I have an 08 SEUC3 and keep(kept) reading about the issues with the 110 motor. After 5 years I wanted to make some changes to my ride. My mileage was 17,000 when I started the build. Nothing newer struck my fancy, so I made some upgrades to my ride. One that I am big on is a gear drive cam. I had the heads ported and polished, throttle body ported, 575 cams with new Chevy style progressive springs, adj. push rods, (probably should of had the crank welded but did not) new LED headlight and driving lights, lumbar backrest, new tour pack latches, and some other nick nacks. But most engine upgrades are listed. It was my winter build. Put one thousand miles on the build and filled the motor with Amsoil. Good to go. It was a 120/120 build.
Ended with 118 HP/128 Torq. Very happy with the results. I already have the SERT. It is a very dependable build that others have done. And I can say my mileage is the same. I may have lost 1 MPG but I think it is my more my righthand. The build was done by Harley for what little warranty I have, and the mechanic is very good and will tell you "you need this or Don't waste your money" He said since I do not live at 5,000 RPM the crank will be just fine. Keep in mind this is not a radical build. More of a "Let's make it better build".
I guess what I'm trying to say is port and polish the heads, Port the throttle body, and new cams, gear drive, and push rods(adj.), New valve springs(that includes new bearing) but more importantly gets rid of the 180 lb. monsters that seem to be causing failures. Oil pump was not an issue for me but many will say oil pump too. One thing I did investigate was the oil filter. I went with KandP Engineering. Also one added item I will add when my new Commander IIs wear out is a new Baker +1 oil pan. These engines are oil and air cooled and 1 more quart of oil is huge.
Just some of my thoughts
Doug