The overhead camera — OHC — design of some Honda motors, a modification of the overhead valve — OHV — design, gives you a more streamlined and quieter engine. If your Honda lawnmower is running tough, and normal maintenance procedures such as cleaning the air filter and plug in or adjusting the carburetor do not help, you may have to adjust the valve clearance. This is not a difficult task, but to get the valve, then you have to remove the cover. It’s the chrome-plated one on the face of the engine using the letters “OHC” imprinted on it.
Pull the cable off the spark plug to prevent an accidental start while you’re operating on the mower engine.
Find the OHC cover on the face of the engine. If you do not see one, it’s likely in addition to the engine, under the engine shroud. For it, remove the shroud.
Unscrew the four or even six screws holding the shroud to the engine using a screwdriver or socket wrench. Lift the shroud from the engine to expose the OHC cover.
Unscrew the four bolts holding the OHC cover to the engine using a socket wrench.
Utilize a putty knife between the valve cover and the engine, and pry off the cover. If this is the first time you’re removing it, it may not come off readily. It can help to tap the putty knife with a hammer to force it behind the cover.