A little issue

Ok so my z750 has been sitting in my garage on a rear stand for about 2 months or so, after putting my rear wheel on, adjusting chain etc, I was playing around pushing the clutch in and noticed my rear wheel whilst in 1st wont move with clutch fully in.

I can move it but it takes alot of force, could this be because the gearbox hasnt had oil running through it? as it would whilst the bike was running? I cant try starting the bike as my tank isnt on as its at work.

Any other thoughts? I was thinking tight chain, but its been adjusting with 30mm or so play in it. Im lost atm.

Perfectly normal. Once you get the bike going, you'll find the same thing happens even overnight. When cold, my clutch sticks enough to stall the engine from 2000 RPM when I stick it in first.
It makes push starting a cold bike more difficult too, but you should find that once you get a few turns of rotation (if it isn't too hard) between the clutch plates, it loosens up.

Perfectly normal. Once you get the bike going, you'll find the same thing happens even overnight. When cold, my clutch sticks enough to stall the engine from 2000 RPM when I stick it in first.
It makes push starting a cold bike more difficult too, but you should find that once you get a few turns of rotation (if it isn't too hard) between the clutch plates, it loosens up.

Spot on, bike runs a wet clutch - when it's dry it ain't lubed like it should be. A few turns of the gearbox will be enough to sort it out.

Ditto to above, on my old RX thou I used to put it in first, pull the clutch in and rock it before even trying to start it. Once I could push it backwards a bit, it was back into neutral, start and then go.
If I didnt it would always give a lurch when it clunked into first. IF it is REALLY bad it CAN indicate that the basket is notched and the plates are getting "assistance" to stick.
If you are worried push it up a slight rise (to make it easy) put it in first, pull the clutch in and roll it backwards (that seems to work better than forwards for me). It will free up pretty easy.

Phew, thanks guys, I was getting a lil worried but I thought it could only be something simple as it rode fine after the crash.