Manual - Chapter 6 - Ignition

Specifications

Fuel Ignition system
Type Bosch VZ-51L or VZ-52L
Static ignition timing: US 75 models UK 75 models, 100 models
Crankshaft angle 4° BTDC 6° BTDC
Piston position 0,10 mm (0.0039 in) BTDC 0,24 mm (0.0095 in) BTDC
Advance starts at 1300 rpm
Advance range: US 75 models UK 75 models, 100 models
  26° 24°
Maximum advance at 8650 rpm
Retard starts at: 75 models 100 models
  8777 rpm 8650 rpm
Fuel injection shuts off at: 8905 rpm 8770 rpm
Starter motor lockout effective above 711 rpm
Cylinder identification Numbered consecutively front to rear, Number 1 cylinder at front (cam chain) end
Firing order: 75 models 100 models
  3 - 1 - 2 1 - 3 - 4 - 2
Direction of rotation Anticlockwise, looking at ignition trigger from front of machine
Recommended Ignition HT coil 75 models 100 models
Primary winding resistance 0,8 ohm N/Av
Secondary winding resistance 10 K ohm N/Av
Suppressor (HT lead connector) 1 K ohm or 0 ohm (marked) N/Av
Spark plug
Make Bosch
Type X5DC
Gap:
Standard 0,6 - 0,7 mm (0.024 - 0.028 in)
Service limit 0,8 mm (0.032 in)
Cap resistance 5 K ohm
Torque wrench settings 75 models 100 models
Component Nm lbf ft Nm lbf ft
Spark plugs 20 ± 2 15 ± 1,5 20 15
Ignition trigger backplate screws 3,5 ± 0,5 2,5 ± 0,5 3,6 2,5
Ignition trigger cover screws 6 ± 1 4,5 ± 0,5 N/Av N/Av
Ignition HT coil mounting bolts 6 ± 0,5 4,5 ± 0,5 N/Av N/Av

 

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