250ex Sportrax seized?

Hi all, new to the forum. I picked up an 07 250ex today and think I got a big time rip off. I was told it was last ran earlier this year and then sat outside not used since. It didn’t have a battery so I couldn’t check much but by the looks of it, it was well used. I hooked up a battery tonight and can hear and feel the starter engage, but doesnt turn over the motor. I bypassed the solenoid for the heck of it, and no difference. I then attempted to put it in gear to see if I could push the bike to see if the engine would turn over, thinking maybe I have a starter problem. In all gears the bike rolls easily as if its still in neutral. I’m not too familiar with this motor but shouldn’t it be engaged as I push it forward? Any suggestions? Thanks for any help