I have a 80 650maxim that I bought last winter no gas tank,seat,carbs. the rest in parts in a bucket. just got to looking at it this week and discovered the engine is locked up, removed spark plugs and put in gear to move engine,no movement, is there a good way to get it to free up? or should I just find another one and use parts off of it? anyone here live in oklahoma who knows of another 650maxim for sale?