First Kart, Red Talon has some issues...

[Jimmyjoe]

Hey guys!

I am fairly new to DIY go karts but I'm very open to learning! I just bought my first kart used, it's an old Red Talon but it still runs pretty well. The engine is a Briggs & Stratton Intek, the previous owner said it's a "5BSXS.2051HF" and claimed it has 7 HP but I don't know how true any of that is. I haven't seen any other labels or embossing other than a barcode sticker on the bottom that is pretty faded.
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It starts up without any problems and runs strong! I took it out for a first ride and got it up to about 20MPH! (I'm wanting to bump that up a little bit). It seemed like everything was great! But some issues started showing themselves...

First, when I start it up, the clutch engages immediately and the drive wheel gets going pretty fast. I kind of have to block a wheel and then chase the kart a little bit to sit down in it. Once I'm sat down it's not really an issue.

Then, while I was riding it yesterday the chain came off several times. I initially thought I just needed to tighten up the chain but now I don't actually think that's the issue. One of the times it came off, I noticed that the reason it came off is because the clutch was engaging while I was idling and trying to spin the chain. This was causing the chain to get bunched up in between the clutch and the sprocket and pop off. I also noticed that the clutch has A LOT of play back and forth on its shaft. I don't know if that's normal or not.
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I started taking the thing apart to see what I could find and ended causing more issues lol...
I took the drive wheel off and the bearing just fell apart, I'm definitely going to need a new one of those. And the inside of the hub looked pretty beat up but I think I might be able to reuse that with new bearings. I learned that this hub has 2 identical bearings, 1 on each side. The other bearing wasn't in awesome condition but it still spins and is in 1 piece.
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Pulling it apart even further, I found the clutch pads were non existent. It was just metal on metal, (could be what's causing it to engage while idling and by extension the chain falling off?) The brake band was also basically just bare metal. I know I'm going to need to replace the brake band. I'm wondering if this clutch is even salvageable. The snap ring keeping it on the shaft was loose and all but broke off.
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Now, as far as getting replacement parts, I've been looking on bmikarts.com and have been able to find what I think are the parts I need.
I found the right type and size bearings for the hub as well as a replacement hub and clutch if needed.

I did get a little confused on the right size for the brake band. I kept seeing 4.5" and 6" bands but when I measured my brake band diameter it was 5.5". Should I assume that it was closer to 4.5" and had gotten weaker over time and stretched out to 5.5"? Or is it more likely that it's a 6" band and the prolonged tension pulled it in and made it smaller? Also, if I get a new brake "hub" thing, should that be the same diameter? My initial thought is that it should be a little smaller right? Because the band goes around it? I don't know on that.

Anyway, I tried putting a video in here of the amount of play the clutch has but it wouldn't let me lol. Any thoughts, tips, or advice it more than welcome! I want to get this baby working again, and then I want to make her go faster!

Okay, update! New information!

So the chain is 1/2" on center between rollers so it's a #4x. The bore on the clutch shaft is 3/4" so I think this clutch should do the trick. I'm just not sure if it comes with needed spacing washers.

For the brakes, it looks like 4" band will work fine. But I'm now looking for the correct drum. I think this one will work but I'm not sure about the "bolt circle" measurement. From one bolt to the next is 2 1/4" on the old drum so I don't think it's right. Here's a better picture of the drum side of the sprocket.
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Also I noticed that a lot of the drums have a keyed center hole. But I don't think I'll need that because it's bolted to the sprocket and will have a bearing pressed into it.

I finally found some stamped letters/numbers on the engine.Hopefuoly someone can find something with this.
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120202 0417 E1 041209 FE

Have a 122012 0127E1 myself mine is a 206 cc yours is a 205 or a 206 cc made in 2009.
Would get a new clutch and chain.