Measure the camshaft bearing seats and rocking
lever support pins with a bore meter
HEAD BEARINGS
Specification Desc./Quantity
bearing «A» Diameter 12.000 - 12.018 mm
bearing «B» Ø 20.000 ÷ 20.021 mm
bearing «C» Ø 37.000 - 37.025 mm
Measure the unloaded spring length
Characteristic
Standard length
40.2 mm
Allowable limit after use:
38.2 mm
- Clean the valve seats of any carbon residues.
- Using the Prussian blue, check the width of the
impression on the valve seat "V".
Characteristic
Standard value:
1 - 1.3 mm
Admissible limit:
1.6 mm
- If the impression width on the valve seat is larger than the prescribed limits, true the seats with a 45°
mill and then grind.
- In case of excessive wear or damage, replace the head.
STANDARD VALVE LENGTH
Specification
Desc./Quantity
Valve check Standard length Intake: 94.6 mm
Valve check Standard length Exhaust: 94.4 mm
Characteristics Beverly Tourer 300 i.e.
CHAR - 22
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