Another class option to look into is the rapidly growing DD2 (Direct Drive 2-speed) class. The engine is a Rotax DD2. What this motor is, is a high power version of the Rotax TaG engine with a 2 speed gear box added and also a direct drive system which uses no chain. They are competitive with the TaG 4-cycle engines, however the only on-track test against these karts was when the DD2s ran hard tires, they most likely will be quite a bit faster when on the same tire.
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Rotax engine are the ONLY engine in karting that come with a warranty. The warranty is for one year.
These engines get very similar life to a TaG motor, which is 40-45 on a top end, 50-55 on a bottom.
No chain means a lot less maintenance. The biggest consumable on a kart is the chain, TaGs go through one every 3-4 days at the track, shifters every 5-6.
They run within 0.5-1 second of a stock moto shifter on the track, they are fast.
You have more options for racing around the country in a DD2 then you do in a stock moto, however both have more options than any normal karter will ever use.
In state they race in club, RMAX (Rotax Max Challenge), and CSC
They are a sealed engine package, only certified service centers around the country can work on the engines, this keeps competition very close as engines are all equal.
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The class in Colorado is new to the CSC this year, so number of competitors is up in the air, however we have sold a good number of them this year.
Rotax parts are expensive, you have to replace them a lot less then other engines, but the parts are expensive when you do have to replace something.
They are a sealed engine package, some guys like to do the maintenance themselves.
Like Jeff said, call us at the shop with any questions.