
    Clarkston Michigan
    Posts
    64
    +1
    1

    03 RXDi with low compression in pto cylinder

    My daughter was driving my RXDI when it quit and needed a tow. I took the plugs out to check for fouling. Plugs looked fine but theres no compression in pto cylinder. My question is: Is there anything I should check before I tear the head apart to check for bad rings or hole in piston? example: fuel injector, reed valves etc.


  2. #2
    This is how I run a jetski shop in the desert nmpeter's Avatar
    Join Date
    May 2008
    Location
    Elephant Butte New Mexico
    Posts
    6,529
    +1
    1,279
    uhh..check your wallet...it's about to get a bit lighter

    I'll wager a holed piston..check the plugs with a magnify glass if you see little speckles of metal..the piston will have a hole it it.

    just for stats sake..how many hours on it and did it ever ingest water...?

  3. #3
    roundtopjeff's Avatar
    Join Date
    Aug 2011
    Location
    Clarkston Michigan
    Posts
    64
    +1
    1
    It has 175 hours on it but the head has been off before. I just bought it this year. I suspect its a hole and just wanted conformation before tearing into the head.

  4. #4
    This is how I run a jetski shop in the desert nmpeter's Avatar
    Join Date
    May 2008
    Location
    Elephant Butte New Mexico
    Posts
    6,529
    +1
    1,279
    Quote Originally Posted by roundtopjeff View Post
    It has 175 hours on it but the head has been off before. I just bought it this year. I suspect its a hole and just wanted conformation before tearing into the head.
    If you are really not keen on pulling the head and don't have access to a peeper camera you can always poke around with a real long ziptie to probe to see if you find the hole...this depends on some luck and also being able to get the suspected piston at TDC.

    It's going to come off at some point anywayy, so why shouldn't you be first to know?

    pull the cylinder head...you know you want to..we want pictures of course.

  5. #5
    roundtopjeff's Avatar
    Join Date
    Aug 2011
    Location
    Clarkston Michigan
    Posts
    64
    +1
    1
    Theres no need to poke or prod anymore Pete. Very funny though and your right about wanting to tear it apart...I did want to. I pulled the Rave valve and found a big half moon shaped hole just below the valve. There goes my Mid Aug. vacation again (Check out my sad sack post on the Polaris forum from last year ).

  6. #6
    This is how I run a jetski shop in the desert nmpeter's Avatar
    Join Date
    May 2008
    Location
    Elephant Butte New Mexico
    Posts
    6,529
    +1
    1,279
    ahhh the window to the soul of the engine..forgot about that avenue of inspection.

    was there ever water ingestion?

    I'm lettin my di bleach in the sun..I can't justify the rebuilding costs for a two seater (not real popular around here)

    the motor had ten hours on when it ingested and was never started after that ( duh..we forgot to tell you when you lent it to us last year we flipped it and jimbo and goober couldn't get it started again..so we just put it back in the garage before you got out of county)

    I know the electrics and the head are worth some bucks..and an unbroken set of di cases will fetch a good dollar too..once i get around to stripping it down

    I know if I was doing a DI motor I'd pull an sbt and lower the compression just a touch.

  7. #7
    roundtopjeff's Avatar
    Join Date
    Aug 2011
    Location
    Clarkston Michigan
    Posts
    64
    +1
    1
    I bought the RXDI because its light, quick and very stable (compared to the XP). I think my Daughter was drag racing her uncle on a long calm channel, WOT for miles (it could have been as much as 4) can kill any engine, never mind one with 175 hours.

    Never ingested water as far as I know.

    BTW: any possibility of a top end rebuild with the engine in?

  8. #8
    If i knew,...I wouldn't ask sea-one's Avatar
    Join Date
    Aug 2009
    Location
    Dallas/Waxahachie
    Posts
    2,340
    +1
    109
    WOT shouldn't be an issue at any distance on a stock ski, imo its either a clogged or weak injector or an oil line break.

  9. #9
    roundtopjeff's Avatar
    Join Date
    Aug 2011
    Location
    Clarkston Michigan
    Posts
    64
    +1
    1
    I did not see any oil spilled in the hull and the everything inside the cyl looks lubed up. Fuel starvation on the other hand is what killed (bad fuel regulator) my old DI Polaris and the hole in the piston looked similar to this one.
    BTW: Who makes the best top end kit for Seadoo 2 strokes?

    P.S. I will post pics soon as possible.

  10. #10
    Lake Lion
    Join Date
    Jul 2007
    Location
    Dirty Jerzey
    Posts
    773
    +1
    118
    OK, so whats the prognosis? And the pics.

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. Replies: 54
    Last Post: 09-29-2014, 09:32 PM
  2. Replies: 6
    Last Post: 07-05-2012, 10:40 AM
  3. GP1200r Low Compression In Middle Cylinder...FML
    By GPR305 in forum Yamaha PWC Performance (2-stroke)
    Replies: 5
    Last Post: 04-21-2011, 11:10 PM
  4. 94 GTX with No compression in Rear Cylinder. How can it run 40 MPH?
    By JohnCiccarelli in forum 2-Stroke Performance
    Replies: 12
    Last Post: 10-14-2009, 05:43 PM
  5. 0 Compression in PTO Cylinder
    By Hockey369 in forum Yamaha Old School Skis
    Replies: 15
    Last Post: 08-15-2008, 09:19 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
  •