Are there any benefits from gearing a motor bike kit?

Discussion in 'General Questions' started by shinjinian, Jul 21, 2014.

  1. shinjinian

    shinjinian Member

    I have a 66cc skyhawk engine and was considering trying to gear it. Is there any added benefit from it? Also if anyone else has done it can they post some pictures to help give me some ideas.
    Last edited: Jul 21, 2014

  2. HeadSmess

    HeadSmess Well-Known Member

    well, im surprised....not one recommendation to get a shift kit...

    now you know what to put into the "search" bar ;)

    if you mean a two or three speed affair... nope. havent seen on on here but i sort of started having a go at an auto one using the gears from a 1:5 RC car....

    i have a mill, a lathe, and even i put it on the shelf for a while to stew...

    theres a really nice thread on a "dog clutch" 2 speed using an electric motor(with plans) somewhere on here. quite simple, really. used chains and fairly common sprockets.

    do you want a simple kit or to make something yourself?
  3. shinjinian

    shinjinian Member

    Thanks for the reply. I actually found out about the shift kit last night while digging around the forums, to my surprise I even found a fuel injection kit. I'm not opposed to making one myself but I'll probably end up getting the shift kit so I can put the extra effort into other parts of the bike. Having a mill and a lathe must be great for projects, I had a small x2 mill but I got rid of it because it was too small for a lot of my projects and I never got the money for a larger one so I'm regretting selling it lol. Could I get away with using the standard shift kit with a 66cc or do I need the HD kit?
  4. Fabian

    Fabian Well-Known Member

    If you install a shift kit (with right hand side and left hand side chain tensioners) you'll be able to do this (with ease):

  5. shinjinian

    shinjinian Member

    Seriously? If it could pull that off I'm sold, although I'm pretty sure hauling a trailer around when these bikes aren't street legal will definitely get me pulled over (I live in NYC).
  6. Fabian

    Fabian Well-Known Member

    but if you need more cartage capacity, the SickBikeParts (deluxe) shift kit has enough reserve strength to increase the payload some more:



  7. LR Jerry

    LR Jerry Well-Known Member

  8. shinjinian

    shinjinian Member

    Do I need the HD shift kit or can I get away with using the standard one? The standard shift kit says people with 66cc motors should get the HD kit but what's the difference between them?
  9. Fabian

    Fabian Well-Known Member

    If you take one piece of advise, get the "Deluxe" shift kit, because it has all of the components of the HD shift kit but comes with a lot of useful bicycle tools, that if purchased individually they would be more expensive.

    I would also purchase the optional left hand side chain tensioner and the right hand side chain tensioner, because these two items (although not required) make the shift kit bullet proof in practice; giving total reliability as well as increasing it's service life.

    You will need to make these two small modifications to the shift kit for reasons that are explained:

    and this simple modification to the right hand side chain tensioner is beneficial:

    Spare parts that i would order from the word go are 1 x replacement snap ring + replacement locking ring + replacement bearing for the heavy duty freewheel.
    In my application i have found that the HD freewheel bearing fails after 6,000 kilometers (3,700 miles) but if you replace the replaceable inner bearing race after 2,500 miles you will have total reliability of this component.

    The heavy duty White Industries freewheel bearing is the secret to the long term reliability of the shift kit - don't leave home without it.

    A non essential optional improvement to the right hand side chain tensioner is the use of Terracycle ball bearing flanged idler wheels, and they are sexy looking items.
    Last edited by a moderator: Dec 15, 2015
  10. shinjinian

    shinjinian Member

    Interesting, I figured the shift kit would've included something to keep it from torquing out of alignment, thanks for making me aware of that. I don't need the deluxe kit because I already have a nice heavy duty chainbreaker and a crank removal tool.
  11. Mariaspurr

    Mariaspurr New Member

    I would also purchase the optional left hand side chain tensioner and the right hand side chain tensioner, because these two items (although not required) make the shift kit bullet proof in practice; giving total reliability as well as increasing it's service life.

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  12. Fabian

    Fabian Well-Known Member

    This is the simple (cost free) fix with better aesthetics than the powder coated discs that you see in the video, in that they've been drilled with 6mm holes and linished back to a brushed aluminium finish.


    but a much better option is the installation of Terracycle ball bearing, flanged sprocket idler wheels, and they look far more professional than the standard idler wheels supplied with the right hand side chain tensioner:



  13. Fabian

    Fabian Well-Known Member

    I have copied this post from another thread, describing what can happen to the White Industries Freewheel if you run the 67082RS bearing to failure:

    You will find that pawls have not failed (they are bullet proof), but it's the 67082RS bearing that will have failed:


    and when the bearing completely fails, the inner and outer shells separate from each other, which in turn chews out the blue locking ring; allowing the jackshaft sprockets attached to the outer section of the Heavy Duty freewheel bearing to move outwards, thereby detaching itself from the pawl mechanism.

    Although the White Industries Heavy Duty Freewheel bearing is a far superior design in material construction and durability than the basic freewheel bearings on the market, the weak link in the system is the 67082RS bearing.
    From my experience, and as part of regular maintenance, you "MUST" be vigilant in inspecting the bearing slop, by grabbing the 44 tooth sprocket and giving it a wiggle. The bearing should be changed when slop gets to about 1/8 of an inch.

    So long as you replace the bearing when it starts to give out, you won't have any problems with it failing on a ride.
    If the bearing does suffer a complete failure, you "MUST" replace not only the bearing but also the blue locking ring and the snap ring and dust seal, regardless if they look ok.

    SickBikeParts sells these components individually (including the 67082RS bearing), but you have to ask for them by name.
  14. Ghost0

    Ghost0 New Member

    Just felt like I needed to clear some stuff up. While we love Fabian to death because he has pushed our products past their design intent and provided very useful feedback he has done just that, gone past their design intent. So while Fabian has lots of neat ideas and good feedback, MOST of the things he recommends are not REQUIRED. As you can clearly see from his photos he does things far beyond what most of us would do. I guess my point is that if you are just going to ride your bike then you don't need to do anything but bolt it on and go but if you are going to haul an extra 500 pounds around then you might want to invest in a truck.
  15. shinjinian

    shinjinian Member

    Like I said my bike is going to be strictly a street commuter bike. I won't be driving aggressively up and down offroad slopes and I sure as hell won't be pulling a trailer since motor bikers are completely illegal in NY and having a trailer would just be asking to get pulled over and get my bike impounded or worse. Do I need the HD shift kit or can I get away with using the standard shift kit or the shift kit from
  16. Ghost0

    Ghost0 New Member

    Well it depends on your engine. We only recommend using the standard shift kit on 49 cc engines. If your engine is the larger 67 cc engines then you should use the HD kit. Don't know why you would want to buy a cheap Chinese copy of our kit instead of buying the real one.
  17. shinjinian

    shinjinian Member

    Honestly I didn't know if your kit was the original or not, all these motorized bike parts are cloned and sold by a hundred companies so it's hard to tell and keep track. I guess I'll go with the HD kit if I decide to keep the bike. I might end up selling it as is for $300-400 and getting a higher quality engine to put on one of my other frames.
  18. Fabian

    Fabian Well-Known Member

    That's a very smart and sensible idea.
    It's only when you get to hold the White Industries Heavy Duty Freewheel bearing, that you'll instantly see the quality built into the product.
    The White Industries HD freewheel bearing holds a much tighter mechanical tolerance than the standard duty freewheel bearing and if you ever get to see one next to the other it will become immediately apparent that the standard duty freewheel bearing is less than a second rate option.
  19. Pablo

    Pablo Motored Bikes Sponsor

    It's interesting when people come to us AFTER they buy the cheap copy kit. Pretty much never get them going and then need to start replacing parts. We try to tell people ours is the original, and here and the other forum folks know, but these forums are not the entire MB world.
  20. Fabian

    Fabian Well-Known Member

    Would it not be prudent to have reserve pulling power when socially lubricating your options :banana:
    This image is a fine example of the SickBikeParts shift kit in action, allowing double towing and even triple towing if required.