2 gears? Really?
Low maintenance KZ, right here:
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Strictly speaking that isn’t KZ.
low maintenance? or are you kidding?
Kz is very reliable IMO, jet a notch richer and it will run forever 
When I’m just practicing I run 4-5h with piston, and new piston for each race. Just get the ring on to proper gap and in with the new piston and bearing.
Bottom end really sturdy, as well. 10h easy, but I change stuff within 6-8h
For the amount of fun, easy worth it. IMO wrenching is a part of karting, the knowledge is equal fun as the driving
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Here in middle europe the dd2 class is pretty popular. We have quite big fields here. I run the dd2 also and pretty like it. I did run kz2 but its more expensive and complicated compared to and it makes still alot of fun to drive.
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Ive had my dd2 for around 7 years and i was the third owner, I’ve never done a bottom end and only do the top end around 15 hours.
I also run 100cc stuff that is 3 hours on a bottom end and 1.5 on a piston so have both ends of the spectrum.
The dd2 is great for just turning laps and doing no stress club level races, charge the battery and pour some gas in and you are good to go. Anyone can do it even if you don’t have alot of time. A KZ is far too physically demanding for the average person to go out once or twice a month, especially once they start getting a bit older, and I believe that’s the demographic that karting should be targeting people 35 plus that aren’t just looking for a stepping stone into cars.
Yeah if you just want to turn the key DD2 is the perfect choice 
Wow that’s pretty tight, I run at least 2-3h on my pistons on 100cc. And big end bearing every 3h
I started replacing pistons every 40mins by the end 
Haha whoppa
I just inspect for cracks and measure them then send it
Interesting thread - I’m debating with myself between DD2 and paddle shifting KZ later this year after I’ve bought my boat (polar opposite hobbies )
The DD2 maintenance schedule officially is pretty relaxed - what’s the reality?
Piston you can go easily atleast 15 hours, total revision i would say something around 35-40 but only to be on the safe side. The right oil will help you achieving this.
I ran briggs and stratton and now DD2 and I say that DD2 is less trouble then briggs loll…that was my goal, go as fast as I can with the less amount of maintenance. And be able to race club races and provincialy also. DD2 is expensive on tires that’s all. Sometime debating KZ but looking at guys and post everywhere it seem a crazy amount of maintenance compared to the DD2. Just my opinion. Some people love the mecanic part of it and it is as much fun as driving, not me. I want to drive as much as I can with basic maintenance. In the DD2 the fun part is that there is no chain and the clutch is dipping in the transmission so no maintenance…just change the oil once in a while and clean the wheel bearing and clean the air filter. Tight up all the nuts and your good to go. Each day of riding of my DD2 I pass maximum 30 min on maintenance and cleanning. About 100 laps for 30 minutes of clean up and maintenance is pretty awesome to me! You do your session and you can chill out with people on the side of the track. No need to oil a chain…a lot of people desagree with me haha 
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We are on the opposite ends of the spectrum here which is totally cool of course:). I love the working on karts at home in the garage and at the track. When I raced the long circuit scene in the UK it was a big advantage to understand what to do or change on your engine/chassis between races. If you didn’t have that skill set you would be at the mercy of your specific tuner that would also be tending to other racers with problems. When I got back into karting recently here in the states I had never heard of a “tent program” and finding interesting how many people rely on them.
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Is that because it has a starter?
Engine: top end @ 100-140 L (26-37 gal); bottom end @ 400-440 L (105-116 gal).
Pretty much like stock moto intervals.
As far as “ultimate” goes, for sprint tracks it has to be KZ. Nothing else is as physical, as rapid, or as quick. On road courses 250 twins with wings are the pinnacle. My opinions only of course.
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I think that plus more conservative porting.
My understanding is that the difference from the rest of the KZ10 series is the ignition. K9ES did have its own cylinder.
KZ is a class by the FIA that requires homologation. If the engine isn’t homologated, which this isn’t, then it’s not KZ. Engines maybe based on the homolgated product, the engines might even have KZ in their name somewhere, doesn’t make them KZ.
I know it’s semantics, but still, what semantics is our currency in racing.
I think we should differentiate gearbox from single-gear. KZs are still heavy lumps. Anything over 145kg is a bit too much imo. I’d prefer <130kg to be completely honest on shorts.