... first! the comments I made above refer to there being only an intermittent or no spark when the motor is turned over very slowly
Transistor boxes and there triggers have certain idiosyncrasies .
when powered up ... but in standby ,
the box may not fire ... when turned over too slowly .
.. the 2 rotor magnets must pass the pickup coils with a certain amount of angular velocity
to signal the box to start working .
it doesnt take much ... but it has to be enough .
you can take a refrigerator magnet , stuck on the end of a pencil
and wag it back and forth over the pickup ... and it will wake up and fire the plugs . .. just like the rotor does when its spinning.
a stationary magnet alone wont do it
and the magnets proximity to the pickup won't do it either .
its the added velocity of the magnetic field
that adds the extra bit that produces enough signal to wake the transistor box .
on the other hand ,
if the 2 free air sparks produced are not equal ,
like one spark is intermittent and one is good ... this is usually a coil , spark plug wire or spark plug problem ... not a transistor box problem.
if your coils must be wrapped in insulation to make them work ... they are on the edge of failure .
this is a new build , right ?
it sounds like maybe the bike is getting easier to start as its getting broken in .