Before you try and start the motor make sure that the clutch will disengage. If that machine has been sitting for that long its a good chance that the clutch facings may be stuck to the fly wheel. If this is the case the machine will leap forward if the motor starts and do great harm to person & property.
If the motor is good & free and turns over try and give it a pull to start. Nice long chain and be carefull not to hit the vehicle pulling you. By pulling to start will allow the motor to turn over faster improving compression and and get all engine componets working in harmony.
