ENGINE AND PERIPHERALS
Specifications
10
10-21
Bare prechamber
Half-prechamber
Valves
See the "Overhauling the engine" section for how to
redress the valve seats.
92448-1S
Stem diameter (in mm)
Inlet: 7.991
+ 0
- 0.02
Exhaust: 7.978
+ 0
- 0.02
Setting angle
90˚
Head diameter (in mm)
Inlet:
Exhaust:
40.32 ± 0.12
33.32 ± 0.12
Maximum valve lift (in mm)
Inlet:
Exhaust:
Valve set back in relation to the
cylinder head mating surface
(in mm)
9.27
8.80
0.80 to 1.15
Valve clearance settings (in mm)
Inlet:
Exhaust:
0.20 ± 0.02
0.25 ± 0.02
Valve seats
Seat angles (
α
)
Inlet and exhaust: 90˚
Mating surface width X (in mm)
Inlet and exhaust: 1.75 ± 0.2
External diameter D (in mm)
Inlet: 42
+ 0.13
+ 0.11
Exhaust: 34.6
+ 0.03
+ 0.01
73928R
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