Agree with above post. Vinyl and bodies (when you can get them), but even that is seasonal sales for the local guys.
Very little mark-up in the karting industry. 10% on most things - 20% if you're real lucky.
Invest a LOT, make a little.
There is some money to be made in labor and skill intensive stuff, but not worth messing with the parts end in my opinion. Now, with that said, parts sales at the track can be decent, but again there's a huge outlay of cash for inventory (and enough to keep everyone happy no matter what brand of chassis or engine they run.)
Most temporary jobs are paying $15/hr now -- I'd highly suggest that as an alternative. For the hours I put in here, I'm certainly not making that much, especially after overhead and inventory taxes. You'd also have absolutely no headaches or paperwork when you punch the timeclock each day -- there's something to be said for that. Whether it's pushing a mop or burning french fries, $15/hr with little responsibility is not a bad deal, especially if you can sock every bit of it away for your kart expenses.
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Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cut
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www.CarlsonMotorsports.com
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33 years of service to the karting industry ~ 1Cor 9:24
Linden, IN
765-339-4407
bcarlson@CarlsonMotorsports.com