Hey guys I had just got a 1989 Honda cbr 600 and the left two cylindersDo not fire so I changed out my coil and my spark plugs and realized that I do have a spark but it’s very minor you cannot see it but only feel it with your fingers I don’t know where else to start from here I checked all the fuses and I’m down to basically wiring I am looking for help because I cannot figure out what is going on much appreciated

 

test coil first on other side then EARTH wires as its usually earth related with those symptoms try adding earth clamp to see if any difference direct from coil to battery and engine to battery then if no joy look for break in wire usually near the terminals carry out continuity test down wires end to end from ECU its best to have a manual to identify pins and coloured wires from, a simple multimeter set to OHM's ( usually have buzzer or sound ) when connecting two probes together is best way to check easily. Tricky to give more advice until you list whats been checked methodically. good luck AL.