Finished Hawthorne Boardtrack

Discussion in 'General Questions' started by hybrid, Apr 30, 2011.

  1. hybrid

    hybrid Member

    DONE! Just got done with my first couple trips around the hood. Did not intend for this bike to be this fast....it does 50 with me on it and I weigh 140lbs. 32 tooth sprocket vs. 80cc vs. a chopped and drilled exhaust. I built this bike to sell it but I am going to save that post for another thread. Told you guys I would give you first crack at it so I will list it next weekend and it will be listed for a week.
     

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  2. motorpsycho

    motorpsycho Active Member

    are you saying 50 mph? or 50 km/h?
    all you have is a 32 tooth sprocket and a chopped exhaust?
    how did you calculate the speed?
    I have a hard time beleiving 50 mph out of a stock 80 c.c. 2 stroke.
    that gas tank is HUGE!!!
     
  3. bigkahuna

    bigkahuna Member

    I was wondering if a mountain bike could be modified to look more retro, and after looking at your build it appears it can be. Personally, I would go with a smaller gas tank, but on the up side you could probably motor to Florida on a single tank of gas. ;)
     
  4. hybrid

    hybrid Member

    it got up to 49 mph on my little Bell wireless speedometer...and then I backed
    off. got a little scared! So yeah, I havent yet fully opened this thing up. A fresh build means a potential nut or bolt somewhere that still needs tightened and I HATE the taste of pavement! lol
    Be taking the next week to give this setup a little more break in and then I will post some video with the speedometer reading to youtube.
    It has Michelin all terrain tires that have been kevlared and a 26 inch BMX front end. This bike is not a mountain bike. I also installed a BMX layback seat post.
    The tank tapers and with the layback post your legs get a full extension for pedaling. Again this bike is not a mountain bike. Its an old Hawthorne cruiser.
    Steele but light as a feather. About 65 to 70 lbs as pictured.
     
  5. hybrid

    hybrid Member

    It has a wireless turn signal that is activated by the lean of the bike.
    Lean right and the turn signal blinks on the right side. lean left...You
    get it....Man, I am going to miss this bike!
     
  6. motorpsycho

    motorpsycho Active Member

    are you sure that your speedometer is calculated and set correctly?
    my bike does a true 32 mph, but i can recalculate the wheel size on the speedo to make it read 50 mph if i want.
    30 mph on a bike feels like 50 mph, and 50 mph on a bike probably feels like 100 mph.
     
  7. hybrid

    hybrid Member

    I understand your skepticism and I understand why you have it. This is not my first build either. Going to put some thought into a response while I am at work today. Frankly I an a little perplexed as to why it cooks like it does to. Its overshooting my math by about 15 mph.
     
  8. motorpsycho

    motorpsycho Active Member

    well, you do have a tiny 32 tooth rear sprocket and 26" wheels.
    the more i think about it, the more it seems possible to get that kind of top speed.
     
  9. hybrid

    hybrid Member

    Its really an accumulation of different factors...Yeah - the main being the sprocket to wheel ratio. The muffler was snubbed way short and rewelded with a drilled end piece. My friend came up with the most improvised and innovative
    motor mount that is made of a thick rubber core. It allows for a unique and very subtle...shimmy? Anyway, it seems to diperse the tension out through the chain and drive very even and controlled. I guess you would kind of have to
    see it idle to know what I was talking about. Lastly, believe it or not, the high seat and low bars. You sit on this thing almost in a jockey position, but your weight bares down on the front end instead of simply holding on. Weight vs. Force generating additional torque?
     
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