don't start the engine without reductor !!!!!
the clutch can explode !

in case you change the clutch springs, please verify this :
2005 type
model with 2 screws in each pad,
the heads of the screws on the internal side of the clutch (engine side) can touch the center hub and obstruct the free return of the pads
this can be the solution :
unscrew and cut (or file) the screw's head, one each, then reassemble each one in his hole
one more problem on new 2006 all steel clutch, sorry !
it is a spring problem, spring life is too short because the spring touch in the sock angle, when you change the sring you must hand mill the angle
noisy 2008 3 pads clutch
remove or cut this part