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  1. #1
    www.2-Stroke-Porting.com
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    Look at this $.10 Failure

    Here are some pics of a circlip breaking. No sign of circlip turning. Apparently broke with 60% remaining in place to hold wrist pin. I believe it broke into two pieces coming out of the transfer port. A very small piece, and the longer piece stuck in the cylinder wall. Engine is a Yamaha 700 Mtn Max.

    Pic #1 Circlip Stuck in plating.

    Pic #2 Circlip piece(s) escape thru Transfer port.

    Pic #3 Piston Damage

    Pic #4 M T weld & repair - now ready for plating.

    I really don't know if this was a re-used circlip? But this will make you want to use a new one!

    Just a reminder that there are NO parts, or clearances, that can be taken for granted. Please check Everything!


    Lowell


    www.2-Stroke-Porting.com
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  2. #2
    Moderator OsideBill's Avatar
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    I have re-used one or two in the past, you can be sure I won't again


    off topic: What is the function of the extra exhaust port?

  3. #3
    www.2-Stroke-Porting.com
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    [QUOTE=OsideBill; What is the function of the extra exhaust port?[/QUOTE]

    Most of the Sleds and MC's have a "triple" exh. port. Main exh. and two sub exh. This Greatly helps BlowDown and is why with a tuned pipe they make so much more HP per CC than a ski. This gives larger total area, and less ring problems.

    I have to admit I have re-used circlips. I suspect the excessive piston to cylinder clearance may have contributed. Just don't quite know how???

  4. #4
    WATER WOODY's Avatar
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    Man,that clip really dug in.A very nice repair. Ive always been against putting used parts in a new motor and never have,but a circlip,i would have never thought they would break like that,and if i needed to put a used one in,i wouldnt think twice about it until now.Thanks for sharing Lowell.

  5. #5
    james k's Avatar
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    I always use new especially at $.11 a piece but that is just nasty Lowell...

  6. #6
    That failure kinda falls into (ya just never know) category... Granted we all have re-used circlips and spiralox, they still shouldnt break like that..

    Hi rpms have a tendency to make a circlip close and fall out if not installed at the correct angle, and thats usually what happens on a circlip failure. It shouldnt just snap and break, but thats racin!

    I wonder why all these 2 stroke pistons are not machined for spiralox clips instead of circlips.
    Ive never seen a spiralox come loose, or break...

  7. #7
    Duke's Avatar
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    I'm very quilty of reusing c-clips from time to time. Never again.

    What kinda RPMs does that tripple port sled turn Lowell??

  8. #8
    Fat Man, Little Boat Region8Ultra250X's Avatar
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    along the same lines...... of re-using parts..... i always like the guys that attempt to reuse the GM LS series head bolts and manifold bolts that are torque to yield...... i point and laugh when the blow a head gasket and burn up valves over 50 bucks worth of bolts

  9. #9
    This is going to hurt!! DANGER1049's Avatar
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    Don't new circlips come with new pistons? I know they do from wiseco,wsm etc..

  10. #10
    Duke's Avatar
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    Quote Originally Posted by DANGER1049 View Post
    Don't new circlips come with new pistons? I know they do from wiseco,wsm etc..
    Not with the OEM Yamaha. I was missing 2 in my order on the last rebuild and used old ones. Not many hours on them tho.

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