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Troubleshooting the Rotax line of two stroke ultralight aircraft engines.
Troubleshooting the Rotax line of two stroke ultralight aircraft engines.
UltralightNews.com
in stopping spark plug fowling. Look for a BP in its heading (NGK BP 8ES).
When removing or installing the spark plug cap make sure that the cap is turned, in the rotation
necessary to tighten the screw on cap on top of the spark plug, otherwise the improper removal of
the cap results in the backing off of the screw on cap and the possible loss of spark to the engine,
when the spark plug cap falls off.
WE DO NOT RECOMMEND THE USE OF SPARK PLUGS WITH THE SCREW ON CAP! USE THE SOLID CORE
SPARK PLUGS! ALSO THE SPARK PLUGS USED IN THE AUTOMOBILE INDUSTRY ARE SET UP WITH A
LARGER SPARK PLUG GAP THAN THOSE USED IN THE ULTRALIGHT / MOTORCYCLE / SNOWMOBILE
INDUSTRY! If you have to bend your spark plug electrode down alot to make the proper gap you
are using the wrong spark plug!
The recommended gap on the spark plugs is .015 of an inch. These plugs are capable of running for over 20 hours trouble free on a
points and condenser engine and up to 50 hours trouble free on a dual CDI ignition engine (if proper fuel and oil are used and the
engine is in proper tune).
They should be checked on a regular basis however, and replaced at the first sign of a miss or after
severe flooding of the engine.
If using a cylinder head temp gauge, removal of the ring on the bottom of the spark plug is
recommended, since the gauge sending unit replaces it.
Troubleshooting the Rotax line of two stroke ultralight
aircraft engines.
Spark Plugs used on Rotax ultralight aircraft engines:
The proper spark plug for use in most of the Rotax engines is the NGK BR8ES.
(Champion spark plugs are not recommended, nor are they factory authorized
for ultralight use.)
If using a spark plug with an BR/B in its heading, (usually used for ignition
noise suppression) such as NGK BR8ES, a resistor cap should not be used on
Rotax engines with a points ignition system.
This is because of the double resistance supplied when using both a
resistor plug and resistor cap.
It is suggested that engines running in the inverted engine installation use a spark plug with an extended electrode. This aids
