You’ll find useful resources on this page, tips, links to tools, parts and supplies required to complete your repair.
As an engine wears the critical tolerances between the rockers and valve tips usually increases and this causes a few problems. They include: hard starting; stiff pull cord; engine oil leaks; lack of power; erratic idle; noisy engine.
The gap (lash) between the rocker and valve tip is adjustable and this video covers that process step by step.
Tools & Parts
To nail this procedure you may need the following tools, parts and supplies.
Ratchet Tool Set
Before we can do anything, we'll need tools. I've selected this set as I own some Craftsman tools and while I have worn some out, they did do a lot of work. So I expect this set will last the occasional user quite a long time.
This set carries both metric and standard sockets and that's important, because some mowers will have both type of fastener sizes. Set includes spark plug sockets. Picture links to Amazon.com