AMF Roadmaster

Discussion in 'Motorized Bicycle General Discussion' started by dracothered, Jul 18, 2013.

  1. dracothered

    dracothered New Member

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    I found the engine I will put on this bike...

    50cc moped engine w/ Pedals

    [​IMG]

    Would you just get rid of the normal pedal side sprocket with one of these?

    This is what it has...

    Engine
    Displacement 49cc
    Engine Type Air Cooled, Single-Cylinder, 2-valve, 4-stroke
    Bore/Stroke 41mm x 47mm
    Final Drive Chain
    Fuel Delivery no
    Fuel Unleaded / 93 Octaine
    Reccomended Engine Oil 10W-40 Petroleum Based (Nonsynthetic)
    Ignition
    Kick Start Pedal
    Electric Start Yes
    CDI no
    Auxillary Output Yes
    Transmission
    Transmission 2-Speed auto w/ Hi & Low range selector
    Shift-Pattern no foot shifter
    Clutch
    Semin auto (no hand clutch)
     
  2. dracothered

    dracothered New Member

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    He's giving orders again, but no on listens to them...
    [​IMG]

    Got my gas tank and a few other needed parts.
    [​IMG]

    [​IMG]

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    [​IMG]
     
  3. KenX

    KenX New Member

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    I should learn just to shut my mouth earlier and keep my opinion to myself. I see what a cool looking little bike is now. It takes a little time for some of us. Thank, you!
     
  4. dracothered

    dracothered New Member

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    Some of what I show here is my thought process so I can chew over what I am building. As it moves forward it will change a little here and there, but the basic idea is set and flowing.
     
  5. silverbear

    silverbear The Boy Who Never Grew Up

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    That is a very cool engine... four stroke, 2 speed, both electric and kick start, built in pedals. It would even be legal in many states. Do you have a link for more about it... source, cost, etc. ? Not that I'm in the market for an engine, but it is all good to know. I'll be interested to see how you mount it and how you like it. Looks like a winner to me.
    SB
     
  6. silverbear

    silverbear The Boy Who Never Grew Up

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    Draco,
    You asked about removing the present pedal from the bike frame. My guess is that the pedal being built into the engine you are choosing is designed so that pedaling forward moves the bike forward, then freewheels while not pedaling and giving a smart kick backwards on the pedal is how you manually start it. Pretty slick! The Tomos A-35 is set up like that. So, you end up with just one sprocket at the rear wheel corresponding to the engine sprocket. Left hand side, in other words.

    If indeed this is how your intended engine is set up then your perfect solution is to remove the little bottom bracket extention from the bike frame and hang the engine under the frame. There should be plenty of room. But I wouldn't cut it off until I knew for sure how the engine was set up. This would give a low center of gravity and make the bike handle nicely all the while looking good. Cool motor!
    SB
     
  7. dracothered

    dracothered New Member

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    Here is where one could get it http://tboltusa.com/store/50cc-moped-engine-pedals-p-1301.html and it is $299 plus $30 shipping.

    Yes SB I'm leaving the BB there until I have the motor in hand and see where it will go. Thanks for your help so far.
     
  8. dracothered

    dracothered New Member

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    OK, so I took apart a gas tank from an old chain saw to make a battery box for my AMF. This tank had two sides to it, as one was for the bar oil I think and the other was for the gas. At first I was going to solder in a new center section but I was able to get a good bond so I just cut out the end in the original center section and will use it that way.

    [​IMG]

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    [​IMG]

    Now all I have to do is solder two of the section together and create a latch for the third section and mount it to the frame.
     
  9. mapbike

    mapbike Active Member

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    I like what you're doing on this thing, gonna be a nice ride when your done..... great idea on the battery box.

    Map
     
  10. curtisfox

    curtisfox Well-Known Member

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    This i have to watch closer. AWESOME the way its turning out. ............Curt
     
  11. dracothered

    dracothered New Member

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    Wait till you see the Worksman wheel I'm putting on the front of it. It's a 20" with a brake drum and will get a 20 x 2.3 tire.
     
  12. dodge dude94

    dodge dude94 New Member

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    You gonna put suspension forks on that bad boy?
     
  13. dracothered

    dracothered New Member

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    I was not planning on it but I may in the end. How hard would it be to convert the forks that is going on there now? They are from an OCC chopper. Could the tubes be replaced with suspension tubes?
     
  14. dodge dude94

    dodge dude94 New Member

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    Maybe Suzuki K10 forks?
     
  15. mapbike

    mapbike Active Member

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    You could build a springer fork set up out of them, the welding would ruin the chrome and would require that you paint them so they would look good but a springer fork could be fab'd up pretty easy actually.

    Here is something that is crude but I just marked up in word program.
    [​IMG]

    maybe this will give you some ideas and maybe it's nothing you haven't already thought of, but here it is just the same.

    Peace, Map
     
  16. silverbear

    silverbear The Boy Who Never Grew Up

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    Suzuki K-10 forks will fit and are awesome forks, but the legs are wide enough apart that you would need to come up with a longer axle for the Worksman wheel. A hassle for sure. Something from a moped will work nicely and your axle on the Worksman would be fine. Something like a Puch or Tomos would work. A nice thing about a triple tree fork is that it extends the front wheel several more inches, essentially stretching the frame some.
    SB
     
  17. dracothered

    dracothered New Member

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    Have any idea what the diameter is on the K10 forks are where they mount to the triple tree?
     
  18. mapbike

    mapbike Active Member

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    Hello, SB

    You mentioning the Puch or Tomos forks as working in a bike made me remember a question about that I have had.
    Will the bearings that are normally used on a 1" bike fork stem work on the moped fork stem, I have seen that many are 26mm on the mopeds but I have no experience with messing with the moped stuff, seen some cool looking forks that treatland.tv has and was wondering if I could use a set of them with standard bike head set hardware?

    Sorry dracothered dont mean to high jack here, just seen this as a good oportunity to ask this question and thought the answer could help others as well as my self know what can be done with the moped forks.

    Peace, Map
    reddd
     
  19. dracothered

    dracothered New Member

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    If the steer tubes on the moped forks are 1" then I would have to modify them because mine takes a 1 1/8 forks.
     
  20. mapbike

    mapbike Active Member

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    The forks I looked at on treatland had 26mm head/steer tube which is just a fraction over ( 1") 1.0235" to be exact according to my Mitutoyo Calipers, and you would need something around 28.5mm steer tube, just scrolled through everything they have on treatland.tv and all I see is 26mm and 25.5mm head/steer tubes and a couple that were like 25.2mm.
    some of them are dang nice looking forks for sure.

    https://www.treatland.tv/category-s/117.htm?searching=Y&sort=5&cat=117&show=50&page=1

    map
     

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