Have not used my bike for a good 6 Months. Had an oil leak which I have managed to get round to looking at. Re-assembled my bike today and thought I would take it for some fuel. Started up okay. As soon as I engaged first gear, the bike stalled. Side stand was up, and whilst the bike was off the road, it was on its centre stand. I did try to push the bike whilst in gear but with the clutch lever pulled back, and it felt as though the clutch wasn't working. Wasn't able to free wheel the bike? Whilst bike was off the road, I have changed the plugs, air filter, new oil filter and oil which I changed today? Any suggestions/help would be very much appreciated. Bike is a 2002 Suzuki GSX 750 F