Whizzer Powered Sportsman Flyer

Discussion in 'GAS POWERED BIKES' started by sportscarpat, Dec 8, 2010.

  1. sportscarpat

    sportscarpat

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    Here is my latest project. A Whizzer powered board track racer. The frame started life as a Worksman INB, but little of that remains. I am currently building 12 of these bikes. The Whizzer powered models, called the "WZ", and the Racer model which is powered by the Morini S6S 9.4 hp two stroke. Should be mid 50 mph bikes.

    Specification:
    Sportsman Flyer "WZ" BTR frame Assembly Serial number: SFWZ001X
    Sportsman Flyer 4" stretch stainless steel gas tank
    Sportsman Flyer stainless oil tank/tool box (to hide electronics)
    Sportsman Flyer BTR style handlebars
    Sportsman Flyer BTR seat assembly that still needs to be leather covered
    Reinforced rewelded and machined Monark springer fork
    Whizzer NE5 engine by Quenton
    WZ headbadge by Terry
    Worksman aluminum rims with stainless spokes and front drum
    Graphics and website design by J Docherty

    [​IMG]
    Sportsman WZ Flyer by Sportsman Flyer, on Flickr

    [​IMG]
    Sportsman WZ Flyer by Sportsman Flyer, on Flickr

    [​IMG]
    Sportsman WZ Flyer by Sportsman Flyer, on Flickr
     
  2. iRide Custom Bicycles

    iRide Custom Bicycles

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    Well, that's awful purty!
     
  3. yeshoney

    yeshoney

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    I have a question for you which you may have already thought of. I have had a Monark springer in which i used a drum brake upfront and when i used it the tendency is the pull the spring apart which is quite awkward when you are braking on a downhill. If you are going 50 I am not sure you want the spring going in that direction under braking. Maybe you have some other fix up your sleeve that I can't see.

    Curious about what kind of prices you are asking.

    This is one the nicest iterations of the early 1900's reproduction motorcycles/boardtrack racers i have seen. The ergonomics look good from the pics. Are you gonna put crank/pedals in the BB?

    Joe
     
  4. Beau

    Beau

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    That's the reason I won't use a springer on mine.Plus there's no damping, and that is scary at high speed with unbalanced wheels/tires.

    If you mount the brake on the stationary legs of the fork, it should stop the fork from diving or extending when braking.

    I have seen your build somewhere else. Can't remember but I love it!
     
  5. sportscarpat

    sportscarpat

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    I have used these forks on so many motor bike builds now and have not experienced any of the issues your mentioning. I also go to great lengths to upgrade these forks for the application. Check this link about the Monark forks and see what I do to basically finish the manufacturing process on them. http://www.ratrodbikes.com/forum/viewto ... =1&t=26659 These forks work great. They also work better than the original Schwinn knee action springer which works in and out, changing the wheel base while riding. I know because I have both and ride them all the time. The Monark works in an up and down direction which maintains the same relative wheel base. Schwinn and Monark ran front brakes on these bikes all the time for decades. They knew what they were doing. Just do it like they did. This is old technology with no shock absorbers. It's a springer just like back in the good old days!
     
  6. sportscarpat

    sportscarpat

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    The bike will be finished out and will get a pedal crank. It still has all the final finish work needed and that will be done by it's new owner and not me, unfortunately. This is one build I hate to see leave my shop. No worries, though, as I will be building a few more. Not many, but a few and I will keep one for myself!
     
  7. Ace

    Ace

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    Awesome looking version, I like it. But I do have a question about your belt-tensioner:
    After having owned two Whizzers myself, I am surprised to see a tensioner on the backbelt instead of the frontbelt. As far as I remember the pully goes downwards when applying the clutch, but while looking at your bike it seems you put even more tension on the backbelt when you pull the clutch ? How does it slip or idle like this ? Or is it my memory that is slipping away ? :lol:
     
  8. sportscarpat

    sportscarpat

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    Ace,
    Good question. I have this entire bike drawn in CAD so it is easy to verify center distances through the various pulleys and the idler. Only one belt needs to slip, the front belt. The rear pulley to clutch distance never grows as the pulley travels through it arc of travel down. In fact it shrinks slightly from clutch to idler and from clutch to rear sheeve. I have also seen vintage Whizzers running idlers on the return side of the secondary belt so it should work fine. I will know soon enough. This bike is a manual clutch version. The next two are centrifugal clutch models with no pulley travel at all.
     
  9. cobrafreak

    cobrafreak

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    That is anti-dive you are speaking of. BMW made a mechanical anti-dive front fork for their motorcycle called an "Earls Fork". Normally when you brake the fork compresses and the front end dives changing the geometry of the bike and losing all your suspension travel. With the Earls Fork it was reversed so that the suspension climbed when braking. This is desirable to have and not a negative as you can maneuver properly when stopping to get around road hazards.
     
  10. sportscarpat

    sportscarpat

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  11. LarzBahrs

    LarzBahrs

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    Do you have any pictures if the bike with the morini 9.4?
     
  12. sportscarpat

    sportscarpat

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  13. dash

    dash

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    what material did you use for the seat ? the rear hub on the morini build is sweet did you tap into the hub and directly mount the sprocket ? your bikes are top notch!!!!!
     
  14. sportscarpat

    sportscarpat

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    Seat is steel and seat brackets are laser cut stainless. Actually all the little brackets and even the gas and oil tank are stainless. Kind of becoming my signature on my builds. Hubs come all set up for both sprockets and even had the correct offset so I could run the Morini engine on the bicycle frame centerline. This was a key component in getting this application to work correctly without having to offset the engine.
     
  15. LarzBahrs

    LarzBahrs

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    How much are you asking for these bikes?
     
  16. chainmaker

    chainmaker

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    Man Pat Cant stop going back to look at these.. I really like how the chamber fills the drop loop on the morini version.
    Hmmmmm.... Maybe after the Panther

    Cheers
     
  17. c.p.odom

    c.p.odom

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    Is anybody mounting the engines as a stressed member?
     
  18. LarzBahrs

    LarzBahrs

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    I dont think it would look right with these engines because they are just to small
     
  19. c.p.odom

    c.p.odom

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    Depends on how you do it. If you are building or seriously modifying a frame you can chose where the engine is placed, get a better look and better chain alignment.
     
  20. dhaxlesi

    dhaxlesi

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    How do people afford to go travelling for months, a year or more soon after finishing uni? How much money do you need to go travelling / backpacking round Asia / South America / the rest of the world for a few months? And how the heck do so may poor, newly qualified 21yr olds with massive student debts afford to do it??
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