When the exhaust valve is operated by the tappet rod and rocker arm the intake valve is also carried down with it.
As the tappet is struck 400 to 600 times per minute, the wear and stress is great.
Each stamp has a tappet at the back, which requires to be daubed with grease on the lower side that it can be raised more easily.
In these grooves slides a tappet, n, connected with the axle.
After going over my engine, I found that a tappet rod had broken and stripped the cowling.
By an ingenious rocker arm and tappet rod arrangement it is possible to operate both valves with a single push rod.
The resistance and pressure of the tappet tends to throw increased and unequal wear on the opposite side of the cylinder.