Spark is easy to check, take a spare plug, connect it up to the offending coil, hold it against the frame (wearing gloves is always smart) where the bolt part is (to ground it). and fire up the bike. See if you have spark, and what the color looks like.
Could be plugged pilot jets, so best to verify spark before pulling carbs or coils.
1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Rebuilt Forks w/ Progressive Springs
VN750.com Grill Cover
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R
1990 Kawasaki Vulcan 750
1998 Honda VFR800 FI
2014 Honda VFR800F
1989 Pontiac Firebird Formula 350