My 2000 426 is my street/trackday bike. At the end of last fall it got really hard to start. Come spring,I checked the valve clearances. All good and it starts on the second kick. Still fast. Change the oil. Day 2 return to hard starting, still fast. Day 3 strands me at the gas station. I do not have enough compression to need the compression release. check valves ,clearances good,everything is moving properly. So I pour oil in the cylinder,put the plug back in, still low resistance. Off with the head I suppose. I have no idea of the hours on this machine so I will do a top end, and I want a 450 exhaust cam anyway. Do I have to remove the cams to remove the head? I guess we'll all know this weekend how it looks.