I thought the bike seems to take a kick or two more last weekend to start when she was hot so I decided to check the valves today for the first time as I am the second owner I do not know what they were at before. I do know this is the first time they have ever been checked and there is 47 hours on the meter that is true to the bike. Intake 0.05-0.05 Ex 0.09-0.12 As you can see they are too tight but I am unsure if this was tight enough to affect start up? Anyhow on Hondas we tend to run them tighter then OEM specs so my question to you guy is what do you set your valves at with these 2010-2010 yz450f? Should I aim tighter then specs or right on? Also do you think these valves are walking at this low of hours? I don’t see that it ever sucked in dirt or anything by checking the intake boot.