Will an 80cc motor handle my weight?

Discussion in 'Introduce Yourself' started by travisatwork01, Jun 16, 2009.

  1. travisatwork01

    travisatwork01 New Member

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    Hi everyone, I just signed up today but over the last few weeks, I have been trying to gather all the information I can about building one of these cool bikes.

    Being the neurotic I am, I decided to go to the Louisiana State Police HQ with a photo of what I want to build because I could not get a straight answer about what is legal. It seems that in Louisiana, anything that rides on the street has to be street legal, be registered at the DMV, have a VIN number, and insurance. It was funny that the photo I displayed to the state troopers showed two bikes parted in front of the state capital building and they were not street legal. lol

    With all the behind me, the thought of my heavy body riding a 50cc motor did not sound to appealing, so if I’m going to have to make it street legal, I would like to have a 80cc motor. I weigh about 240, so I do not want to go thru all the red tape and find out that I get about 15 miles per hour.

    Will an 80cc motor handle my weight?

    Also, I want to buy an American motor. Do you know of any vendors that provide a good motor selection?

    Thanks,
    Travis.
     
    #1 travisatwork01, Jun 16, 2009
    Last edited: Jun 16, 2009
  2. Retmachinist

    Retmachinist New Member

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    You are not going to find an American made motor if you are planning on using one of the 50 or 66 cc 2 stroke motors. At your weight I would get the 66 cc motor, there isn't such a thing as an 80 cc, they just refer to them as 80.
    I wouldn't be as concerned with the motor as I would getting a good strong bike frame, with some good wheels and tires.

    John
     
  3. NEAT TIMES

    NEAT TIMES New Member

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    Travis, Welcome, I Go Close To 300, You Just Get The Rear Sprocket To Compensate. It Will Not Be A Problem. Some La. Members May Advise You About The Legal Necessities , Good Luck, Enjoy. Ron . . .cvlt1
     
  4. toytime

    toytime New Member

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    You will have no issues with the wieght but a good rear rim and tire is a must. The rear sprocket, along with the high speeds are hard on those rims.
     
  5. travisatwork01

    travisatwork01 New Member

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    Thanks for the help everyone.
     
  6. lowrider

    lowrider New Member

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    Or is it an 80 cc motor that we are forced to call 66 here in America due to our forms of measurement ??
     
  7. Forbisher

    Forbisher New Member

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    Huh??? who are you kidding? :D Is that the new math they are teaching in schools these days?
    Where there are no wrong answers?
    It is very simple math......

     
    #7 Forbisher, Jun 17, 2009
    Last edited: Jun 17, 2009
  8. lowrider

    lowrider New Member

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    What about the space in the head? I really dont know anything about it but its my understanding that there is space there not taken into account in the equation.
     
  9. wheelbender6

    wheelbender6 Active Member

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    I weigh 200 and a 50cc china motor pulls me fine.
    I agree that you should invest in a strong back wheel (from a tandem bike or industrial bike, or have a shop build one for you). It will help your tires and brakes last longer and save a lot of hassle down the road.
     
  10. Forbisher

    Forbisher New Member

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    You said it and you are right :D

    You have space in your head?

    Engine displacement - Wikipedia, the free encyclopedia
     
    #10 Forbisher, Jun 17, 2009
    Last edited: Jun 17, 2009
  11. misteright1_99

    misteright1_99 New Member

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    I weigh 190 and the 48cc pulls me along fine. At first I tried the 50 tooth sprocket but could only go about 20 ( and the motor was screamin). I run a 44 tooth now and cruise at 25mph.
     
  12. matt167

    matt167 New Member

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    yes, but adding those numbers into the engine size figure is incorrect... the formula is BORE X BORE X STROKE X .7853982 .. adding the extra cc from the cylinder head is incorrect as the head space in the engine is the combustion chamber and has nothing to do with the engine size.. they do that on the china engines specifically to make them sound bigger than they are...
    could even take it a little farther.... if you had an engine that the pistions were in the hole say .025 instead of being at 0 deck, that would equate to about 3cc ( bore size effects this ) that would also become part of the combustion chamber, and then if you were to add a .045 compressed head gasket, that would add another 7cc to the combustion chamber.. so if it was say a 100cc engine, by figuring it the way the china's are advertised figured, it would be 110cc, because of a thick head gasket and a pistion that doesn't come to 0 deck.... but it doesn't work that way
     
  13. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    To get back on topic, yes the "80"cc engine will pull your weight, with a 44T and using a little leg power for hills.

    There are no current 2 stroke in frame made in America engines as of this date.
     
  14. mekano

    mekano New Member

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    I weigh 250 and the tuned 62 cc (the not so common engine between the 48 and 66) I have works fine for me.
     
  15. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    I have a 47cc that pulls me, and I weigh 200.
    I just had a well used 80 out for a spin and it pulled the hills here with half throttle.
    44T Stock "80"cc
     

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