I recently purchased a 2007 gsxr600. I'm familiar with gixxers I've had them since I was 18 but never a 600. The guy I purchased it from said he heard a knock he thought so automatically replaced the timing chain it crunk up rode it down the driveway and cut it off. Later it never would crank I purchase it my mechanic got it started once but for only a few seconds to make sure it wasn't licked up. Now it wont crank at all. Just keeps trying and trying but doesn't all the way crank up it wants to but doesn't he took the BAZZAZ fuel regulator out and same issue. Hes went through every sensor plug everything and left him stumped after 6 hours of him and my buddy worked on it. I'm begging for help to what this may be it's only got 22,000 Mike's on it please someone help me.