Metric vs empirical

Likely just sucked water into the carb. The white smoke is most likely water burning off from being in the fuel. I'd pull the carb apart, clean it good and reassemble. That assumes the white smoke is not blue oil smoke, and in which case it's most likely a seized or cracked ring. But you can tell the difference....burned oil smells like crap and steam from water in the fuel doesn't have a smell.

Hey @cameron walton welcome to Quadcrazy. Nominally the number your looking for is about 120 to 130 psi, 128 i believe is "perfect" as per spec. So its most likely worn piston and rings would be my guess but I would adjust the valves first and make sure they are as per spec. Pretty easy to do : valve spec intake is 0.05 to 0.09 and exhaust 0.11 to 0.15 Get a set of feeler gauges and a 10mm wrench and some loc-tite for the adjuster nuts when your done. Any questions ask away on how its done. You tube has a ton of videos if you need something to visualize. Double check that your head gasket is ok as well. Usually a very noticeable sound when a head gasket is bad. Go with the simple stuff first and go from there. I good valve adjustment may help. See what that does and re asses after that. If no changes then throw a nee piston and rings in and some valve seals while your at it. If you go this route use quality parts including the gaskets.

I would turn the gas petcock off and and add a cleaner a day ahead of you pulling the tank. Let it soak a day this way when you pull the tank things have soaked a bit. I would get the right air filter for the atv.

I am hearing a lot of stories about people getting things done at home! This is a good thing people!! After all this is done we don't have the wives asking us to get it done any longer !!!! Lol 😂 That = plenty of riding time!!! Just got a few minutes from a few hellish days at work and i see the QC community has been busy! Nice to see all the activity!

So i tricked out my daughters dresser! Ordered lights from Amazon!