Did a search of the site and found this for firing order.
https://www.st-owners.com/forums/archive/index.php/t-40572.html
Found this too, at another site... just part of the wisdom there... about 1/2 way through might be the part you're looking for concerning just one cylinder. I bolded some stuff I thought relevant, and I always do the easiest stuff that it could be first. For instance, you're not parking under a rain gutter, or that cycinder getting the plug wire wet or something like that, or a bee or spider made a nest inside the spark plug wire, easy to arm chair troubleshoot! Good Luck!
IGNITION
No spark at all plugs (Faulty input system) If there is no spark at all plugs, the problem could be at the input of the ignition system
Possible system:
---pulse generator
---power input circuit of the spark unit
---neutral switch
---side stand switch---spark unit
---Check for loose or poorly connected spark unit connector.
---Check for loose or poorly connected ignition coil 3P mini connector.
---Check if battery voltage is measured between power input line (Black/White) and ground (Green) at the spark unit connector with the ignition switch ON and the engine stop switch at RUN
---Faulty ignition switch or engine stop switch
---Open circuit in wire harness
---Loose or poor contact of related circuit connectors
---Faulty bank angle sensor relay
---Faulty bank angle sensor
---Measure the pulse generator resistance at the spark unit connector
---Check the neutral switch for continuity at the spark unit connector
Alternator
---Open circuit between the unit and pulse generator
---Loose or poor contact of the pulse generator connector
---Check the neutral switch.
Faulty neutral switch
---Open circuit between the unit and neutral switch
---Loose or poor contact of the neutral switch connectors
---Faulty spark unit
Faulty side stand switch
---Open circuit between the unit and side stand switch
---Loose or poor contact of the side stand switch connector
No spark at either ignition group
---If there is no spark at either group, the problem is suspected in the primary coil side of the ignition system ignition coil, or unit and ignition coil circuit.
Switch the ignition coil primary terminal connection between the faulty pair and the good pair
Try spark test again, if "No Spark" condition: shifts to other pair
Measure resistance of the ignition primary coil at spark unit connector.
---Remove the faulty pair ignition coil and check pair.
---No Spark condition remains with faulty pair
---Faulty ignition coil
---
Faulty spark plug wire
---
Poor or loose contact of ignition coil SF mini connector
---Open circuit between the unit and ignition coil
---Faulty spark unit
---No spark at one plug (Trouble in secondary coil side)
---
Faulty spark plug is most likely.
Replace (suspected bad spark plug) with known good spark plug and conduct spark test.
---Original spark plug no good.
---Put the spark plug wire on and measure resistance of ignition secondary coil.
Remove the spark plug wire, and measure the resistance of the ignition secondary coil.---Conduct spark test on good ignition coil.
Faulty ignition coil
---Poor contact of spark plug wire
---F
aulty spark plug wire
Side stand switch does not function at all.
Side Stand Indicator:
---Check the side stand indicator for function.
Side Stand Switch:
---Check the side stand switch for continuity.
---Faulty side stand switch
---Open circuit in Green/White or Green wire
---Loose or poor contact of related connectors
---Open or short circuit in wire harness
---Burnt indicator bulb
---faulty side stand switch
