(3) See that spark control adjustment is correct (par. [88]).
(4) Drain and flush carburetor bowl (par. [73]).
(5) Drain and flush fuel strainer (par. [72]).
(6) Inspect air cleaner to see that passage of air through cleaner is not restricted by oil level being too high in oil cup, or by an excessive accumulation of dirt in filter elements (par. [76]).
(7) Check manifold packing nuts and carburetor mounting screws for tightness.
(8) See that spark plugs are clean and that gaps are adjusted between 0.025 inch to 0.030 inch. If condition of spark plugs is questionable, install new ones.
(9) Check adjustment of valve tappets (par. [43]).
(10) Check compression of both cylinders (par. [29 b].) (1)
(11) Check condition and adjustment of circuit breaker points (par. [84]).