Yanmar 3YM Alternator V-Belt, Part Number 129612-42290E

Yanmar 2YM, 3YM20, 3YM30 Alternator V-Belt, Part Number 129612-42290E

This is the main V-drive belt on the 2YM15, 3YM20, and 3YM30 where fitted. 

For Yanmar diesel engines: 2YM, 3YM20, and 3YM30 using an Alternator V-Belt after June 2004 but before serial number E20847. After that, a flat belt listed below is used.

3YM30 before June 2004, use belt 119831-42290.

Newer model YM engines, after serial number E20848 require a flat serpentine belt, 128790-77580

Yanmar Part Number 129612-42290E (V-Belt after June 2004 but before serial number E20847)