reason I first said on side is,90 ser.is on side but 70 ser.is on top.90 ser. is easier to work on. For 970 take foot plate out,disconect lines,lingages,take 10 bolts out.Lift valve out and then take 4 plugs out,remove springs and pull out spools.put them back in same holes.spools have threaded hole in end to screw a screw in to pull them out.I use starting fluid to clean spools,bores.work on them till they slide in and out freely.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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