I have motors that are over 20 years old and they work just fine.
First, remove the igniter from the motor. Is it burned? If not, you have a bad
connection or weak batteries.
If yes, the pyrogen was probably not touching the propellant grain. The pyrogen
MUST be in contact with the propellant. If the motor has misfired before, there
may be carbon deposited on the end of the propellant grain preventing the
pyrogen from making contact. To clean the carbon off use a small, sharp drill
bit that just fits the nozzle (I keep a 1/8" bit in my range box). Turn the bit
by hand, NOT in a drill.
Hope this helps.
Clear skies and straight smoke.
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