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Chain and sprocket ratios.

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Wing master View Drop Down
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AKA StraightShooter

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    Posted: 08 July 2021 at 16:33
I have an old go kart that I drive my grandkids around the neighborhood on. It's an old frame from I guess the 60's. Kinda a piece of junk but we have so much fun riding it. 

Anyway, The centrifical clutch is starting to go out. I'm looking at ordering a new one. The drive sprocket comes with the clutch as a unit. 

Originally, The go kart had a 5hp briggs and Stratten on it. When I replaced the engine I put an 11hp engine on it. It accelerates really well but the top end isn't quite as fast as I'd like. 

I haven't counted the teeth on the axle sprocket but I guess its around 80. I can count them if I need to. The drive sprocket has 9 teeth. 

I'm looking at clutches and they offer 9, 10, 12, or 14 tooth sprockets. How much bigger can I go and still be able to take off from a stop? I assume I have enough HP but don't know how much each sprocket will change the ratio. 

Any help would be appreciated. 

Wing master
I have always considered myself to be quite the bullshitter, But ocasionally it is nice to sit back and listen to a true professional......So, Carry on.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wing master Quote  Post ReplyReply Direct Link To This Post Posted: 08 July 2021 at 16:40


Edited by Wing master - 08 July 2021 at 16:41
I have always considered myself to be quite the bullshitter, But ocasionally it is nice to sit back and listen to a true professional......So, Carry on.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Irish Bird Dog Quote  Post ReplyReply Direct Link To This Post Posted: 08 July 2021 at 17:46
no help here with your sprocket dilemmaConfused D but checkout WM's neat ride & even neater Rider.....Thumbs Up
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Posted: 08 July 2021 at 19:03
https://www.blocklayer.com/chain-sprocket.aspx

How fast do you want it to go? Measure the drive tire around to find how many Inches it is.
63360" in a mile divide it out to fine how many times it has to turn to make a mile.
Then use the calculator.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BEAR Quote  Post ReplyReply Direct Link To This Post Posted: 09 July 2021 at 06:11
The teeth all work on the same chain links, so just measure the diameters of the sprockets.  the teeth will be proportional to the diameter.

if you go to 10...you will get 10% higher top speed, with a 10% reduction in torque (starting/acceleration).

If you go with a 12 you will get a 30 % increase in top speed, but a 30 % reduction in torque/acceleration.

Remember as you go up in top speed, you lose torque and will get to the point were you don't have enought torque to push you to the top speed.

That said I go with a 10 tooth.


Also remember that 11 hp was when new it is probably less now.  Also how fast do you want the kids to go????  especially when your weight isn't in the cart.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wing master Quote  Post ReplyReply Direct Link To This Post Posted: 09 July 2021 at 11:31
Thanks guys. 

That's a pretty big change for only a tooth or two. 

I agree that I should go with the 10 tooth sprocket. 10% is quite a bit. 

According to me speedometer app it will top out at 23 MPH as it is now. That should be about right. 

Wing master
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