4 BT 45
3. Specifications
3.1 Fuel System Carburetor: Diaphragm carburetor
Carburetor leakage test
at gauge pressure: 0.8 bar (11.6 psi)
Checking operation of tank vent
at gauge pressure: 0.3 bar (4.4 psi)
under vacuum: 0.05 bar (0.725 psi)
Fuel: see instruction manual
Octane rating: min. 90 RON
Fuel mixture: Regular brand-name gasoline and
STIHL 50:1 two-stroke engine oil or
brand-name two-stroke engine oil
Mix ratio: 50:1 with STIHL two-stroke engine oil
Fuel mix for units with catalytic
converter: Use only STIHL 50:1 two-
stroke engine oil with lead-free
gasoline!
3.2 Gearbox Type: Multi-stage spur gear drive with
straight teeth
Gear ratios: 1 = 11.3:1
2 = 3.8:1
R = 12.7:1
Bearings: Deep-groove ball bearings
Lubrication: STIHL gear lubricant for brushcutters
(total capacity 20 g)
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