Bicycle Motor Refuses to start

your key way looks worn/ not right too wide. what does the other part look like and what does the key its self look like?
See the shoulder at the back of the slot that looks like what it used to be in width now it looks like its way to wide this will allow the timing to go to ****.
Did you heat up the shaft it looks like its been hot and the seal looks a little cooked if it is you will need to replace the seal or it won't run right if at all.

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norms-iron-works.tripod.com

Wow! It looks like you need a new engine.....no just kidding. I'm so happy for you, you have now figured out why it would not start. Your spark plug may have been sparking when your piston was on it's way down.
I think they may sell what I will call "offset keys" for the tuners that want to play around with timing. A little bit of filing on your part to make it fit would work.
I remember my father used to make his own keys with little 4 inch long bars that were made for making keys...(bar stock?)
I won't get into it now but I'm thinking that you now know enough to figure it out by yourself now. You want to make a key that will fill the slot totally, while at the same time, making sure that the parts line up the way they were supposed to. There are other solutions but all of them would involve too much money and time. Seems to me that now that we can get the whole kit for $200 Canadian from Zoom, it is not worth the time and effort.
This shows how hard we can be on our engines when we pop our clutch and stuff. That is why I always treat my baby as if she were my China girl!
Here is a pic of an offset key to give you an idea of what you want to make'

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I'm not buying from Zoom. There the same pos that I have. I'm getting one from a guy in thunder bay that sells them.

For the record the pic above isn't a pic I took..This is what is a pic I took with my cell phone to show you what I see now.

I'm STILL not seeing this key you guys keeping talking about. All I see is a shaft with a slot or whatever in it..Nothing even close to looking like a key of any sort.

Did the factory leave your key out? Is that what you are saying?

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visit my blog for Riding in the hood,... The home brew bike journal....http://frictiondrivebicycles.blogspot.com/ The deacon's fiction

Beats me. Could explain why it was so buggy all the time. What u see with the pic I took is what I see.

Who is Zoom ?? Do they have a webpage ?

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You can try this.

Bicycle Engine Kits

and here is Zoom

Bicycle Engine Kits, Kit Parts, Forums, Help, Support, 80cc 70cc 69cc 60cc 50cc 49cc 48cc - Zoombicycles.com

The reason your bike won't run is because you have no key!

Find a key at the local hardware store (take the piece you took off with you) and when you put it back together with the key in place, it will run.

Do this now.

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If it ain't broke, and you mess with it long enough, it will be.

But it ran before is the thing..They key just doesn't come on it's own. I've never see anything like this key at the hardware store anyway. I wouldn't know what to look for and beside i think the "thing" is bent a little when I had to pry it off. My guess is that it wont go back on very easily. Is it worth the hassle of fighting with this thing on a daily bases trying to figure out why it's not working.

Go to google...click "images" in upper left corner...never mind, here, I'll give you the link
..woodruff key - Google Image Search