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If everything is hooked up identical, as best you can tell, you could swap the carbs between ATVs and see if the issue follows the suspect carb to the other ATV. This would confirm the carb is the problem.

Only other thing I can think of is if there is a screw adjustment you could count turns to bottom on the one that runs, then set it back to factory setting. Go to the other carb and screw the adjustment screw all the way in and then count out the same amount of turns. Do not apply too much pressure on the screw when it stops. Can damage the seat. At least then you would know that both carbs are set the same.

Just thought of one more thing to throw out there. I know on my granddaughter's little ATV I had to pull and clean the carb. Replaced some of the fuel lines too. Had a heck of a time with it not wanting to run right after putting it back together. Best I could come up with was installing the new fuel lines I created a small section that dipped coming from that gas tank and then ran upwards every so slightly to the carb. I think it made it harder to fill the fuel bowl on the carb. Rerouting the fuel line so it progressively ran down hill to the carb made it run great again. May not be your problem, just something else I thought of.

Congratulation it looks fantastic I really love mine

Thank you, what year do you have?

Oh, and not had a chance to clean it from those two rides. Last two!

Have to wait until Monday when I get off for more pictures. And I will post them for you guys. Thanks! I parked it in the garage because there was heavy rain coming. My wife joked with my daughter that I had my nearly new F150 parked out in the rain. Claimed I bumped my head when purchasing it, lol! I kind of wished it had the bench seat like the 450. At the same time, I can say the bucket seats are very comfortable. Have no idea how it compares power wise to the 450i. I have had it up to 54 mph, only for a couple of seconds. Doubtful I will take it over 50 again. Just not much need. Some of the things it came with I really wanted, especially the windshield and roof. It has a nice finish on it, it looks painted.

On my grandson's old Kymco 90 the spacer is removed. Has caused no extra wear on the belt. I think you will be fine.

Guess I will just wait until next year then. Like Pa-outdoorsman I got a very good deal on my 2014 MXU 450i leftover in 2015. Dealer was just a few hours away in VA. from me. They made it well worth the drive at that time. I have two 450 ATVs, a Yamaha and the Kymco to ride. Just me and the wife are getting no younger and thought a side by side would be nice. Could even ride some of the younger grandchildren too.

You will be pretty safe at the 100 mile mark for the first change. Think that is when I did mine. I used 0W-40 mobil 1 in mine. I would just be careful not to use any energy conserving oil.

Took me a while to find it. Did Ebay search but you must have bought the last one. Finally it dawned on me to do a completed search! Yea, I am old too! I contacted them and they have one on hold for me when it arrives. Should have shipped or will ship very soon. I think the lady said they had a pair arriving around the 15th. Thanks!