Wiseco Piston For Sale on ebay
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Thread: Wiseco Piston For Sale on ebay

  1. #1
    Senior Member elime's Avatar
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    Wiseco Piston For Sale on ebay

    I came across a new stock bore Wiseco piston at a decent price. It will work in a TW. Do an ebay search for "Wiseco 4292" and see what they are going for if you have any questions.

    Doing a base gasket ? Now is the time to upgrade. Wiseco Stardard Bore Piston Kit 84 88 YTM200 YFM200 Moto 4 Std 67 0mm YFM200DX | eBay
    littletommy likes this.
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  2. #2
    Member nordic1's Avatar
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    Little Tommy - I'm doing a base gasket on my '05 TW - slow leak.
    I've ordered the parts and will do over Christmas break.
    The bike runs fine with 7k miles, but maybe I should have it honed and place new cylinder and rings.
    Your stating this Wesco kit will be a direct fit?
    Thanks


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  3. #3
    Super Moderator littletommy's Avatar
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    Quote Originally Posted by nordic1 View Post
    Little Tommy - I'm doing a base gasket on my '05 TW - slow leak.
    I've ordered the parts and will do over Christmas break.
    The bike runs fine with 7k miles, but maybe I should have it honed and place new cylinder and rings.
    Your stating this Wesco kit will be a direct fit?
    Thanks


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    I think you meant to address Tony (elime) instead of me.
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  5. #4
    Senior Member joeband's Avatar
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    someone already bought it. - not me, though i'm in the market.
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  6. #5
    Senior Member elime's Avatar
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    Double post.
    Last edited by elime; 12-08-2015 at 10:45 AM.
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  7. #6
    Senior Member elime's Avatar
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    Quote Originally Posted by nordic1 View Post
    Your stating this Wesco kit will be a direct fit?
    You need a minimum of .002" clearance -- a little more is better. I think will be good but if a little more is needed then a little extra honing for new rings ought to be enough. The kit comes with a new wrist pin and new rings that have to be gaped.

    If you don't have micrometers you can measure piston to cylinder wall clearance using feeler gauges -- not the best way but it works.

    This is a 67.5mm piston going into an enlarged cylinder. Feeler gauge .002 was loose and .003 was so tight I couldn't push the piston in. Feeler gauge .0025 was snug. Measure clearance at the very bottom of the skirt -- the part that is barely showing. That is the widest part.

    P5310064 (2).JPG

    I took a cyllinder with 30K miles on it and a new stock sized 67.0mm Wiseco piston and put it in the cylinder and measured with the feeler gauge. Feeler gauge .003 was loose and .004 was very tight. Personally I would not hesitate to use this piston in this cylinder. Service limit for a stock Yamaha cast piston is .004. A forged piston will have greater limits because it expands more than the cast piston when it gets hot so I feel this piston should work out fine. I am sure others will disagree but we all have our own opinions.

    This is the 67.0mm piston being measured with a feeler gauge. I flipped the piston over for a different view. It doesn't matter -- all that is important is the diameter.

    The feeler gauge extends past the bottom of the piston.

    P5310066 (2).JPG

    I bet the piston will be a "drop in". The clearance should be checked if you want to...............
    Last edited by elime; 12-08-2015 at 10:52 AM.
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  8. #7
    Senior Member admiral's Avatar
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    Quote Originally Posted by elime View Post
    The kit comes with a new wrist pin and new rings that have to be gaped.
    How to do this? The ring gap.


  9. #8
    Senior Member elime's Avatar
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    Quote Originally Posted by admiral View Post
    How to do this? The ring gap.
    Do it once and it becomes simple.

    1) Put ring to be gaped into cylinder.

    P5310063 (3).JPG

    2) Square ring in cylinder by pushing down with piston

    P5310064 (3).JPG

    3)Measure gap with feeler gauge. If not enough then you need to file the ends a little teeny bit. If to large a gap -- oh well -- use them anyway.

    P5310065 (3).JPG

    There are instructions with the piston on how to determine the gap.
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  10. #9
    Senior Member admiral's Avatar
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    Easy Button Pushed!

    Thanks.


  11. #10
    Member nordic1's Avatar
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    Awesome - thanks for the detailed input.


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