OutdoorKing Repair Forum Forums Repairs and Maintenance Questions On Ride On Mowers Questions On Ride On Mowers Frames John Deere

The tappet adjustment is sometimes called the valve clearance or valve lash adjustment.

I think, but am not certain, that the single and twin cylinder OHV engines have the same internal design, which may or may not include a decompressor.

It isn't very likely that the tappet adjustment will be implicated if there is no decompressor.