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  1. #1
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    Piston orientation

    First of all like usual I'm really sorry for my poor English skills.

    Mi piston broke, so I bought a new one. I mount it, but my cars doesn't start. In fact when I see closer the fuel doesn't flow inside the carb, even when i blow up the line. So I have huge doubt that I mount the piston in the right way. I read and watched several videos and the most clear was this: http://www.youtube.com/watch?v=Gk7vvPoXCTk (minute 8:32). He said The oil hole and the cut off of the piston goes to the front of the car or in direction of the carb.
    I unmount the starter and the back plate so i can check if the piston is in that position. Here a pictures:

    https://dl.dropboxusercontent.com/u/.../photo%201.JPG
    https://dl.dropboxusercontent.com/u/.../photo%202.JPG

    If I understand correctly the instructions my piston is in the correct way. But why the engine doesn't start?

    I found another instruction on the web: (removed) the picture post it in there show the piston in the other direction and supossed the oil hole is looking backwards too.

    I'm so confused , thank you guys in advance.
    Last edited by Double G; 05-10-2013 at 05:22 PM. Reason: content

  2. #2
    Marshal Double G's Avatar
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    That is the correct way.
    The Super Derecho

  3. #3
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    "In fact when I see closer the fuel doesn't flow inside the carb, even when i blow up the line." Sounds to me like there's a blockage at the carb. Cleaning it may help
    http://youtube.com/adolfss0n

  4. #4
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    I'm sorry I just notice that the link to other forum was with ***.


    To be cristal clear: This is the correct position?





    Not this one:




    I remove the High speed needle blow into the line fuel and the fuel flows. If the fuel pass this needle in what part could be blocked? the carb it self?

    Thank you again guys.

  5. #5
    RC Turnbuckle Jr. Nitronaught's Avatar
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    The piston cutout faces the carb/flywheel, there is also an oil hole in the conrod, it also faces the same direction as the cutout on the piston.
    Robin Williams
    He will be greatly missed...

  6. #6
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    Yes, as I recall you've mounted the correct way.

    I would set needles to factory settings and remove the airfilter, look into the carb, blow the fuel line and you should see the fuel coming. If see the fuel then it's okay.
    http://youtube.com/adolfss0n

  7. #7
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    Thank you guys.

    Step 1: check the engine mount is ok. Completed
    Step 2 make the car start, incomplete.

    I did what adolfss0n tell me and it doesn't flow, so, my carb is blocked (why is blocked if a never even touch it is the question) I'll take off and see what is blocking the fuel. I'll let you know what happen

    Thanks a lot guys.

  8. #8
    RC Turnbuckle Jr. fallonguy's Avatar
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    I would suggest you take the engine completely apart and clean everything. Reset the carb to factory setting because you put a new piston and sleeve in you have to go through the break in all over again.
    Last edited by fallonguy; 05-10-2013 at 08:32 PM.
    I wanted to put a really cool signature but I ran

  9. #9
    RC Turnbuckle Jr. Nitronaught's Avatar
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    Quote Originally Posted by Frixhias View Post
    Thank you guys.

    Step 1: check the engine mount is ok. Completed
    Step 2 make the car start, incomplete.

    I did what adolfss0n tell me and it doesn't flow, so, my carb is blocked (why is blocked if a never even touch it is the question) I'll take off and see what is blocking the fuel. I'll let you know what happen

    Thanks a lot guys.
    Ber VERY careful messing with the HSN housing, it is easily cross threaded, when that happens it strips....

    Sometimes the o-ring is not saeting properly in the HSN housing, it grabs a hold of the HSN needle cause it to block... Dip the HSN needle and the o-ring in some fuel then assemble... The fuel has enough lube to help with this issue when assembling and it won't hurt the o-rings
    Robin Williams
    He will be greatly missed...

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