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Like the title asks. Wondering who has the most miles and hours on a 450 with nothing but normal maintenance? Asking you UTV guys because there seems to be 10 times as many of you as the ATV owners.

Not sure on the 270 but I seriously doubt it is much lower than our MXU450. The MXU 450 calls for 147ft. lbs. of torque and also requires red locktite. It may very well be working it's way loose. Which if it does come off can be terrible and cause a lot of damage inside the housing. I recommend you shut it down until you have time to get locktite  and torque it much higher. I don't like guessing on those numbers but Arctic Cat also sells the 270 under their name. You may very well find more information about the 270 searching under Arctic Cat online. It would be shocking to find that the CVT was any different. I am running an Arctic Cat XC450 cvt sheaves that have been machined for faster acceleration in my MXU 450. I would also leave the cover off and either block it up or ride it yourself and look over the CVT system to make sure everything is right, Then install the cover. I would not allow anyone else to ride it with the cover off as that can be dangerous.

Let me edit that, Arctic Cat calls it as a 300 but it is the Kymco 270 motor, drivetrain.

Last edit, :https://support.countrycat.com/posts/1420615-2017-alterra-300-service-manual
That should give you the information you need for torque values, it is considerably lower than the 450 but higher than 30-40. Hope that helps you out some. Only other thing I can think of is maybe it needs to break in some. The speed should be 38 with the drive boss you installed. I have a niece with the Kymco 300. I'll try to get up with them and see what theirs will do.

Good to know. You got it back together?

I would have to wonder if the guy thinks that is the problem why he doesn't install a fuel pump first. Wouldn't it be so much easier to sell an AYV running than broken down? Wouldn't it be worth so much more money running than not?  It may be that simple but I would ponder a guess the odds are stacked against you.

It's dark now but if I can remember I see if I can find it tomorrow on my MXU 450.

Check battery first, then connections and grounds.

You may have to pull it and measure. Then punch the numbers in this sight here:https://www.bearing-king.co.uk/bearings/all-bearings
Bearings are generally pretty standard and bought by most every manufacture. Not brand specific such as Kymco, Yamaha or Honda for example.

Electrical troubleshooting can be trying at best. Middle daughter just called a little ago. No AC at her house. Got lucky, or so I thought, and found three wires that had chaffed on the edge of the blower housing. Separated them, wrapped them with three layers of electrical tape and we have compressor running and no blower. Only 83 in her house. She's going to have to call an AC repair guy. That was the limit of my knowledge. Hope you have better success, lol!