hi all, just a question about my clutch for my 04 xr400. when i put it in first gear and pull the clutch in the back tire spins, which obviously the clutch isnt disengaging. any tips or advice on what could be causing this.. i sort of have an idea but would just like to pick some brains. also i have just started doing some small jumps, is there anything i should be regularly maintaining or checking, before and after.. is there any likely damage it could possibly cause? these questions might seem silly, as i am not entirely mechanical so forgive me.