the vent tube from the rear diff. is throwing oil all over the front. took screw out and what seemed to look like motor oil came pouring out! what would cause this? 99-00 400 big bear 2wd

Hey guys,
I just bought my first quad yesterday, and this’ll be my first post.
I have a 2002 Kodiak 400 Special Edition. Its in great shape, starts immediately and purrs like a kitten. I have a front end 2500 lb warn winch and itp mud lites on the back (both came with the bike).

i wouldn’t call myself a mechanic, but i know my way around an engine, and have basic-yet-complete tool collection

Right off the bat, i plan to change the oil, grease it up, etc, but im wondering what other changes i should make. I dont have a lot of cash to throw at it, so really, im looking simple/cheap improvements, that will make the biggest difference (if there are any…)

Ideas i’ve found so far are upgrading air filter, jetting the carb, etc.

Any thoughts?
Thanks in advance!

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2001 Big bear 400 replaced solenoid and still won’t start oil temp light lights up when I hit the button. It will pull start and when I jump the solenoids it starts up so starter isn’t bad. Help needed!

Hope to see a change in weather soon so it’s nearly time for maintenance while awaiting for the white crap to melt. I know, most have probably done their maintenance before winter storage.

No idea what I’ll be up against but thought I’d ask about penetrating oil for the bushings/bolts. I’ve read else where that PB may ruin the bushings so figured I’d ask before touching anything. Thanks in advance.

Jas