How fast can your 80cc really go?

Discussion in 'High Performance Bicycle Engine Tips and Motorized' started by freshwater, Aug 15, 2008.

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  1. freshwater

    freshwater New Member

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    The makers of the engine claim that the motor can do 35 mph, but can it really go that fast or even faster? How fast have you gotten your bike to and what did you do to make it go that fast?
     
  2. Scotty

    Scotty New Member

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    Ive done 60mph on a bike without a motor, just find a big hill.:D
     
  3. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    I can make my bikes go over 40 MPH with a sprocket, match porting, exaust mod & jetting.
     
    #3 Venice Motor Bikes, Aug 15, 2008
    Last edited: Apr 10, 2009
  4. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    I have gone over 40 mph, but not checking with a GPS, only a cars speedometer.

    Depending on the engine, and other factors, plus figuring it's up around "self destruct" on the rpm range, I would not suggest long high rpm runs.
     
  5. tylerlough

    tylerlough New Member

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    I've done 28 with a 50 tooth sprocket, that means my engine was spinning over 7000 rpms. When I get my 33 tooth that would be 42 mph. I don't advise spinning the engine that fast for more than a few seconds.
     
  6. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    I run them at full speed for miles at a time!! So far all the engines are fine.
    I mix my fuel at 25/1 after break-in, just to be safe!
     
  7. tylerlough

    tylerlough New Member

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    More oil the better in my view, just switched over to 22:1 from 16:1
     
  8. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    40 mph seems to be the practical limit. Mild tuning will get you there quite easily with a 67cc. Always pushing the engine limit, not gear ratio (with the kit)
     
  9. jasonh

    jasonh New Member

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    Well with my stock setup I've only gotten up to around 28 or so on the flat. I'm a bit heavier than the average Joe though, so that might have something to do with it.
     
  10. Easy Rider

    Easy Rider Santa Cruz Scooter Works

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    The highest I got on my stock HT was 34mph with a 44 tooth sprocket.
     
  11. freshwater

    freshwater New Member

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    I just got my Tachometer installed on my bike so when I get my bike up and running smoothly I will find out how fast I can get it. I have to break it in first.
     
  12. datz510

    datz510 New Member

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    This is about the fastest that I've gone with the same setup as well. Engine was turning 7400rpm! I feel bad now that I did it. Probably took some life out of the thing.
     
  13. Easy Rider

    Easy Rider Santa Cruz Scooter Works

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    That's what happened to me and I did take the life out of that motor! haha! Lucky for me, Dean helped me replace and fit some quality japanese and italian bearing. After that my HT motor ran like a champ and I could go WOT without the motor sounding like it was struggling.
     
  14. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Too much oil causes rapid build up of carbon, sticking rings and plugged baffles.
     
  15. Ghost0

    Ghost0 New Member

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    39.1, flat road, no wind, 6th gear. Probably could hit 40 if I got in a tuck position.
     
  16. ebmvegan

    ebmvegan New Member

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    Last week got clocked at 41 mph by sheriff on 39 tooth sprocket, dellorto carb with modified jet, modified Tomos A3 bullet exhaust, a helmet and goggles. Was then issued a speeding ticket on a 35 MPH zone. Engine said no more riding yesterday. It felt great.......but now I am MBless.
     
  17. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    How close is that compared to a stock CIF (chinese in-frame) final drive ratio?
     
  18. shiloh0

    shiloh0 New Member

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    my bike went tops of 41 on flat with a 27t sprocket. the revs were not up tho and i would say that the 27 tooth is too small. with a 32T it would prob be a better overall
    high speed setup. maybe for a burst the 27T with a nitrous charge would get it to 45 or higher. the mph seems way harder to get increased when you start hitting 35+
     
  19. tylerlough

    tylerlough New Member

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    With enough power that 27t is good to about 50.
     
  20. freshwater

    freshwater New Member

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    Wow fifty mph seems pretty fast for a beach cruiser. So if the less teeth on the sprocket the faster it goes. Which sprocket teeth count do you guys think is the best option in speed and torque?
     
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