Deerhunter, I have a 1510 and I do not know if the numbers would be the same. Probably close but not exactly. However, I do want to welcome you to TBN and to assure you that you have come to a great place for information. You might have more success though, if you posted this in the Yanmar specific section. You posted in the "General Forums" and if you go further down the page of lists of forums you will come to the Yanmar forum. You can even search the forum with "torque" and it will list about 25 threads where that was discussed. I did not see a 1600 specifically, but a 1700 and 1500 were both there.