New Here! Finally going to purchase my first ATV!!!

Since I was a kid I've wanted an ATV and the time has finally come. Very excited I found this forum especially since I've got my sights set on a 2005 Sportsman 500 H.O. it seems to be in really good condition with 2400 miles and a second owner who bought it from his best friend. The person seems very legit and honest. I guess I'm posting one to introduce myself and two to get any and all input on this machine. Thanks in advance for reading this and I look forward to reading your responses!

2004.5 sportsman 400

Ok I just bought this used and the cv boots are toast so I want to just put new cv axles in but I'm now realizing I got a weird machine. So on mine I have in inner u joint. I'm wondering if I can get a inner cv joint axle with the Male spline will that work and what years may that be. Also this machine has 4000 miles I have road it 30 miles then seen grease front the cv boots, what other stuff should I be looking for while it's the winter and would like to get it running nice for summer.. these are some pics of my front to give u a idea..
Never work on one of these so bare with me.

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2007 Polaris Sportsman 700 Efi, no power

I have a 2007 Polaris sportsman 700 efi. Went to move it for the first time in a few months and the battery was dead so I jumped started it and as soon as I took the cables off it would die. I bought a new battery charged it same thing. Checked the solenoid and it’s fine. Not sure if it’s the Ecm or not. Was running fine when parked.
Any help is appreciated thanks in advance.

Polaris Predator 50cc question

I have a 2004 Polaris Predator 50cc kids quad. It will start and idle but stalls when the throttle is pressed. If the micro switch in the throttle assembly is jumped out, it will run at any throttle position, but will not idle.

Any thoughts?

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Light bar problem…

So I installed a relay for all lights to be on at the same time on my 2018 sportsman 450... I deleted the handlebar high beam headlight and wired a light bar to it... the problem I’m having is... when the machine is running and I turn on the headlights... it kills the machine? Any ideas why?

Scrambler four wheel drive problem

Hey I have a 2005 500 scramble 4×4. Last year the left axle snapped on me. I replaced axle and U-jont and the armature. Checked fluid level and it seamed to be magnetizing. After trying it out after the "repair" lol the front wheels activate on a hit-and-miss basis. I had it in the shop two times now, both times they said everything checked out good. Both times I picked it up and test rode it 2-3mins around the parking lot all four wheels would hook up and spin. To shorten this, after it gets up to operating temperature both front wheels quit pulling all together. HELP. Thanks.