Results 1 to 6 of 6
  1. #1
    bex's Avatar
    Join Date
    Sep 2009
    Location
    Nassau Bahamas
    Posts
    178
    +1
    1

    Worn coupling (rubber biscuit)

    Trying to narrow down the source of an engine rattle, I had the opportunity to look at the flange coupling today while blocking off the oil pump and it looks like the rubber biscuit is worn.

    I am wondering what the penalties are for running the ski with a slightly worn coupling? Can the biscuit fail catastrophically? The bottom line is I am wondering if I need to get the biscuit changed out before I go back in the water.


  2. #2
    All hail the Chief! fullboogie's Avatar
    Join Date
    Nov 2005
    Location
    Texas
    Posts
    3,155
    +1
    44
    They're cheap - get a new one.

  3. #3
    305coco's Avatar
    Join Date
    May 2007
    Location
    cape coral, florida USA
    Posts
    2,362
    +1
    55
    make sure your motor mounts are good, if they are not the rubber bicuit will wear out faster, happened to me...

  4. #4
    Moderator DrewNJ's Avatar
    Join Date
    Dec 2005
    Location
    Marlton, NJ
    Posts
    3,716
    +1
    1
    also make sure the motor is aligned. This will eat up the couplers too.

    Whether or not you can run on the one you have until you pick up a replacement would be a judgement call on your part....

  5. #5

    Join Date
    Apr 2006
    Location
    panama city beach 'fl
    Posts
    1,846
    +1
    9

    Cool

    Quote Originally Posted by bex View Post
    Trying to narrow down the source of an engine rattle, I had the opportunity to look at the flange coupling today while blocking off the oil pump and it looks like the rubber biscuit is worn.

    I am wondering what the penalties are for running the ski with a slightly worn coupling? Can the biscuit fail catastrophically? The bottom line is I am wondering if I need to get the biscuit changed out before I go back in the water.
    ya need to check wear ring on pump will make a bunch of noise out of water,also if your hearing noise at idle out of water(or not)when gpr motors get some time on them they do rattle bad ,

    later bone fish charlie

  6. #6
    bex's Avatar
    Join Date
    Sep 2009
    Location
    Nassau Bahamas
    Posts
    178
    +1
    1
    I have 160 hours on the motor, 9 hours since a top end rebuild. The biscuit has some signs of wear right on the edges of it. Looks shiny about 2mm from the edge of it.

    The housing was worn, and the original impeller was badly worn as well, leading edges were eaten up. I put a 12/18 68N00 prop on for the last 9 hours since rebuild and the wear ring has no visible signs of wear, and the prop was untouched. Have since swapped out the old 12/18 for a Solas 13/19 Concord and have not ran the boat since, also did the R&D plate and PPK. I ran it after the jet pump was put together and the noise was gone. Will have to see what happens after a ride perhaps tomorrow, or weekend. I had suspected the pump bearings but I woulda seen signs of rubbing on the wear ring.

    Its just strange I guess. But it always sounds after I come out of the water and start up on the trailer to blow any water out of the box before heading home. Then again on the trailer flushing out to put the ski up for the day.

    Just weird I guess.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. RXP-X 255 Drive shaft rubber housing/ boot worn off
    By Rampey1984 in forum 4-Tec Performance
    Replies: 7
    Last Post: 06-14-2015, 08:23 PM
  2. RUBBER SHAFT COUPLING needs replaced?
    By FullThrottleDave in forum Yamaha Old School Skis
    Replies: 3
    Last Post: 06-11-2008, 12:45 PM
  3. Running solas pitched impellor with stock rubber cone
    By bling bling in forum 4-Tec Performance
    Replies: 24
    Last Post: 06-29-2005, 03:54 PM
  4. Advise for a couple of new skis
    By jack in forum Sea Doo Open Discussion
    Replies: 4
    Last Post: 06-10-2005, 02:10 PM
  5. Hey guys a couple of small tips about our boats...good info
    By two2curupt in forum 4-Tec Performance
    Replies: 4
    Last Post: 05-21-2005, 04:01 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
  •