Catalytic Converter. STIHL BR380

English / USA

Catalytic Converter* Checking the Spark Plug

Units with a catalytic converter* may only be operated with unleaded gasoline and STIHL two cycle engine oil or equivalent quality two cycle engine oils in a mix ratio of 50:1 (see chapter

“Fuel”).

The catalylic converter in the muffler reduces noxious emissions in the exhaust gas.

Correct adjustment of the carburetor (if adjustable) and observance of the specified mix ratio of gasoline and two cycle engine oil are essential to minimize harmful exhaust emissions and ensure a long catalyst service life.

Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation.

If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug.

: Remove spark plug – see "Starting /

Stopping the Engine".

: Clean dirty spark plug.

: Check electrode gap (A) and readjust if necessary – see

"Specifications".

: Use only resistor type spark plugs of the approved range.

Rectify problems which have caused fouling of spark plug:

: Too much oil in fuel mix.

: Dirty air filter.

: Unfavorable running conditions, e.g. operating at part load.

Fit a new spark plug after approx.

100 operating hours or earlier if the electrodes are badly eroded.

* see “Guide to Using this Manual”

BR 380 21