STIHL 064, 066 15
Condition Cause Remedy
Engine stalls at Idle jet bores or Clean jet bores and blow out
idle speed channels blocked with compressed air
Idle jet "too rich" Screw in low speed adjusting
screw slightly
(see carburetor adjustment)
Setting of idle speed adjusting Set idle speed adjusting screw
screw incorrect - throttle shutter correctly
completely closed
Small plastic plate in Clean or renew valve jet
valve jet does not close
Engine speed drops Air filter plugged Clean air filter
quickly under load
- low power Tank vent faulty Clean tank vent or replace if
necessary
Leak in fuel line between Seal or renew connections and
tank and fuel pump fuel line
Pump diaphragm damaged Fit new pump diaphragm
or fatigued
Main jet bores or Clean bores and channels
channels blocked
Fuel pickup body dirty Clean pickup body, fit new
filter
Fuel strainers dirty Clean fuel strainers
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