Piston C-Clip Concern
pxctoday

» Log in

User Name:

Password:

Not a member yet?
Register Now!

» Find OEM Parts

» Jobs

» wallpapers

Results 1 to 10 of 10
  1. #1
    Frequent Poster
    Join Date
    Feb 2014
    Location
    BC Canada
    Age
    47
    Posts
    203

    Piston C-Clip Concern

    I am putting together the top end in my 1999 Yamaha GP800. I ordered a top end kit from SBT, including cylinders. The piston pin c-clips are a concern.


    3 of them are in there tight and snug. 1 is a little looser and can be easily spun with my finger, while in its bore. The other 3 are tight and cannot spin in their bore.
    I am reluctant move along with the rebuild with this one loose c-clip. The most recent failure of this engine was due to a c-clip that came out of its bore while running. It was also an SBT c-clip
    that failed. I can't be sure if I did something wrong on the last top end rebuild. When I opened it up, 1 clip was missing and went through the engine. I can tell as there are
    gouges in the piston and cylinder, just about the size of c-clip pieces. I will re-do the engine again and see how things go.

    Should I be concerned about this one c-clip that does not seem as tight as the others? I sent SBT an email today to ask for another new set of c-clips. I think I'll try another new set, see if it is tighter.

    For your interest you can see the piston with the missing c-clip upon disassembly here. Thanks.


  2. #2
    Top Dog hooka-2's Avatar
    Join Date
    Nov 2005
    Location
    sebring florida
    Posts
    1,801

    Re: Piston C-Clip Concern

    I would not run it like that. I had a similar failure a long time ago. Motor ate the clip just like yours
    90 X2 (750), 92 X2 (750), 93 X2 (750),93 X2 (750), 99 Ultra 150(sold) 1995 Waveblaster 1

  3. #3
    PWCToday.com Is My Home Away From Home Myself's Avatar
    Join Date
    Jun 2006
    Location
    Arkansas
    Age
    41
    Posts
    5,134

    Re: Piston C-Clip Concern

    You are aware that those "C-clips" have athrust side right? The more squared edge faces out, rounded edge towards the pin.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  4. #4
    Frequent Poster
    Join Date
    Feb 2014
    Location
    BC Canada
    Age
    47
    Posts
    203

    Re: Piston C-Clip Concern

    Inspecting the clips with a magnifier, both sides appear identical. I don't see a more squared edge. Are you cure SBT clips have specific thrust sides? Thx for this tip.

  5. #5
    PWCToday.com Is My Home Away From Home Myself's Avatar
    Join Date
    Jun 2006
    Location
    Arkansas
    Age
    41
    Posts
    5,134

    Re: Piston C-Clip Concern

    I can feel the squared edge. Run a finger over it and it feels sharper.
    http://www.bing.com/images/search?vi...=28&ajaxhist=0
    http://www.bing.com/images/search?vi...x=7&ajaxhist=0

    Here is the rounded side that would go towards the pin
    http://www.bing.com/images/search?vi...125&ajaxhist=0

    And here is the squared off edge that would face out. You should see the difference.
    http://www.bing.com/images/search?vi...oAHaFj&iss=VSI

    Unless you have the more common CIRCLIP which is totally rounded but I've not known SBT to use those like everybody else.
    Last edited by Myself; 05-02-2018 at 05:51 PM.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  6. #6
    Frequent Poster
    Join Date
    Feb 2014
    Location
    BC Canada
    Age
    47
    Posts
    203

    Re: Piston C-Clip Concern

    By gum, I went back to look again. You are correct. That's a new one for me. Likely why the engine failed 36 hrs after the last overhaul. I had no clue about a thrust side of the c-clip. Thanks very much.

  7. #7
    PWCToday.com Is My Home Away From Home hyosung's Avatar
    Join Date
    Aug 2010
    Location
    Australia
    Posts
    8,456

    Re: Piston C-Clip Concern

    it is also important how you fit them. lay flat over the hole and push strait in with either a plastic tool or 2 fingers .
    i use a plastic tool which is basically a ground down screwdriver handle with a lip to catch the clip and push it in.
    dont stretch or squeeze them at all.
    http://www.pwctoday.com/showthread.php?t=425767

    modded X2 650

    900 powered custom 650 sx .

    Jerry Rigging is my specialty .....



    if i did like everyone else and copied everything i needed or wanted i would save lots of time and money.

  8. #8
    Resident Guru JC-SuperJet's Avatar
    Join Date
    Jul 2013
    Location
    Cypress, TX
    Posts
    1,024

    Re: Piston C-Clip Concern

    I use my thumbnail

  9. #9
    I dream skis GabeH's Avatar
    Join Date
    Nov 2012
    Location
    North Carolina
    Age
    45
    Posts
    585

    Re: Piston C-Clip Concern

    I’ve never heard this so I opened my clips that came with my new Wiseco pistons. They’re perfectly round in profile.


    Sent from my iPhone using Tapatalk

  10. #10
    PWCToday.com Is My Home Away From Home Myself's Avatar
    Join Date
    Jun 2006
    Location
    Arkansas
    Age
    41
    Posts
    5,134

    Re: Piston C-Clip Concern

    That is the style most everybody else uses referred to as a circlip. They go in either side.
    Last edited by Myself; 05-04-2018 at 05:52 PM.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

Thread Information

Users Browsing this Thread

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

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBadvanced CMPS v4.2.0