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correct position between sensor and trigger nose is important for operation of external sensor triggered systems

click picture to enlarge

As a result of all sorts of things (notable such as crankshaft modifications) it may happen that the rotor sits higher or lower than conceived. In the case of external trigger systems it may mean loss of spark.

Make sure that sensor (the metal core in its middle) and trigger plate on rotor circumference are level.

Here in the picture to the left it would mean that you still might get spark, but at very high starting revs. 

More extreme situations as sketched below ("problem") will produce only 1 spark at start and than totally suppress sparks.


If the rotor sits too high, you may push the sensor up to the needed level by a spacer plate (we offer 2mm thick plates under part 700030000). A rotor sitting too low needs to be replaced, as it would destroy the coils under it.


Also very important for operation of such systems is correct gap.
0.4 is the standard. 

If gap is wider, starting will be more problematic, right up to impossible if you have values over 0.6-0.7mm

should the gap between sensor and trigger sign have been too small, leading to friction between the parts (you can see the effect often on polishing traces at the rotorīs trigger sign or in more extreme cases deep scratches there as shown here) than the sensor may have been internally damaged even if its electrical resistance  is correct. 

Inside the sensor is a heat sensitive neodym magnet that looses magnetism if heated above a certain temperature (often reached by friction). The result is bad starting or outright ignition failure. The sensor has to be replaced.


Should the sensor (getting loose) have interfered with the trigger plate than you have a destroyed sensor. Picture left shows some extreme case. But there are cases where you see nothing much, but still, the plastic mould may have been dislocated a bit and the very thin wire inside broke. Electrical resistance than is indefinite.

Such events also manifest on the trigger plate, damaging the trigger plateīs edge.

Should you find such damage, imperatively take the flywheel off and inspect its magnets and the stator coil. Very often the shock of impact between sensor and rotor produces damage there. 
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