Have a baja 90 that will only crank with the back wheels raised off the ground, will not crank if wheels are on ground or if you hold the rear brake, it will just kind of lurch forward not cranking. until you pick it up. Any ideas out there.

 

Frozen up clutch perhaps?

 

+1

 

yep

 

any ideas how to free up

 

You get into the clutchs. Remove them and see what's wrong. Once in there, it'll prolly be obvious.