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The pushrod guide plate on my mower had the intake side plastic bit was a bit chewed up and probably contributed to the problem. Replaced the aluminum intake pushrod and the guide plate and all is good again. Thanks for the help.

Just received my new pushrods and pushrod guide plate (all B&S OEM) and wonder why they use the aluminum for the intake and steel for the exhaust since the intake tend to wear/break. Any ideas?

Owner of an Ariens lawn tractor with B&S 31R907-0018-G1 engine. Mower was acting like the valves needed adjustment and was going to check to see if the pin on the camshaft was in place. Tried to start prior and the engine spun freely so taking off the valve cover noted that rocker arm was...