XC racing is very hard on a quad, so usually have issues after about ever race. Most are usually minor tho. Problems I have ran into so far this year are: Bent an upper a-arm in Round #1, In Round #2 I broke a clutch cable, finished off my rear brake pads, and finished off a tie-rod end that all have been replaced for Round #3. At the start of the season it isnt to bad because there is usually enough weeks between races to get things fixed between working. It gets a little busy during the summer when you have races every weekend. Mechanically as far as engine wise my quad is great since It was gone through over the winter. My shocks do seem to be getting a little softer so I think this winter they are gonna be sent off for a rework but they are due for it anyhow.