My 2006 Yamaha T 9.9 has a ton of hours on it and instead of waiting for it to wear out completely I thought its time to give it an overhaul. I found water in the gearcase this fall so in November I bought all the parts I needed to have it rebuilt and included a new prop shaft and spray welding the driveshaft to eliminate a wear grove. (caused by the oil seal rubbing over those thousands of hours use) I pulled the powerhead yesterday and switched over all the bolt on parts to a low hour spare powerhead that I found in November. I had to take the oil pan out as well to get to the water pick up tube to replace with a new one. When ever I have the powerhead off I replace the rubber upper pan grommets which eliminate metal on metal rattles. They wear out after a few years of steady use and a rattle can begin at certain rpms. Now that what is left on the boat weighs very little I'm going to remove the rest from the boat and have the power tilt gone through and a known couple of parts that fail replaced. Once that comes back the low hour powerhead will be bolted into place and a few hours of hooking everything back up I should have a good to go kicker for many more years.