Running full blast

Discussion in 'Motorized Bicycle General Discussion' started by sisdavid, May 3, 2008.

  1. invader-zim

    invader-zim New Member

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    top speed i usually find people think is lower than it is on ANY vehicle.
    my ke100 forums say 45mph top speed ive had it up to 65
    hyosung gv650 say 130 ive had it up to 140 (track)
    honda CB400 says 85 ive had it to 91
    honda civic (not mine i drive a jag) says 118 ive had one to 125.
    i
    want to top out my jag but its too fast lol they say it tops out at like 155 but ive never had it up above 120.(1994 xj6)
     
  2. HOOKWORMRIDER1

    HOOKWORMRIDER1 New Member

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    I run the crap out my motor for over two years now and put just over 6000 miles
    and it starts for every morning.
     
  3. sisdavid

    sisdavid New Member

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  4. Prasinos

    Prasinos New Member

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    Speaking of redlines. Does anyone know the gear ratio between the crank shaft and the output gear? No offense but please dont reply with speculation.
     
  5. jasonh

    jasonh New Member

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    If your eyes are good you can try counting....

    [​IMG]

    Otherwise...dunno.
     
  6. Prasinos

    Prasinos New Member

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    Hey thanks alot,
    The quality isint good enough to count the teeth but I enlarged the image and used a program to find the radii of both gears. The ratio comes out to be 5 to one. If you want to know that means at your engines 7000 RPM Redline the drive sprocket should be rotating at 1400 RPM you can use this to calculate your top speed according to the engine so you dont burn it out going down hills. If anyone can check that for me thatd be great.
     
  7. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    5 to 1 and 7000 sound correct.

    I wouldn't run wide open going downhill anyhow, that would be asking for it.
     
  8. CalgarysFool

    CalgarysFool New Member

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    No, no. By that logic, an engine that is not run at all should last forever!

    And surely this is axiomatic!
    (^)

    Brenton
     
  9. Dan

    Dan Staff
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    I don't know if it is right, but always worked for me. An old "wrench" told me the rule of thumb was to keep any engine at 3/4s and it would live it's life out as planed. With 44T rear sprocket on a Chinagirl, I find that 19 to 22 MPH seems and feels perfect on flat road. After that, it starts to feel and sound like it is time to change gears. (I have to try a SBP shift kit!)

    I have yet to try a 40T as Dax suggested but am absolutely going to soon.

    As has been said, it is how it feels to each and some plane old good luck with longevity.

    Any one have any high mileage 4 strokers?
     
  10. jasonh

    jasonh New Member

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    I think LargeFilipino has over 3 or 4 thousand miles on his Titan....
     
  11. Dan

    Dan Staff
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    Awesome Jason, TY. I rode a bunch of 4 strokes at last yr's East Coast rally. Man, it is a different world. I went WOT here and there, but 30 MPH was just joy.

    I love my China girls, just saying
     
    #31 Dan, Dec 2, 2008
    Last edited: Dec 2, 2008
  12. old motorbike

    old motorbike New Member

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    Mine just vibrates too much at full revs.
    I feel that about 4 to 5000 is about all that mine will full power out at stock. I just gear it so it will go 30mph at 4000rpm. Much smoother.

    It seems the police won't like you faster than that anyhow!?
     

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