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Zero compression could be a lot of things, All major.
Piston or ring problem, intake or exhaust valve not seating or burnt.Or problem with valves not opening at all.And so on. You need to have it checked by a good shop you trust.
make sure engine is warmed up. Put cylinder one at top dead center,remove the valve cover,loosen all adjustment lock nuts,adust intake and exhaust valves on cyl #1 and intake valve on #2 and exhaust valve on #3. now rotate crankshaft 360 degrees clockwise, now adjust intake valves on cyl#3 and cyl #4 and exhaust valves on cyl #2 and cyl #4.now tighten lock nuts and install valve cover. specs are intake valves 25mm clearance and exhaust 28mm clearance, use a feeler gauge,heres a picture to show you where to check clearance.
Follow the large radiator inlet hose from the radiator, to the thermostat housing. Once the housing is located, simply remove the housing to expose the thermostat. It may be necessary to remove the air cleaner and duct assembly, and the crossover exhaust pipe, as well.
Typically. there is a build up in the exhaust cross over port that is centered front to back and passes directly under the choke and carb. Be sure the valve at the end of the right (usually) exhaust manifold, is free and working.
The EGR valve is subject to problems from exhaust particles, that sometimes jamb it open.