All you did was top end? No problems withclutch before? Then ya, plates may be stuck. Put the skid plate up on something , start it up in a higher gear then hit the brake hard to break plates loose. May take a couple tries. Make sure it is securely on stand and that IF it falls of it won't hit anything, YOU have to use your head on this operation.
Also be best to warm it up well before oil change so it flows out easier.
Also be best to warm it up well before oil change so it flows out easier.