STIHL 064, 066 4
1.2 Fuel System 064 066
Carburetor: All position diaphragm All position diaphragm
carburetor with integral carburetor with integral
fuel pump fuel pump
Basic setting
High speed screw H: Back off approx. 1 turn Back off approx. 1 turn
Low speed screw L: Back off approx. 1 turn Back off approx. 1 turn
(starting with screws (starting with screws
tight against their tight against their
seats) seats)
Carburetor leakage test
at gauge pressure: 0.4 bar (5.8 psi) 0.4 bar (5.8 psi)
Fuel tank capacity: 0.84 I (1.77 US pt) 0.84 I (1.77 US pt)
Fuel mixture: Regular brand-name gasoline and brand-name two-stroke
engine oil
Mix ratio: 50:1 50:1
with STIHL two-stroke engine oil with STIHL two-stroke engine oil
25:1 25:1
with other brand-name two-stroke, with other brand-name two-stroke,
air-cooled engine oils air-cooled engine oils
Compensator: Keeps pressures equal at clean
air side of filter and metering
diaphragm irrespective of how dirty
the filter is
Air filter: Standard (wire mesh) Standard (wire mesh)
element element
Special accessory: Special accessory:
Heavy duty (HD)-air filter Heavy duty (HD)-air filter
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