The bike has sitting for 19 months in the garage and it doesn't start with one try, it doesn't seem to be running on all cylinders either. what could cause this and how could I fix this?

SOURCE: 99 kawasaki 600 no fire compression on 2 cylinders

broken crank shaft, broken piston rods, broken cam

SOURCE: What causes premature wear in the rings and bore of BMW K75s?

the K75 has very reliable engine .. its unusual for it to fail in this way .. the frozen rings would suggest overheating and thats possible if the radiator fan fails (that happens often before your 80,000) .. many of the pre 1990 k75s would smoke after storing for awhile .. that was a ring gap positioning problem .. that was corrected in newer models .. the smoke however would not have damaged the cylinders .. maybe in the extreme could foul a plug .. is it possible that someone put something in your gas tank ??.. or could it have been run without oil/water or perhaps the wrong type oil (like transmission fluid) ... that engine should have lasted longer than most cars .. nice smooth bike ..

SOURCE: KTM 625 SXC Bike wont start.

Classic dirty carb problem. You will need to pull the carb off. Soak it in a gallon carb cleanerwstariner($15)-available most auto parts stores. Get a set of torch tip cleaners($5) at Lowes/HD. A can or two of carb cleaner spray. And a good source of compressed air with rubber tip air nozzle. Best to let it set for atleast 2 days in the cleaner. Bottom out any adjustable screws and right down # of turns for easy assembly. Pay attention to all the little air/fuel circuits theres even 1 in the float bowl that does a hard 180 thats tough to get clear. Thats where those torch tip cleaners will come in handy. Blow every circuit with air---watch out for any orings stuck in the carb they wiil fly across the room never to be found again. You usually can reuse the all gaskets so no parts needed.