The big plug allows to act on the nut of the ignition wheel and the small plug goes on the top of the crankcase to read the inscriptions engraved on the wheel.
This allows for example to adjust the timing without having to completely remove the ignition cover.
Outside diameter of the big plug : 37mm
Outside diameter of the small cap: 20mm
Also compatible on the following models:
Honda 125cc, MSX Grom and HONDA Monkey 125cc injection
New Honda CUB 50cc or 110cc
Honda CBR125, CBR250R, CRF250
