Alrighty... I started noticing the knocking noise about a month ago when I would just start it up. Some people were telling me that I needed to re adjust my valves prolly. Wasn't able to get out and ride very much until today I went riding for about 5 hours and continued to hear the noise. I started to realize that the knocking noise is only present when the clutch is NOT pulled in. No matter what gear I'm riding in you can hear the noise all up until I pull in the clutch. What would be causing it to make this noise when the clutch is released compared to not making the noise pulled in going through the gears...? I also noticed that my quad starts a lot easier even when in neutral when I have the clutch pulled in. I'm confused. Help please!