Low end power, possible clutch issue?

[DuckSoup]

Your chain looks like #35. The clutches you listed are for a much larger chain. (#41/420/40) are much larger links. Those clutches will not work with your chain or your wheel sprocket. That is why I suggested an 84 tooth on the wheel, because 12 tooth is the smallest #35 clutch I know about for a 3/4 inch engine PTO. Replace the clutch, chain and sprocket all at the same time so they break in together.

If you don't mind me picking your brain again really quick. I'm going to purchase some parts I just want to make sure I'm not overlooking something.

It looks like the #35 chains have more options for higher tooth sprockets. At least that's what I'm seeing through GoPowerSports site. Maybe there's another shop worth referencing as well?

The first thing is getting this sprocket in an 80 tooth option.

#35 Chain Manco Drive Sprocket

The Manco Drive Sprocket #35 is a high-quality replacement sprocket designed for use with Manco go-karts. This durable sprocket is made from top-quality materials to ensure long-lasting performance and reliable operation. It features a precision-engineered design that ensures a perfect fit with...

www.gopowersports.com

Combine that with this 11T clutch.

11T Centrifugal Clutch 5/8" Bore, #35

The 11T, 5/8" Bore, Centrifugal Clutch #35 is a high-quality clutch that is designed for use in a wide range of applications, including go-karts, mini-bikes, and other small vehicles. With a durable construction and precision engineering, this clutch provides reliable performance and...

www.gopowersports.com

And lastly because the chain I have isn't going to be long enough I was going to get a new chain at 3 feet long, maybe 5 feet if 3 isn't not long enough.

#35 Chain, Choose Your Length | GoPowerSports

The #35 chain is a high-quality and durable chain that is commonly used in power transmission applications. This chain is designed to provide reliable and efficient performance in a variety of industrial and automotive applications. It is made of high-strength steel and features precision...

www.gopowersports.com

I may also pick up a chain breaker to reduce the length and I might need to get a new sprocket hub as well if the one I have won't line up right.

Assuming I did everything correctly this should give me a 7.27:1 gear ratio which according to calculations should be sufficient.

Top speed looks to be around 20 mph but that's okay for this. With the wheels I have I don't think I have a ton of options outside of that.

I also want to make sure I'm not going to run into any space issues given how far the engine is from the sprocket.

 

[panchothedog]

Pull off the sprocket and measure the distance across the holes. Hopefully you can get the 80 tooth to match your hub. Looking at the picture of your existing sprocket it looks like the bolt pattern is quite a bit bigger than the one you are looking at. Worst case, you have to buy a new hub to match. You will not be able to purchase a chain to fit exactly. You will need a chain break tool. The first one I ever bought was their $8 cheapie. I lasted all of one break.Buy a good one. It will last forever. At 7:27 to 1 you should be in good shape with the gear ratio.

 

[panchothedog]

Well it used to be an $8 cheapie. Looks like it's the $14 cheapie now. The clutch you posted is for a 5/8" PTO. Make sure yours is not a 3/4". Buy the right one.

 

[Sparkwizard]

Measure the diameter of your crankshaft where the clutch mounts. It is probably 3/4 of an inch. The 11 tooth clutch you listed is for a 5/8 shaft.
You need a clutch that will fit your engine.

 

[DuckSoup]

With the cost of replacing all those parts I almost wonder if it would be better to just do the torque converter. I could leave the clutch and sprocket as is and according to the calculator it should be compatible.

Thanks for the feedback though guys, I think I've got what I need to move forward. I've got a lot of measuring to do.

 

[Hellion]

With the cost of replacing all those parts I almost wonder if it would be better to just do the torque converter. I could leave the clutch and sprocket as is and according to the calculator it should be compatible.

Thanks for the feedback though guys, I think I've got what I need to move forward. I've got a lot of measuring to do.

It's a learning experience, don't try to rush it. In fact I would "run what ya brung" (what you have) and then upgrade to the end-all-be-all of go kart transmissions, the TC.

And yes it does appear that #35 chain has more sprocket options judging by what is available via online vendors.