New original box output pinion for motorcycle 125cc Masai Black Rod from 2016 to 2018 and Dark Rod from 2015 to 2018.
It is essential that you you check the type of drive train you need before ordering. On small motorcycles, most 50cc use the 420 (6mm width, 12.7mm pitch) but some 50s and most 125s use the 428 (7mm width, 12.7mm pitch) even for 125 in 520 (6mm width, 15.8mm pitch). All drive train parts, i.e. front sprocket, chain and rear sprocket, absolutely must be of the same type.
To mount a chain with a split link you just need multigrip pliers and perhaps a flat screwdriver. If you need to shorten it you will need a chain splitter. To avoid that count the number of links needed to order the right length.
Compatibility models for guidance, it is advisable to disassemble the part to be replaced beforehand and check the correspondence with pictures and dimensions indicated on the site.