it all depends on how much of your oil system has been deleted. if they just unhooked the cable, or lines then i would fix it. if the pump is gone and the case is plugged, well your hands are kind of tied at the point. check it over and see what you would need to do to make it operational. check pump, lines, tank, cable, etc... xlt issue with bearings was because the outside crank bearing (clutch side) didn't get enough oil. opening the transfer ports helps alot, but removing the oil injection won't make any difference. the oil injection mixes with the gas at the cylinders, pre-mix will just be mixed as it goes through the carbs but either way that outside bearing has to be lubricated through the transfer port. I usually just run a very light amount of oil in the gas with the oil injection. it smokes more and I have to run a hotter plug to burn it off, but the sled performs the same and its cheap insurance.
No sledding this season.... sold them both to pay for a wedding.