I have an 08 SXF 450 with about 95 hours total and 35 hours on new top end. I have been trying to figure out why my bike seems so hard to get started & some input would be greatly appreciated. I have read quite a few threads and im still trouble shooting it. It seems like it doesnt crank over quite quick enough to pop it off. I have tried a new yuasa battery and a new Shorai lithium battery & have got it to start off of them here and there when they are newer. But seems like when the motor is warm or hot its harder to pop off. When I jump start it with another battery off a car it pops right off. The first thing i checked was spark and it was really weak and intermittent. I cleaned ALL electrical connections & used die electrical grease and made a new ground and have a iridium plug in it and that helped a bit & was night and day on spark because they have a bad ground setup factory. I also made sure the timing was perfect. I went through the carb & put a jd jet kit in it. The only other thing i can think of is the auto decompression on the exhaust cam. Can it slowly stop working & make it harder & harder to turn the motor over the more hours you have on it? Or is it more abrupt than that when it quits working? If its the decompression what is the part# for the new updated cam? Thanks in advance for all the help. I really appreciate it.