Once the primary and secondary are within the specifications any coil with 2 secondary coil leads will do.
I think you are referring to the newer[size=1em]"coil over plug" ignition coil[/size] or "stick coils" as they are commonly called. These are not suitable for the Fazer for different reasons.
The most likely issue is water ingress and/or corrosion within the leads/caps. Unfortunately NGK caps are not easily dismantled to clean like the OEM ones.
Best preventative method is use some Dielectric grease on the lead plus the inside of the top boot and the ceramic section of the plug. Also try not to park the bike on the side stand in heavy rain, water pools around number 3 Plug/cap
I still run with OEM caps (after 87000 miles on a bike used everyday in all weather) which have been cleaned and used the internal resistor of the NGK caps as it is stainless compare to the OEM (Cheap and problematic) carbon ones.
Finally check the Coils and ensure all connection are clean a fitting properly
I think you are referring to the newer[size=1em]"coil over plug" ignition coil[/size] or "stick coils" as they are commonly called. These are not suitable for the Fazer for different reasons.
The most likely issue is water ingress and/or corrosion within the leads/caps. Unfortunately NGK caps are not easily dismantled to clean like the OEM ones.
Best preventative method is use some Dielectric grease on the lead plus the inside of the top boot and the ceramic section of the plug. Also try not to park the bike on the side stand in heavy rain, water pools around number 3 Plug/cap
I still run with OEM caps (after 87000 miles on a bike used everyday in all weather) which have been cleaned and used the internal resistor of the NGK caps as it is stainless compare to the OEM (Cheap and problematic) carbon ones.
Finally check the Coils and ensure all connection are clean a fitting properly