ok so i went to the track today on a fresh oil\filter change and about 3 hours of riding i heard this really bad clicking noise i never heard before. and right when i got out of the trail i killed it by accident and it wouldnt start up again... so we ahd to cut the day short because our other yz250f wasnt working either.... I havnt checked the plug yet, but why would the plug cause a ticking noise. im 95% sure it was coming from the engine. Ill try starting it again tomarrow. Ive changed oil before and its pretty simple so idk how it could screw up the bike.