Top speed?

Discussion in 'Motorized Bicycle General Discussion' started by TheNecromancer13, May 7, 2015.

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  1. TheNecromancer13

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    I was just wondering, what's the average top speed of the 66cc engines without mods? I can just barely get to 40mph with mine if I pedal to help it accelerate, once it gets there, the motor will keep it at 40, I have a 36t rear sprocket. Is it normal to be getting 40 without any mods or did I just get really lucky and get a good engine?
     
  2. YesImLDS

    YesImLDS Member

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    Sounds about right for a 36T. My modded China doll with a 36T does about 46-47 on flat. Not heavily modded by any means. And my buddy who has a 36T and some port work hits about 42-43.
     
  3. Trey

    Trey $50 Cruiser

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  4. rustycase

    rustycase Gutter Rider

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    Seems to me you are getting a very respectable speed.
    rc
     
  5. mapbike

    mapbike Active Member

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    40mph with a bone stock engine and 36T is a very good top speed, Ive seen engines that struggle to hit 40mph even with several mods.
     
  6. Davezilla

    Davezilla New Member

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    I agree... Very respectable for a bone stock engine...
     
  7. donb4103

    donb4103 Member

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    I have built about 180 bone stock bikes to sell to the public. The average speed of these bikes out of the box is about 32-35 mph. Wheel size and rider weight and sprocket size will determine what the bike can do without any mods.
     
  8. Nashville Kat

    Nashville Kat Active Member

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    I'm having a bit of trouble bedlieving these claims- granted my 66 is nearing 8 years now and still has a 6mm stud bottom end- but with an aluminum billet and updated stock NT Speed carb, NARROW tires 27 x 1 1/4 on aluminum wheels-

    I can't get much over 35 on the analogue speedo

    with a 34 alloy sprock directly bolted to a wide flanged fixie hub

    She cruises pretty well at 30, though the vibrations could be better, and I'm thinking about a newer mount-

    but once you get to 35 it doesn't feel there's much left, and I;m not worried about trying either.
     
  9. donb4103

    donb4103 Member

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    I think your bike is about the average nashville kat. You probably did not match up or port your intake to match the carb.There are ways to grab a few miles per hour but with a smaller sprocket you should have gained a little top end speed.
     

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