top speed for slightly mod 66cc?

Discussion in 'Motorized Bicycle General Discussion' started by Legwon, Mar 15, 2013.

  1. Legwon

    Legwon New Member

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    ok so i hit up 50km on flat terrain today on my 66cc monster

    ported, 41 chain, speed carb, and 50tooth spocket

    does that sound right??


    its a 2stroke China engine
     
    #1 Legwon, Mar 15, 2013
    Last edited: Mar 15, 2013
  2. biknut

    biknut Active Member

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    That's good, but anyone should be able to do that with a bone stock motor. BTW you're over reving your motor. That would be high rpm with a 44T unless you have a 29er.
     
  3. Legwon

    Legwon New Member

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    doesn't sound like over-revving. i have over-revved it in the past, so i know what that whine sounds like.
    its a steady throttle, sitting about 90% ,,, not WOT

    also, the bike itself weighs about 50-60lbs
    heavy little beast!!
     
    #3 Legwon, Mar 15, 2013
    Last edited: Mar 15, 2013
  4. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    A ported HT with a large expansion pipe & jetted carb with a 40T rear sprocket should be able to hit 40 MPH. (give or take a few MPH). ;)
     
  5. CTripps

    CTripps Active Member

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    Sounds like you're in the right zone to me. On my beast I run a 66cc (the ports have been cleaned up and I lapped the head) with NT speed carb, stock exhaust and a 36T sprocket. I can get close to 60 kph on flat ground. If I stripped the carriers etc to reduce weight and drag I'd probably get a bit over 60 at the top end.
     
  6. Maxvision

    Maxvision New Member

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    Over reving? GAWD, I LOVE the sound of the 2 strokes when they SCREAM. I'd scream my stretch cruiser with shift kit every chance I could. Went through a few cylinders from heat build up but at $20 a pop for cylinders...I LOVE the sound of a 2 stroke when it SCREAMS

    [​IMG]
     
  7. biknut

    biknut Active Member

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    That's about 31 mph? That sounds about right for a 41T.
     

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