Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 124Get this manual

Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 124

POWER UNIT MEASURING THE COMPRESSION PRESSURE NOTE:
Before measuring the compression pressure, warm-up the engineCorrect measurement cannot be obtained when the engine is coldMeasure: Compression pressure Below minimum compression pressure Check the valve clearance, valve face, valve seat, piston rings, cylinder sleeve, piston, cylinder head gasket and cylinder headCompression pressure (Reference value): 950 kPa (9.5 kgfcm2135.1 psi) Measuring steps: (1)Checking the valve clearanceRefer to "ADJUSTING THE VALVE CLEARANCE" on page 3-15(2)Remove the spark plugs 1
CAUTION:

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