Stihl MS 250 - Fuel System; Ignition System; Chain Lubrication

5MS 210, MS 230, MS 250
3.2 Fuel System
Carburetor leakage test
at gauge pressure: 0.8 bar (11.6 psi)
Function of tank vent
at gauge pressure: 0.3 bar (4.35 psi)
0.05 bar (0.72 psi)
Fuel: see owner’s manual
3.3 Ignition System
Air gap between ignition module
and fanwheel: 0.2 – 0.4 mm (0.008 – 0.015 in)
Spark plug (resistor type): Bosch WSR 6F
NGK BPMR 7A
Electrode gap: 0.5 mm (0.02 in)
3.4 Chain Lubrication
Fully automatic speed-controlled oil pump with rotary piston
Oil delivery rate: approx. 7.5 cc/min (0.46 cu in/min) at 10,000 rpm