ok, still having this issue. I have eliminated the battery as a problem. I am now thinking maybe an issue with the fuel pressure, pressure sensor .... ??  if I flip the kill switch it primes, then if I rock the switch it it will prime again, and sometimes it will keep priming and other times it won't. At random it seems it will try and turn over.  ...?

Lights, dash all seem good. Relay, it doesn't click in, we'll it does, randomly, and when it clicks she cranks, my persistence seems to get it started.  I was lookin for a sensor or something, Brake Switch, think you may be on to something here. Where is it? Can I bypass it to test? Would it prevent the bike from starting in P?

I been troubleshooting this for a while.
Thought at first it was a low battery bc a jump start it worked, worked a couple of times but the then with the battery fully charged it wouldn't start and neither would the jump. It's left on 1.5A tender so it should be good right? Battery passed load test, and wasn't as simple as I expected to extract, I took it in thinking I needed to replace it. When I jumped it you could hear the relay pull in so I was thinking it didn't quite have enough juice to pull the relay in, maybe a bad cell in the battery or some reason there wasn't enough current going through despite it showing charged
So now it wouldn't start with the jump, no relay kickin in ....? wt* .. I am now thinking maybe the gear sensor or something along that lines, you know how it won't start unless you pull the break if it's in gear.... I fiddled with the shifter and noticed it wasn't always indicating in the dash the gear, most often in P, then it started ... but it wouldn't start with the break on in H or L or even N ...  coincidence? Only had this result once.  I can't seem to get a consistent pattern to get a definitive answer here.

They have had some ECU mapping issues. I would check with your dealer on any recalls or solutions. Sometimes its a replacement ECU. Other times there are problems with the TPS. That too is replaceable.

I have a 21 and a 22 800xc. (purchased the same time but one came in as a 21), anyway the 22 I had this issue with. It jerked so hard once in reverse I almost went over the bars. Getting close to anything was a nightmare, would just putr in N and push it. They replaced the ECU which made it better but I always hold the rear brake heavy as I throttle up on both these now, (rev and release) every once in a whileit will jack rabbit on me.  (both machines)

.. is this just an ecu problem?

Still waiting on ecu for the 2022, looking like next week. The dealership has three quads there CFMoto sent with no ecu's ! Seems this is a common problem.

...... got the 2021 back, apparently it was randomly misfiring so they replaced the plugs and checked the rest of the system. no error codes though ... ? So far so good, haven't had it out for a scoot yet but it's much smoother! No jack rabbit issues with this one!! lol It's like a totally different quad then the 2022.

This is the best picture I have, wasn't naked too long before I wrapped it, I think by the end of this season I'll peel it off and go back to all black

Any pics with the wrap?

... . If you are referring to the lack of engine brake, there may be a problem with the one-way bearing or belt. Both can easily be inspected. But know even at best, you will only have engine brake down to where the speed and engine idle RPMs cross which is about 5-7mph

I just experienced something like this on my 2021 800XC, but I didn't note my speed. I was going down a steep hill and the engine brake was keeping me in nice control, then suddenly it was freewheeling and I had to engage some more braking, kind of freaked me out a little. I'll have to note my speed next time.

Need some help here !!!
Brand new 2022 Moto 800xc, we have two, and one of the machines is really hard to feather the throttle. The other one is actually in the shop, it keeps stalling and randomly choking out. (it's not the fuel)    Anyway, this issues makes low speed maneuvering really difficult. nothing, nothing, .... nothing ....  nothing ... BAM! You just did a three foot lunge into the tool box!  I think it's odd that it doesn't always do this. Low gear, high gear, 2whl, 4whl ..(hot or cold)  doesn't seem to matter. Sometimes you can creep, somewhat, it is a CVT right? other times you need to just get off the machine and push it because it jack rabbits all over the place, really funny to watch though. I always have my foot hard on the brake when I am precision driving this thing to minimize the hop if it happens, then let up as applicable, of course.

We have had this problem since day one and there is about 450km on the bike now. Dealer said it's an ECU problem? Been waiting two months for a new one. Is that really the cause of this???

Ok, now here's the story. (Hold negative comments, sh!t happens to the best of us!)
The other day I was backing up our little yard trailer, (6ft old beat up utility trailer) slightly turned looking back, trailer on angle going into the spot in the bush just of the driveway nicely, just where we keep it. All was going good and then it happened. It lunged so hard it thew my 210lbs ass forward (though I was about to go over the bars) pushing me into full throttle backwards, jacked knifed the trailer and nearly tipped it over!!!  Luckily I was quick to grab the brake (rider instinct must of kicked in!)  or I would have hit my truck !! Even left a skid mark in the driveway!! Never thought I would ever whiskey throttle an ATV!!