49cc High compression head

Discussion in 'Heads and Cylinders' started by shiveralex, Apr 16, 2017.

  1. shiveralex

    shiveralex New Member

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    I cant find anywhere (except gasbike for like 90 dollars) a good 49cc head. anyone got links?
     
  2. Cylon

    Cylon Member

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    I don't know of any, if you remove the head and sand it down a bit it will increase compression for free. I'm sure there's tons info in the forum about it somewhere.
     
  3. MotorBicycleRacing

    MotorBicycleRacing Active Member

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    There is a good and inexpensive moped head that fits your 48 cc.

    Sold by treatland.tv
     
  4. KCvale

    KCvale Active Member

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    Just put in a $9 NGK 5944 (BPR7HIX) Iridium spark plug.
    It's longer and better than stock and will give you about the same performance increase as a new head for that little 48cc 2-stroke, an expansion chamber exhaust will help the most though.
     
  5. Tyler6357

    Tyler6357 Member

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    Well, usually you sand the cylinder down to decrease the squish gap and increase compression, this is known as "decking" the cylinder. You don't usually sand down the head.
     

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