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Old 10-11-2019, 10:09 AM
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Hello everyone!

About 8 years ago I was at a local race track and saw a guy who built a "cooler kart" to get around the paddock. It was just a large ice cooler sitting on tube frame that the rider sits on. I thought it was neat as **** as it served two purposes, transportation, and keeping cold beverages! Ever since, I've wanted to build my own, but it seems that for whatever reason, one project or another has taken it's place. Now just might be the time to finally get it done.

Over a few weeks I've been collecting information on DIY builds, parts, etc from various websites, including this one. Thus far I've put together a parts list of about 95% of what I'd need just to get my head around the budget needed for the project.

Being a draftsman for over 30 years, I like to make a drawing for everything. I'm not much on just "figuring it out as I go". Right now I've got a preliminary design for the basic frame, but I'm missing several key dimensions to make it more final. If you guys can help with those and other items it will help me to finally move forward on this overdue project of mine.

Here's my current (very) basic plan. Stay tuned for a drawing later today. Please feel free to ask questions, offer suggestions, provide input, etc.

Frame:

- 1"x1" square tubing.
- Overall dimensions of the whole thing can't exceed 48"L x 37"W
- Cooler itself will be a Yeti 65

Wheels/Hubs:

- 4.10 x 3.5 (HF)
- Double-Flange Hub w/5/8" bearings for the drive wheel
- Single-Flange Hub w/5/8" bearings for the drive wheel

Engine/Driveline:

- Predator 6.5HP 212cc
- 60T #35 Sprocket
- 12T #35 Centrifugal Clutch

Speed Control/Brakes:

- Combination ATV thumb throttle/hand brake (handle bar mount)
- 4" Band brake

One design hold-up right now is how I want to do the steering. I'm leaning toward a T-handle bar design (vs. a wheel) so I can use an ATV thumb throttle and hand brake. The thing is that made for a 7/8" diameter tube, and I'm not sure where I'd source that size tubing. I'd like to use EMT conduit or something to keep it simple and light.

Another design issue I have is I don't know the actual dimension of the engine in relation to the drive wheel/sprocket, so I can't finalize the rear axle design. I plan to weld a pair of 5/8" bolts onto the end of a 1" square tube for the rear axle. Really I'm trying to avoid buying the engine/wheels/hubs etc up front before I finish the design. The one caveat is the engine is on sale this weekend for $97 and that's hard to pass up! I guess if I pull the trigger on that then I'm committed right?

So you know what I'm working with, I'm decent welder as I've built roll cages for four race cars as well as many other small projects. I also have a drill press, plasma cutter, Evolution chop saw, horizontal band saw, and most basic hand tools.

I'm open to any and all suggestions, information etc, so please fire away!
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Old 10-11-2019, 10:17 AM
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Do NOT use HF tires! They will disintegrate and are very dangerous. The hubs and bearings are also terrible.
Invest in some quality rims. I would get some steel split rims from www.ombwarehouse.com
Otherwise, can't wait to see it come together!
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Old 10-11-2019, 11:14 AM
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Quote:
Originally Posted by JTSpeedDemon View Post
Do NOT use HF tires! They will disintegrate and are very dangerous. The hubs and bearings are also terrible.
Invest in some quality rims. I would get some steel split rims from www.ombwarehouse.com
Otherwise, can't wait to see it come together!

Thanks for the info.

I was planning to use these hubs (which include H.S. bearings) but I don't see any wheels (on the site you linked) that use the 2-13/16" bolt circle.
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Old 10-11-2019, 11:30 AM
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How about just get the whole rear wheels package?:https://www.ombwarehouse.com/5-steel...-sprocket.html
It is about $115, but it comes with the entire wheel/hub/bearing/wheels/tubes/tires set. Pretty great deal actually.
And trust me, when it comes time to change tires, you will want split rims
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Old 10-11-2019, 11:36 AM
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Quote:
Originally Posted by JTSpeedDemon View Post
How about just get the whole rear wheels package?:https://www.ombwarehouse.com/5-steel...-sprocket.html
It is about $115, but it comes with the entire wheel/hub/bearing/wheels/tubes/tires set. Pretty great deal actually.
And trust me, when it comes time to change tires, you will want split rims
If that was for a set of four I'd be all over it, but it's for just two.

Based on your recommendation I've been looking at other split steel wheels though, and I'd like non-studded tires if possible, This thing will be on pavement 99.9% of the time. What I'd like is a dirt cheap pair of used up slicks just for looks.
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Old 10-11-2019, 11:40 AM
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A set of 4 won't be that cheap.
You can get sawtooth tires for those wheels at www.bmikarts.com
As far as used slicks, you're on your own looking for those.
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Old 10-11-2019, 01:33 PM
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If I step up to a 5" wheel, how about these tires on these wheels?
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Old 10-11-2019, 01:36 PM
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The tire link just leads to Tractor Supply's home page.
Those wheels look good, just make sure you get some good tires suitable for a kart.
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Old 10-11-2019, 02:00 PM
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Not sure why the link didn't work, but the tires are smooth design 4 ply. Remember this isn't a high-speed kart. Via the on-line calculators I'm thinking about 20 MPH or so.

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Old 10-11-2019, 02:02 PM
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As long as they're about 4" wide for a 5" rim, those should work really well.
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