The origination engines were very robust and reliable. But over time, reducing their potential, many owners have replaced with new generation engines. We publish here the instructions Yanmar 2YM15 series, 3YM20 3YM30 and, for those who have lost. Hoping it will serve you well.
The file is a little heavy, you can get by downloading here: YANMAR Manuel 2YM15 3YM20 3YM30.pdf