i took the piston out of the barrel i cant get it in HELP

Discussion in 'Motorized Bicycle General Discussion' started by 4wdingman, Sep 20, 2008.

  1. 4wdingman

    4wdingman New Member

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    i took the piston out of the barrel to clean it now it wont go back in. The rings seem to have come loose to. Can anyone tell me what to do??
     
  2. Caus-I-Can

    Caus-I-Can New Member

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    The rings are designed to be bigger then the cylinder. you have to sqeeze them in as you insert them into the bore. (there should be a little guide pin in the ring channel where the the two ends of each ring should meet}

    P.s. ideally should only take out cylinder when installing new rings.
     
    #2 Caus-I-Can, Sep 20, 2008
    Last edited by a moderator: Sep 20, 2008
  3. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Take your time, use some oil, it's not too hard.
    Let us know how you do.
     
  4. Dave31

    Dave31 Moderator
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    They do make a tool called a ring compressor....but I have never needed to use one on small applications, I just use my fingers
     

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  5. Saddletramp1200

    Saddletramp1200 Custom MB Buiilder

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    Be careful you CAN cut your fingers if your not careful!
     
  6. Egor

    Egor New Member

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    Caus-I-Can - said it all ( the pins in the piston ring slot ) if the ring ends are not at the pins you can not get the piston on. Have fun Dave
     
  7. 4wdingman

    4wdingman New Member

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    thanks for all the info I got both of them in but one ring broke:( but i have ordered a new pair in.
    Just wondering can you ride with just one??


    Thanks
     
  8. misteright1_99

    misteright1_99 New Member

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    I wouldnt, the rings hold the piston away from the wall of the cylinder as well as provide a seal for compression. With only one ring the piston is going to "slap" against the cylinder wall, possibly scratching it, then scratched even with both rings installed your compression will be low because it is escaping by the rings thru the scratches.....
     
  9. Caus-I-Can

    Caus-I-Can New Member

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    I wood tend to agree with Misteright1 99, although fun story - when i was just a wee lad of bout 11 my old peice of crap motorbike that my folks got me the prevous Xmas ( it must have had at least 10 owners before me and predated the vietnam war), seized. Dad was busy so i went at it - took off the head and looked in side and saw this metal thing stuck between cyclinder and chamber so got out the pliers gave it a big tug, put the head back on and off i went for about another year nd half.... ha ha....wont say it had much power thou .. although at the time iwas told it was the carbs
     
  10. Saddletramp1200

    Saddletramp1200 Custom MB Buiilder

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    Don't do it unless you want to buy A new liner & head.
     
  11. Egor

    Egor New Member

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    The rings have nothing to do with holding the piston away from the cylinder. The rings hold compression from getting into the crankcase. The oil keeps parts from touching. There are a lot of two strokes that only have one ring, I have one of the happy time engines that I have with only one ring on the piston, it is more for racing but it is OK for these. The wide double rings on these engines indicates a simple durable engine. You can install the piston in the barrel first leaving just enough out the bottom to slip the pin in, make sure the clip is in the slot to hold the pin in. Have fun, Dave
     

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