Newbe 70cc build... FAST

Discussion in 'Introduce Yourself' started by Cube26, Apr 11, 2013.

  1. Cube26

    Cube26 New Member

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    G’day all this is my 1st time on the forms and also my 1st time to build one of these bicycles.
    Bit of background info, I’m 20 years old, live in the south eastern suburbs of Melbourne near Pakenham. Love cycling and have a good collection of bicycles including Mtb’s, a recumbent and some road bikes. I sold my tandem as I had no room for it. Then decided to build a motorized bike, partly due to the fact of writing off my car . I was strapped for cash so I purchased a new $100 70cc engine kit of eBay, but after a few rides wanted more speed so got this shift kit http://www.ebay.com.au/itm/JACKSHAF...ies&hash=item2c6aef5c7a&_uhb=1#ht_4978wt_1271
    It was cheap but after a little bit of cutting and grinding it works.
    This kit is stock except for some extra mods that I made:
    -Installed a 4.5l quad bike tank as the metal ones rust
    -New fuel line with 2 taps and 2 filters
    -cut a piece of metal and put a rod through it so I can run 2 brake cables off the one lever
    -Front shifting as well as rear which allows speeds of 70kmh on flat but also the ability to climb hills around 40o without the need to pedal
    -And to sort out the stretching of the chain over time I install a tensioner that keeps the chain tight and also stops the engine moving and reduces the strain of the engine on the frame.

    The hardest part with the front shifting due to the lack of space to install a derailleur, so I cut and welded the old one and made it half the width. I also cut up the old front cranks and used it for the sprockets.

    Here is the gears im running:
    -engine 10T, runs to left side of shift kit 17T
    -right side of shift kit 10T, runs to crank freewheel 36T
    The gears:
    Front-
    1st- 28T
    2nd-38T

    Rear-
    1st-28T
    2nd-24T
    3rd-21T
    4th-18T
    5th-16T
    6th-14T

    All in all if you oil the bearings each trip with quality oil and keep a good 2 stroke mix I use between 18:1 and 20:1 this cheap kit is awesome.
    .xx. xct2
     

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  2. Cube26

    Cube26 New Member

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    I thought I might also ask, Ive done about 400kms so far and I lube all parts and also the 2 gears in the crank case but how often do I need to remove the head to clean the piston and more to my point is there a way to remove the head without wrecking the gasket as I don't have any gasket glue
     
  3. Cube26

    Cube26 New Member

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    Also for those who want the mock sticker to help make your 70cc look a 48cc under 200w I have made a copy of the sky hawk one
    print to actual size as a photo sheet size 4x6"
    and the sticker will be right size
     

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  4. Dave31

    Dave31 Moderator
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    Welcome to motorbicycling.com Cube glad you joined us. Very nice motorized bicycle (^)
     

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