By: Author John Cunningham. Published: 2020/10/14 at 9:47 am
As an engine wears, the critical tolerances between the rockers and valve tips usually increase, and this causes a few problems. They include hard starting, stiff pull cord, engine oil leaks, lack of power, erratic idle, and noisy engine.
The gap (lash) between the rocker and valve tip is adjustable, and this video covers that process step by step.
Before working on your mower, be sure to remove the plug wire to prevent accidental starting; see “Repair Safety Video.”
Valve lash specs are different for all makes and models, and on some engines, the intake and exhaust lash measurements will differ, check your spec here:
You may find the following post helpful – How ignition systems work?
Need more info on the fuel system, carburetor components, and how they work, you can check them out here.
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John Cunningham is a Red Seal Certified Tech with 25+ years of wrenching.
Bringing hands-on expertise to LawnmowerFixed.com, John writes practical repair and lawn care guides with a passion for keeping outdoor equipment running smoothly.