Anyone know what could be wrong? My 2000 YZF426 has burnt up major oil the last two times I went riding. I'm talking over a quart each time for 4 hours of riding. It holds just shy of 2 quarts. It's not smoking and it's not leaking. I still seem to have good compresion and power. The only thing I can think is my piston and rings need replaced but I have power and don't see any smoke.