Home Forums TaG Rotax Max RPM Not Reading above 11,000, Weak Spark? Reply To: RPM Not Reading above 11,000, Weak Spark?

tony zambos


IMO, in this one instance, the manual is incorrect when it comes to a Rotax.  Even two wraps of the rpm lead around the spark wire may not be sufficient.  I have three.  The rpm lead is only measuring flux changes as the coil discharges.  Don’t quote me on this, but the Rotax coil wire may have better insulation, hence a weaker signal to detect.  If your engine is stumbling at high rpm’s, you might have a marginal coil, but doesn’t seem to be the case.

There must be other Rotax guys out there running a MyChron on the Forum.  It would be nice to here from you on how you have the sensor attached.


LAD Specialties customer / tony kart / rotax / kt100