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Do you have to pull engine replace PCV valve on your John Deere 425 with Kawasaki 20 hp engine?

No, you do not have to pull the engine to replace the PCV valve on a John Deere 425 with a Kawasaki 20 hp engine. The PCV valve is located on the top of the engine, near the front. You can reach it by removing the air filter cover and the air filter.