Hi Dave, the next model up from the 423 and in the same range is the 523. IH sold the 523 here in the UK for a few years and we found them to be a very well built trouble free tractor. I have a 523 in the workshop im restoring for a customer at the moment. MJ
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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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