Hola, I haven't been riding my YZ much since December 2010 as I have gone to the dark side of racing atv's, but have noticed a few issues with my bike when I've ridden it a couple times this year. Lately it's been puking gas out of the vent cap on the gas tank. Enough gas to make a mess of the fender and it has never done this before. I have also noticed it will occasionally puke coolant out of the black tubes that run along the frame. Temperatures have been mixed between 80's down to 50's. Riding style has been 3rd through 4th gear but I seem to notice the issues crop up when I'm riding through tight terrain in 1'st gear. I have also noticed a hissing noise coming from the gas cap when I shut the bike off after riding for awhile. Any ideas on where to look?