just traded my mint rebel for this gs500f looked it over briefly seemed ok miles are low tires are beat little scratches here and there tanks in solid shape figured id give i a go kid pulled up with it and i put the rebel in the back of the truck for the ride thing was awful on the highway.. well anyway. ran it for a while yesterday took it on the highway i got oil coming out of the airbox mind you ive loaded and unloaded this bike from a truck so it was expected. my brother then cleaned the airbox out and delivered it to my work about 12 miles so i can ride it home no more oil out of the airbox when he dropped it off so i was pretty content well i get about 11 miles into my ride and some Buddha Loves You is smoking burning the shaZam! out of oil so i get it home and check the level its pretty high hot. i need to know where i should start first to be honest. compression? should i drain the oil and put a new filter and new oil in it and let it burn the left over oil out of there and see what i get im pretty upset rebel had no problems literally got it put new tires clutch and brakes then wanted to get rid of it but now im mad haha please help
First, make sure that there is no gas in the oil. You can usually tell if the oil is diluted by gasoline by the smell and the way it feels. If there is gas in the oil, you will need to find out why--some kind of carb problem. If the oil is OK, drain some so that the engine is not over filled. Let us know how things go. Once you get your GS sorted out, you will enjoy riding it--the GS is a rocket ship compared to the Rebel.
White smoke is typically not oil burning, that would be a bluish color smoke. Usually white indicates coolant burning, but seeing as it's a GS I suspect that maybe there is just some water in the engine from condensation.
Could be if the bike has been sitting or only taken on short rides and hasn't gotten up to temperature properly.
Used bike purchase usually means an oil-change is due anyway, keep an eye out for any sort of milky-white substance in the oil that will indicate the presence of water in the oil.
Usually the solution to this is "run it 'till it burns it off". Oil and water don't mix so flushing water out of the engine is usually a losing battle, but water boils at a much lower temperature than oil so getting the bike up to operating temp and just letting all the moisture steam off is really the best fix.
ajensen is probably right, it's most likely over-full on oil. If you get 1/4 quart too much oil then it will smoke a lot when running, and it'll also leak from the crank seal under the signal generator on the right side of the engine, I know this from experience. Far and away the easiest way to ensure this isn't the problem is to change the oil and filter, ensure it's not over-full, and make sure you are checking the oil level with it on the center stand.