gearing

[bbullsj]

I have a gearing issue on my go kart. not sure what type of kart it is but it has a predator engine on it. I found that the clutch is slipping and gets super hot and smells. Its a centrifugal clutch. The clutch has 10 teeth and the axle gear has 28 teeth. What can I do to get this working?

 

[bob58o]

Does it even start to move under its own power? Or do you have to push it to get it rolling (or start down hill)?

You are going to need to replace that 28T sprocket with something much, much bigger.
How big are the tires? They look to be at least 18". Maybe 20"?

Give us pic of the whole buggy. It looks big too.

Big buggy with big tires needs big sprocket on the axle.
I'd consider replacing the clutch with a 30 series Torque Converter.

You might be able to get away with a 60T sprocket on the axle if you use a TC (depends on tire size and total weight of buggy and driver/passengers).
With that clutch, you'll need about an 80T sprocket, but I'd recommend the TC anyway. I'll need the tire size to give a better approximation of what sprocket you'd need.

Since the clutch has 10T, I assume you are using #420 chain. Sprockets for #41, #40, or #420 chain that have more than 60T are more expensive and harder to find than those with 60T or less.

You'll need to find a sprocket that matches the bolt pattern of your sprocket hub.

https://www.ebay.com/itm/Torque-Con...o5bfbE-:sc:ShippingMethodStandard!60803!US!-1

The TC allows you to use smaller than a 10T sprocket.
This 8T sprocket (search "2182-K" to shop around) will allow you to use a smaller rear sprocket than you would need if you were using a 10T front sprocket.

https://www.ebay.com/itm/2182-K-Jackshaft-Sprocket-40-41-Chain-5-8-Bore-8-Tooth-/140912211000

60T with 8T and the torque converter will probably get you where you need to be.

 

[landuse]

Your axle sprocket is waaaaaaaaaaay too small! You have a ratio of 2.8:1 at the moment, and I am surprised your kart even moves. A safe bet to start gearing at with about 13" tyres is 6:1 with a centrifugal clutch. The larger the wheels and heavier the kart means you will have to gear even lower at maybe 8:1. If you keep your clutch, that would mean a 80T sprocket which is a bit impractical and probably too big for your kart. You are in the realms of utilising a jackshaft here.

I would probably follow Bob's suggestion regarding a TC. It would save you money and headache at the end of the day

 

[J.S.@SMS]

Your kart likely came with a jackshaft from factory. My guess is that some people want more speed out of their kart so they remove that jackshaft. I have this exact same problem on my Manco Eliminator. Predator 212 and no jackshaft (10t clutch driving a 27t axel sprocket). My suggestion would be a torque converter as the others said. Order the tav 30-75 aftermarket ($120 instead of $200) from gopowersports and use the coupon code cc10 for 10% off.

 

[anickode]

Your kart likely came with a jackshaft from factory. My guess is that some people want more speed out of their kart so they remove that jackshaft. I have this exact same problem on my Manco Eliminator. Predator 212 and no jackshaft (10t clutch driving a 27t axel sprocket). My suggestion would be a torque converter as the others said. Order the tav 30-75 aftermarket ($120 instead of $200) from gopowersports and use the coupon code cc10 for 10% off.

Even a torque converter can't handle a 2.7:1 ratio. Gotta change that sprocket. No question.

---------- Post added at 09:17 AM ---------- Previous post was at 09:16 AM ----------

It's also possibly the kart originally had an internally geared GY6 or something

 

[landuse]

Your kart likely came with a jackshaft from factory. My guess is that some people want more speed out of their kart so they remove that jackshaft. I have this exact same problem on my Manco Eliminator. Predator 212 and no jackshaft (10t clutch driving a 27t axel sprocket). My suggestion would be a torque converter as the others said. Order the tav 30-75 aftermarket ($120 instead of $200) from gopowersports and use the coupon code cc10 for 10% off.

He will still have to change the axle sprocket to something bigger. You can also get a chinese knock off 30 series from eBay for about $60

 

[bbullsj]

clutch

It does currently move under its own power but slows down going up a slight incline. I tested it and i'm 180lbs so a kid would be much less but i still want it to function well and not slip and heat up and cause other issues.

Attached are pictures of the full kart and the size of the tires. Sounds like I am going to have to do a 30 series clutch and a larger axle gear, something around 60 teeth.

 

[Tpdingo]

I barely got away with a 12-36 tooth arrangement, and I was running 9" wheels on a tiny 40lbs kart.

You will likely need a 60 tooth on the axle. That should do for now. If you want some serious acceleration, a TAV30 would do fine. Should be a bolt in swap.

If it were me, I'd go with the TAV30 because you probably already smoked your clutch and I wouldn't use it any more.

 

[bob58o]

Sounds like I am going to have to do a 30 series clutch and a larger axle gear, something around 60 teeth.

https://www.youtube.com/watch?v=pele5vptVgc

 

[bbullsj]

Ok, so i'm going with a whole new axle setup considering my rear bearings were shot and causing excessive resistance. I'm currently looking at this:
https://www.ebay.com/itm/Go-Kart-Re...083256?hash=item3fbc7a7b78:g:5EYAAOSw-sNcfeKS

but I will need bearings like these and the flanges to weld to the frame like these:
https://www.ebay.com/itm/Go-Kart-Mi...:KRwAAOSwfZ1WZzc4:sc:USPSPriority!49341!US!-1

My problem now is that the kit is 7/8" diameter and the bearing kit is 1". I can't find both of them in the same diameter. What are some other better options?