Pretty bombproof workhorse.

6 years..... remove/recondition the injectors, while you're waiting,
fill the crankcase with "marvel mystery oil", inject a few
tablespoonfuls of MMO to the combustion chamber, spin the starter, let
sit for a few days/weeks. Will free up any stuck rings, etc.
Suck out the MMO from the combustion chambers, reinstall the injectors &
start the engine (have rag ready to stuff in the air intake in case of
'runaway') Bring to operating temp (at no load) to polish the cylinder
walls. Let soak a week. Rewarm, etc. Drain the crankcase .....
Should remove the carbon crap from the piston ring grooves, polish the
rust from the cyl. walls --- will probably have MORE compression than
when the engine was shut down 6 years ago.