Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 48Get this manual
12) Inspection of Compression Pressure 123Start and idle engine for minutes to warm up, and then stopShift gear into neutral (N)Remove lock plate (of stop switch lanyard) from stop switch
CAUTION
To prevent accidental start of the engine, remove lock plate (of stop switch lanyard) from stop switch before measuring compression pressureRemove plug cap and then spark plug
CAUTION
Clean areas around spark plug on the cylinder before removing spark plugs to prevent dirt from entering cylinder1