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Old 05-14-2013, 09:44 PM
Kidskartfun Kidskartfun is offline
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Default New to kart build with the kids help

I just purchased a old one seater frame and tire seat pedal no engine or brakes. I am leaning toward a Preditor 7 engine (harbor freight) with a GTC torque converter. The back tires are 23 x. 9.5 - 12nhs. I don't want them to go fast but they need the torque to climb around the field area... Any direction on sprocket size and am I headed in the right direction? Any ideas for brakes?
Thanks ahead of time!
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Old 05-14-2013, 10:01 PM
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I have my kids kart set up with a 17:1 on 15 inch tires. That gives them about 10mph (He's 5) with tires that size you will probably need a jackshaft setup to get it low enough.
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Old 05-15-2013, 02:07 AM
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You are going to have to gear VERY low with those tyres being so large, even with a TC. I would suggest at least 10:1, but you will have to just see what works for you. You might have to gear lower
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Old 05-15-2013, 08:22 PM
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Thank you how would I get the 10:1 ratio ?
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Old 05-15-2013, 08:34 PM
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Here you go.

Personally I think you will want a higher gear ratio than that for children.
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Old 05-15-2013, 08:48 PM
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I do not have a jack shift? Not sure where to get one. My kids are 13. So a little father will work. Can I go from the gtc to the sprocket ?
Thanks for ur help
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Old 05-15-2013, 08:53 PM
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If you don't use a jackshaft you need to have a 100 tooth sprocket on the axle, and a 10 tooth on the torque converter. What pitch is your chain? I'll try and source you one.
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Old 05-15-2013, 09:07 PM
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Not sure what that means? Sorry. I don't have a chain yet. What chain should I use?
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Old 05-15-2013, 09:34 PM
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I'm sorry, I thought you had already purchased the torque converter. In a short search, I was only able to find a 100 tooth in a 35 pitch, so if you intend to go that route, I guess you are stuck with 35 pitch unless you feel like hunting more than I did.

http://www.mfgsupply.com/az2699-100.html

If you choose to use that, you will need to get a hub that will accept a split sprocket. It has the advantage of being able to quickly and easily change your gear ratio if you don't like the way it's performing.
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Old 05-15-2013, 09:38 PM
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Thank you! I appreciate you're help!
Any thoughts on brakes? It has the pedal linkage and a round part with no drum in it. Should I just complete this or start over?
Thank again!
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Old 05-15-2013, 09:44 PM
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So it has a band brake, or a drum brake? Personally, I am a fan of the mechanical disc brakes, however, with tires that big I think you would be better off going to hydraulic. It is never a bad idea to have stronger brakes than you need.

http://www.bmikarts.com/1-or-1-14-Ca...it-_p_583.html
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Old 05-15-2013, 09:51 PM
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It has what I would call band brakes
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Old 05-16-2013, 02:32 AM
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Quote:
Originally Posted by DaiSan76 View Post
Here you go.

Personally I think you will want a higher gear ratio than that for children.
You would have to gear LOWER, not HIGHER. You got it confused there.

For brakes I would go for hydraulic brakes. You can use some of a trashed motorcycle.

A 100T sprocket is going to be a big a$$ sprocket, but it should be fine if you have 23" tyres. Have a look at these pdfs about sprocket diameters.

Azusa #35,#40 and 520sprocket diameters
http://www.azusaeng.com/Sprockets/AzSDno35.pdf
http://www.azusaeng.com/Sprockets/AzSDno40.pdf
http://www.azusaeng.com/Sprockets/AzSDno50.pdf
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Old 05-16-2013, 03:12 AM
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jackshaft it dude. then you can use smaller sprockets. it's just one extra thing to make, but totally worth it. plus then it would be easy to swap sprockets to alternate between torque and speed.

jackshaft is easy to make with a couple of 5/8" bore pillow block bearings, a 5/8" keyed shaft (3/16" keyway), and a couple of sprockets. run the chain from your 10t clutch sprocket to a 20t sprocket on the jackshaft. then on that same shaft run another 10t sprocket to a 60t sprocket on the axle. that will give you a 12:1 ratio. lots of hill climbing torque, with a top speed of 21 mph.
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Old 05-17-2013, 11:52 PM
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Thank you!
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