This is like having the Chiltons or Hayes manual, but for the 850 - 950 & 1050 along with several Yanmars like the YM2500, YM2610 and so on. This covers the 3T80, 3T90 & 3T90T engines. The ending T in the 30T90 just means turbo.
If anyone has one of these engines, you can turbo charge the engine. Look on the web for the turbo charged 3T80 in a YM2610 I believe. However, if you have the money, it\'s better to have the YM3810 or the YM4300 instead.