There is an inline oil filter before the oil tank on the motor. also two comming off the compressor. At least my motor has them,not sure about the xs. My motor also has an air filter for the compressor. How old are the plugs? Everything else has already been mentioned.

OOOps. I didn't get the message until now Spare, I will call you when I think your outta bed. LOL.

I have a Coors Light available Hedge, but not before coffee.

Capt. Pete, I got the filters, three in all. Plus the long one that goes in the exhaust adapter for the water feed to compressor.
The XS did away with the air filter, the 225 had one.
Plugs, I had a set of old stock new on the shelf for the 225, I hope the plugs are the same, they were pricey 10 years ago. I just checked and they are not the same..

My Mercman said if I was paying them for a powerhead service it would run $350 with parts, due to the somewhat difficult access to the little parts and the pricey t-stats..

The platinum plugs originally used for the Optimax were very expensive. Now they use an iridium plug that is cheaper and back fits all Opti's.

this!!!!!

There's some good news for the Opti!!...Nick had a pair of 200s on Phat Kat...probably had 2,000 hrs on 'em by time he died...gobbs of power across the curve and fuel economy w/out equal...2 hrs to Gulf Stream, troll all day and 2 hrs back at 26 kts...on 90 gals fuel...nobody could match that back then...:beer:

I will post up some pics tomorrow, no problem on the 1/2 service. (filters and fuel system check complete. I will put-off t-stats, plugs, and poppet valve for another day. I did open the VST and take a look inside. Very clean. Nothing detected on the screen at the bottom of the fuel pump, zero debris, zero water.
Shift linkage at the motor needed a little shot of grease, along with the belt tensioner, tilt tube, swivel and latch mechanism. (4 zerks in all) Plus about a half dozen more places to dab a little grease.
So after a couple hours of messing with it, I put it all together and tested on the hose. Found two water leaks under the cowl. One was the water tube for the water pressure gauge, a real gusher and the other a dripping plastic fitting off the top of the block. Both would make a real mess if left unattended.
Went and used the boat.. It runs great. The entire family had a great time and will do it again soon..

water pressure hoses and senders are for fresh water people, not worth the risk in salt water. BTW, those water pressure sensors fail with great regularity, you may want to keep a spare on hand, or a resistor to fool the ecm into thinking you have presure

Not even hooked up to my knowledge. I will need to look into that one. Perhaps a different sensor than the one I am thinking of.

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it should have a water pressure sensor, look for a three wire sensor hooked to a piece of that spaghetti hose. There will be one for the pitot(speed) and one for water pressure.