Results 1 to 3 of 3
  1. #1
    Sly Fox DKFox's Avatar
    Join Date
    Feb 2009
    Location
    Huntsville, Alabama
    Posts
    103

    What is this part's function?

    See attached diagram. Bottom end of a 720 Engine. It goes under the brass rotary gear. Is is just to keep spacing between the two bearings on either side of the rotary gear? Just wondering why its even there. Its not used in the 787 engine.

    I just put a 720 engine back together and I think its rubbing slightly on the rotary shaft causing it not to turn freely. (At least when turning by hand.) Engine is still out on my work bench. Guess I'll be splitting the case again to make certain it is seated correctly.
    Click image for larger version. 

Name:	720 Crank.jpg 
Views:	75 
Size:	58.2 KB 
ID:	211772


  2. #2
    badjoka's Avatar
    Join Date
    Jun 2009
    Location
    Fairfield, CT
    Posts
    1,387
    +1
    122
    thats the Retaining Ring part # 290926070 from onine parts microfiche and
    take a look here, may be of some help:

    http://www.seadooforum.com/showthread.php?p=138366

    http://partsfinder.onlinemicrofiche....ype=13&A=6&B=4

  3. #3
    Tool Bag water worx's Avatar
    Join Date
    Aug 2006
    Location
    Sunny Fla
    Posts
    1,925
    +1
    66
    It is there to keep the inner seals from blowing out in case of a backfire.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Help! What is this part ?
    By Dragdaddy71 in forum Yamaha PWC Performance (4-stroke)
    Replies: 3
    Last Post: 04-22-2013, 08:23 AM
  2. What is this part called? And does it need to be replaced?
    By tempest.runner in forum 4-Tec Performance
    Replies: 7
    Last Post: 02-10-2012, 12:35 PM
  3. What is this part???????????? (96 wave venture 1100)
    By rpt50 in forum Yamaha Old School Skis
    Replies: 10
    Last Post: 08-09-2010, 02:55 PM
  4. What is this part, and why do I need it??
    By boostaholic in forum Yamaha PWC Performance (2-stroke)
    Replies: 7
    Last Post: 04-30-2008, 12:21 PM
  5. What is this part?
    By J-ME in forum Honda Open Discussion
    Replies: 4
    Last Post: 04-28-2007, 10:51 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
  •