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Thread: Question about TW piston

  1. #1
    Member rsamsel's Avatar
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    Question about TW piston

    So the video is clear on the question but....

    I have my wifes TW apart. The head and the cylinder are removed.

    This is the question:

    The piston slides back and forth on the piston side of the rod. Is that normal? All else seems perfectly tight but I don't know if I've seen a motor which allows the piston to slide back and forth. Obviously the cylinder would prevent that from happening but it is worth an ask.

    See video below.

    Thank you,
    Rob
    Kent, WA

    https://www.youtube.com/watch?v=LLMX...ature=youtu.be
    Last edited by rsamsel; 04-23-2019 at 07:52 PM.
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  2. #2
    Senior Member SHAG's Avatar
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    Like you said.. " With the cylinder on, It can't slide back and forth " !!

    You need a new piston and rings. Your cylinder will need honed and / or bored also.

    You will also need to find out what caused the damage.
    Peterb and jtomelliott49 like this.
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  3. #3
    Member rsamsel's Avatar
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    Whoa hey....you have me confused. Its normal so it's ok to slide back and forth.

    Buuuut whoa....what damage do you see in the vid that is damaged and needs all that replaced??
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  5. #4
    Senior Member Peterb's Avatar
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    Yes that side to side is normal but all that scoring on your piston is not. Looks like either overheating of the engine or poor lubrication. I imagine your cylinder looks similar?
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  6. #5
    Member rsamsel's Avatar
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    Yeah wow. I'm here to tell you I can tend to suck at this stuff! That's why I'm in the position I am in. I will save the long story.

    Short story is I tightened the chain adjuster way too much. Tore up the plastic.

    Wife riding...loses power....smoking and dead on the side of the road. Plastic from the cam slides everywhere. Put a cam in b/c it was smoked.

    Starts and runs but there was still a knock. Fair to say that knock was piston slap b/c of the damage to the skirt and the cylinder?

    Guys ...I am just good enough to screw things up so be nice to me :-)IMG_0339.jpg
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  7. #6
    Member rsamsel's Avatar
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    IMG_0337.JPG
    Attached Images Attached Images
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  8. #7
    Senior Member elime's Avatar
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    Normal side to side play of piston on the wrist pin/rod.

    As for the piston skirt, I agree either overheating (I think most likely), lack of oil, or piston was fit to tight when installed.

    As for the cylinder wall, I bet there is aluminum transferred from the piston to the wall making in look really ugly but I bet it cleans up with some acid, emery cloth and patience. Maybe even scrap it off with a single edged razor blade.

    As long as you need a new piston anyway maybe consider a high compression (10.25:1) Wiseco piston. The piston comes with rings, wrist pin, and clips to hold the pin in place. Simply gap the rings and install.

    Wiseco 4292M0670 for the stock size (67.0mm). Also made in 67.5mm and 68.0mm

    Let us know how it all turns out.
    Sthrnromr and jtomelliott49 like this.
    Long live the internal combustion engine!

  9. #8
    Member rsamsel's Avatar
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    Just fyi....that cylinder is absolutely baby butts smooth to the touch despite how the piston looks.
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  10. #9
    Senior Member elime's Avatar
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    Quote Originally Posted by rsamsel View Post
    Just fyi....that cylinder is absolutely baby butts smooth to the touch despite how the piston looks.
    Maybe it will clean up with just a hone.
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    Long live the internal combustion engine!

  11. #10
    Member rsamsel's Avatar
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    Quote Originally Posted by elime View Post
    Normal side to side play of piston on the wrist pin/rod.

    As for the piston skirt, I agree either overheating (I think most likely), lack of oil, or piston was fit to tight when installed.

    As for the cylinder wall, I bet there is aluminum transferred from the piston to the wall making in look really ugly but I bet it cleans up with some acid, emery cloth and patience. Maybe even scrap it off with a single edged razor blade.

    As long as you need a new piston anyway maybe consider a high compression (10.25:1) Wiseco piston. The piston comes with rings, wrist pin, and clips to hold the pin in place. Simply gap the rings and install.

    Wiseco 4292M0670 for the stock size (67.0mm). Also made in 67.5mm and 68.0mm

    Let us know how it all turns out.
    How did anyone work on anything before the internet? Raa

    Ok...I am ready to spend the $100 for the Wiseco set. I see them on ebay. Nothing else needs changed / modded for that swap?

    Also, after the cam chain catastrophe we cleaned everything as well as humanly possible without cracking the case. How can I rule out oiling being the problem once the new kit is installed? Can we say 100% for sure the old piston was a victim of the cam chain guide f up and now thats its cleaned up it will be ok?
    jtomelliott49 likes this.

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