I have always used NGK plugs and plug caps since running a Suzuki TS50ER (restricted, but unrestricted to 42mph back in the day). An RD125DX, a GT250, a GSX750, a ZXR750H2 and a GSXR1000K3 followed… all on NGK. Even the current Husaberg TE300 runs NGKs. The Hilux and Landcruisers don’t count...