FIRST BUILD- Vintage Bike, and TECUHMSEH 3.5HP GO-KART MOTOR

Hello guys! I'm Christian, and 16 years old. I have blacksmithed for 9 years and been welding for about 9 monthes. I had an old bike that my grandfather gave me and an old Tecumseh 3.5 motor that went on my Go-Kart. So what do I do? Combine them! I am a new member, and this is my first post, and my first build. So please give me any tips and ask any questions! Thanks! I'm taking the pedals off, so I guess it's legally a motorcycle xP
P.S. My mig welder is broke and I'm to lazy to fix it, so I am using my SMAW welder, so most of these are tacks till I get the mig welder working cause the tubing is so thin and all I've been doin is burning holes. xD So sorry if the welds look nasty.

Gear Ratio question: I have a 12 tooth gear on the clutch that will go to a jackshaft that will go from an 18 tooth (connected to the clutch) to a 52 tooth which will run to a 24 tooth attached to the rear tire. How will this perform, or should I use a different gear on the jack shaft? The 12, 52, and 24 are pretty permenant, cause I'm using the original 10 speed gearing the bike came with. But I'm just asking how one set up will act to give me an idea on how my bike will perform. Cause I am going to make mine shiftable using the shifter the bike has.
Wellp, Here it is!

 

[AnvilBlockForge]

Heres the Jackshaft I'm workin on xD

 

[AnvilBlockForge]

Safety

So I am making a front suspension and having front and rear disc brake. What else can I do to make this thing safer cruisin at 35mph? Or will it be just as safe as a motorcycle?

 

[5-7HEAVEN]

Heres the Jackshaft I'm workin on xD

Tanks for pics. Now I know what you're gonna use for that jackshaft.

 

[5-7HEAVEN]

So I am making a front suspension and having front and rear disc brake. What else can I do to make this thing safer cruisin at 35mph? Or will it be just as safe as a motorcycle?

I don't think 99.9% of motorized bikes will be as safe as any motorcycle.

What else can you do? HD rims, quality tires. Use a motorcycle helmet, motorcycle or construction boots and dirtbike protective gear.

And ride defensively.

 

[AnvilBlockForge]

So I used the lathe to cut the shaft down to fit in the bearings. Now how do I keep the bar from sliding side to side and how do I attach the gears to where their adjustable so I can align them to the other gears. Good explanations and pictures please. Thanks! I have a few ideas, but I'd like to use one that's full proof.

 

[5-7HEAVEN]

What diameter is the shaft?

Sprockets have setscrews which hold them to the shaft. Once perfectly aligned, I've also seen sprockets welded to the shaft.

 

[curtisfox]

Is that a lawn mower bearing houseing you are useing? if so most of them were a metric size just under 3/4". If you go to a parts store you might be able to find some 3/4" shaft bearing to fit the houseing............Curt

 

[AnvilBlockForge]

Not sure the diameter. Its an old Go-Kart hub. I already have bearings in the hub, I just need a way to stop the shaft from sliding side to side in the Hub and a way to mount the sprockets.

 

[curtisfox]

Make sure it standerd size. You can buy locking collers at a hardware stoe they slip on and have a set screw...................Curt

 

[AnvilBlockForge]

Ok! Will do! So what, like Northern Tool, or a lawn mower shop? And what would be the best way to attach the gears to the shaft?