Discussion in 'General Questions' started by cspaur13, May 29, 2009.

  1. cspaur13

    cspaur13 Member

    can people post some pictures of there bikes with a jackshaft.

  2. Ghost0

    Ghost0 Guest

  3. cspaur13

    cspaur13 Member

    im not interested in the sick bike parts jackshaft. that seems to be all thats on that thread
  4. AussieJester

    AussieJester Member

    Not surprised they are outrageously overpriced IMHO..They cost more than you can buy a complete 49cc kit for :-S

    Here's one i knocked up for my brother on a Saturday morning for next to nothing-->



    Sorry i havent got any pics of the jackshaft on its own, suffice to say jackshafts are dead simple to put together, the bearing holders can be purchased from any good bearings supplier hit a scrap metal merchant up for the stell you'll get the whole job done for under 100 bucks EASILY.

    Best of luck...

    Last edited: May 30, 2009
  5. cspaur13

    cspaur13 Member

    wow u made that. looks professional. i almost thought it was the sick bike parts jackshaft. but im just using one to get the correct gearing since im using a harbor frieght 79cc 4 stroke.
    dose any1 have a pic of the jackshaft kit on your bike. the ones for go karts that are like 30 bucks
  6. graucho

    graucho Active Member

    Nice post/reply Jester.

    cspaur. i'm not sure of your exact plan, here's another source and a few photos. graucho



    7 down.... http://www.bmikarts.com/shop/?keywords=jackshaft&match_criteria=all&search=Search&cart=1778261

    Attached Files:

    Last edited: May 30, 2009
  7. cspaur13

    cspaur13 Member

    wow thats a nice jackshaft. its way more durable and better than the cheap 30 buck jackshafts. i woulnt have to have a freewheel if i lost the pedals right. thanks graucho
  8. macarollo

    macarollo Guest

    Aussie... do you have a front freewheel or do your pedals just spin violently when you gas the engine?
  9. AussieJester

    AussieJester Member

    It has a freewheel crank i made using an old freewheel and and crank set sourced from kerbside, the whole bike (minus the motor obviously) was made from parts sourced from the side of the road during council collection :) You can purchase either cheap or expensive freewheel setups if you don't have the tools to make your own, Cyclone sell them as do any high end bike store, freewheel cranks are standard on HIGH end trials bicycles :)

    cspaur13 : no you wouldnt, but then your bicycle would effectively become a motorcycle and thus be illegasl to ride on the street without registration and a license, aaaand unless i am mistaken even in USA you can't get a license at 14...gaaawd i hope not anyway LoL

  10. jlebh1

    jlebh1 Member

    would like more info too thanks
  11. cspaur13

    cspaur13 Member

    the cops will never bother me. there never are any in my neighborhood. people always ride there dirtbikes, atvs and go karts down the road. and horses are alooud as well. i might keep the pedals if they will fit with that big motor in the frame.
  12. cspaur13

    cspaur13 Member

    i went with grauchos style jacshaft. purchases everything last night. it will be in by friday.
  13. ZnsaneRyder

    ZnsaneRyder Member

    SWEET! So you are going to gear your HF 4-stroke engine to the 6 or 7 rear gears! I can't wait to see this.

    If you can get over 35mph on one of those engines with only one gear, imagine several!
  14. machiasmort

    machiasmort Active Member


    Just stop it!

    You guy's are giving me ideas and keeping me up all night reading!
  15. cspaur13

    cspaur13 Member

    will a gear reduction of 8.80:1 be good. and will i be able to take off from a dead stop
  16. ZnsaneRyder

    ZnsaneRyder Member

    8.8 sounds good. The small engine can take off from a stop, but I always recommend pedaling with the engine on a start to make it last longer, and have less wear.
  17. ZnsaneRyder

    ZnsaneRyder Member

    LOL. I can relate. I was reading so much stuff and stayed up until 7AM this morning, before going to bed.
  18. buzbikebklyn1

    buzbikebklyn1 New Member

  19. She's a Beauty

    Nice job on the rear suspension Kim. Once again you've outdone most of us with kerbside parts. Here's my similar version / pillow bearing supported shaft /bought from go cart supply for less than 100 bucks total.

    pillow drive 1.jpg

    pillow drive 2.jpg

    pillow drive 3.jpg
  20. Another version

    If you are eliminating the pedals you can use the existing bottom bracket to house the jackshaft, like this. Still cost about 100 bucks.


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