I found the video on YouTube (yours wouldn't play). I don't believe it just because that guy said it but it made me curious enough to look. I'd never heard of a 1000cc limit on engine size for ATV/UTV. After a little research here's what I found.
There is no hard RULE against having more than 1000cc engines BUT apparently anything larger falls under a different classification under EPA regulations for emissions standards!! I didn't read all the regs. It would take several days even if you're a fast reader lol.
From what I gleaned with a fast look, larger engines would fall under a different classification than "ATV" requiring a lot of the same emissions equipment found on you family sedan. That's why the manufacturers are, at least for now, limited to 1000cc or less. There is an exemption in the regs for machines that the manufacturer can show proof will be sold only for competition use.
The 1000cc EPA regulatory limit applies for ATV/UTV certification for machines built after 2006.
Here's some copy and past from the EPA and a link to the full Regs if anyone's interested in some bedtime reading lol. I threw in some other stuff I found too... Happy reading!
This is from another forum:
While reading this article ---> 2017 Arctic Cat Snowmobile Lineup Unveiled - Snowmobile.com, there is one paragraph that contains the following sentences. "The Genesis motor was a 1049 where this new C-TEC4 from Yamaha is 50cc. smaller. Why smaller? The good ol USA has a governmental regulatory agency called EPA Environmental Protection Agency where it codified that the biggest four-stroke motor any UTV/SxS builder can stuff into the vehicle is 1000cc. This forced Yamaha to overhaul and reengineer the Genesis to be a 998. And with that came that product created on the eighth-day, a turbocharger."
EPA documents and regs:
Offroad Utility Vehicles
Offroad utility vehicles are subject to the
equirements as ATVs
Offroad utility vehicles are defined as
engines with displacement less than 1,000 cc
max brake horsepower less t
han or equal t
kW (40 hp) and
max vehicle speed of 25 mph or higher