Jim
My 503 DCDI Operators Manual says 240 in-lb or 27 Nm on a cold engine
Rusty
Rotax 503 with Ducati Dual Ignition Spark Plugs (cold engine) using 13/16
" socket... torque to 27 Nm or 240 in lbs or 20 Ft. lbs they also
recommend using Anti-Seize on the plug threads. There is some question on
the use of Anti-Seize. Some people say if you change your plusgs every 20
hours the anti-seize is not necessary. Also the question has been raised
that the anti-seize insulates the plug from ground enough to cause weak
spark.