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Since it is a 2 stroke it requires an oil /gas mix . My guess is either the oil injection pump has quit working or it was out of oil . A lot of LT 80 owners just premix the gas and oil and forget the injector. Here are instructions stolen from another forum on completely removing the injector pump. Most owners recommend a 32/1 oil mix although some say a 40 or 50/1 mix works for them . I'd go with the 32/1. LT 80 Oil injection/premix If you want to DC it, I would just pull everything off and keep it in the event you ever want to put it back on. Chances are you won't, but it would only take a minute to put it all back on if needed. To disconnect, pull the cover on the left side where you access the clutches. (not the small round one, but the whole side cover).. There will be a plastic piece on the front clutch that turns the oil pump, just pull that off. If you just want to DC it and leave everything intact, that should be all you need to do. You probably could plug the hose coming from the resevoir and then hook it back up, but not sure if that's necessary to prevent some minor draining into the carb. To completely take it all off........... Disconnect the hose coming from the oil resevoir. If you want to keep it attached, plug the end and roll it up and wire tie it out of sight. If you want to remove the pump itself, you can fabricate a cover that will bolt right on. Use the bottom of the pump as a template. Or you can order a block off kit I believe. Pull the tube from the carburetor and plug that hole.

Oil cooler systems are not usually high pressure so I'd suggest just taking one of the old lines to a shop and see if they can match up the fittings . If they have compatible ones they can easily fab up new lines for you. If you are going to an aftermarket cooler, you just need to be sure the fittings to the block are compatible. Use whatever hose you want, whether it be regular low pressure oil line hose or fancy steel braid covered. A shop that fabs hose can tell you whether high pressure hose is needed , but I doubt it .

Couldn't find a free service manual or wiring diagram . If you have no power to the lights or anything then the problem is in a mater relay if there is one , or in the ignition switch . Not turning over on the starter could be a safety switch or the transmission is not in neutral . Start at the battery positive and ground and trace the wires out . Check the neutral switch and safety kill switch. Check any and all relays . . Once you find out why the starter doesn't work with the start button you may also find why there is no spark. No spark could be the stator, pickup coil CDI box or coil. Most of those you have already replaced . Take it step by step from the battery out check connections for corrosion and wires for breaks . A wiring diagram helps a lot , but methodical elimination will do the job . You could try looking at the wiring diagrams of other arctic cat models for qa clue of how they are wired . Most likely they are all wired very similarly if not identically .