Primary transmission Z 16/51 - MBK Booster X 50i H2O 4T E3 ('07-'09) / Yamaha Aerox II 50i H2O 4T E3 ('14-'16) - Polini

Primary transmission Z 16/51 Polini for the following applications: MBK Booster X 50i H2O 4T E3 (2007-2009) / Nitro II 50i H2O 4T E3 (2014-2016) / Ovetto II 25km/h H2O 4T E3 (2012) / Ovetto II 50i H2O 4T E3 (2009-2016) / Ovetto II UBS 50i H2O 4T E3 (2012-2016) / Yamaha Aerox II 50i H2O 4T E3 (2014-2016) / Aerox II 50i H2O 4T E4 (2018) / Bw's 50i H2O 4T E3 (2014-2015) / Giggle 50i H2O 4T E3 (2007-2009) / Neo's II 25km/h H2O 4T E3 (2012-2014) / Neo's II 50i H2O 4T E3 (2009-2017) / Neo's II 50i H2O 4T E4 (2018) / Neo's II 50i USB H2O 4T E3 (2012-2017) / Neo's II 50i USB H2O 4T E4 (2018) / Neo's La Poste 50i H2O 4T E3 (2011-2015) / Vino 50i H2O 4T E3 (2006-2018) / Zuma F 50i H2O 4T E3 (2012-2016) / Zuma FX 50i H2O 4T E3 (2014-2018).

- To fit with cylinder set 166.0116;
- Number of teeth on sprockets: 16/51.