Are there any benefits from gearing a motor bike kit?

shinjinian

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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.
 
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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?
 
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?
 
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):


20131014.jpg
 
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).
 
but if you need more cartage capacity, the SickBikeParts (deluxe) shift kit has enough reserve strength to increase the payload some more:


multi_11.jpg


multi_15.jpg


multi_14.jpg
 
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?
 
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:

http://motorizedbikeforum.the-talk.net/t353-additional-stability-for-the-sick-bike-parts-shift-kit


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.
 
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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.
 
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