All I can say is Jonathan Snyder ( JOHN ) who I think works in the warehouse is the man to talk to ! a few years ago I bought two 18 HP Briggs & Stratton two cylinder replacement engine for my John Deere 316 tractors Last week while cutting are 2 and 1/2 acres of grass I heard the engin change it sound ! Just as I finshed she stop cooled ! I opened the OHV covers and in the right side one found a broken push rod John got me the right rod But took me throuugh how and were to replace and calibrate the push rod both the exhaust and the intake. Thank you Mr.Snyder I could of never done it without you !