Valve leakage test

For reassembly, reverse the procedure followed for disassembly except where otherwise stated.

VALVE LEAKAGE TEST

• Insert the spark plugs in their seats.

1. Pour some petrol into one of the combustion chambers so that it just covers the valve heads.
2. Blow low-pressure air into the intake and exhaust ports and check that no bubbles form in the petrol; if there are bubbles, check for correct assembly and grind the valve seats again if necessary.

Correct Positioning of the Rocker Arm Shaft

• After reassembling the washers, rocker arms and springs, rotate the shaft to align notches "A" with the holes "B" in order to permit their passage of the cylinder head support studs. Use pin "C" (diam. 12mm) to ensure correct alignment.