Spark Problems?

[Tvrner]

Bike has been stumbling a bit under throttle, especially in the mid range and I done the usual checkup and noticed I'm getting inconsistent spark on one of the cylinders but he plug looks good, what else could be the problem please
Help a brother, TIA

 

[Florynnn]

If the plug looks good but the spark is acting up, go tinker with the coil or plug wire next, maybe even swap them between cylinders to see if the issue moves. It could also be a ground or a weak connection somewhere in the ignition circuit.

 

[7orque&7hrottle]

Yeah, that's a smart move, flipping parts around is definitely the way to go. It could also just be a weak ground or connection

 

[BNL101]

Bike has been stumbling a bit under throttle, especially in the mid range and I done the usual checkup and noticed I'm getting inconsistent spark on one of the cylinders but he plug looks good, what else could be the problem please
Help a brother, TIA

I could think of a few but the coil pack would be my prime suspect because they can fail intermittently, causing weak or inconsistent spark, particularly under load. I agree with @Florynnn to try swapping the coil pack from a good cylinder to the problem one to see if the issue follows the coil. If that's not it, also check the plug cap and HT lead itself for any damage, corrosion, or internal resistance issues. Other things I'd inspect would be the wiring, connectors, fuel injector and even the ECU or ignition module!