Just bought a boat that has a Yamaha HPDI 175 on it. What kind of matinence do these motor require. I've heard Yamis like their additives. Thanks in advance.
- Change water seperator filter every year. - Change lower unit oil every two years. - If motor is surging at top speeds change all filters; especially the hard to get to one that is internal over the carbs.. - Pull the prop. often to check for line. - Put gas treatment in on each fill up. - Change the impeller every 3 years; and water pump every 6 years. - I am not a fan of Yamalube treatment and do not like any other additives.
I run both ring free and Yammie fuel stabilizer. Cheap insurance in my opinion. Mine has been trouble free for three years with 120 hours and is stingy on the oil. I only use Yamalube. I buy in but at the dealer for $22/gallon. At a 50:1 ratio that is over $125 in gas for every $22 in oil.