Hey JC, Gary here. have not posted in a long time, was lurking and just had to reply after seeing you reference the tree stump puller. Wow that was back in 2003 and the 116 was the biggest out there. I still have that bike (2001 serg) But I left one big chunk of the motor on the side of the road after 35,000 miles and 1,000 wheelies. It now has a Jim's 120 in it with 58mm TB and borzilla. Still fun to ride. Runs, loud, hot amd reak quick.
In 2007 I got the SEUC with the 110. Put in 10.5 HD pistons and Wood 9FG cam, 54mm TB with Fat Cat. Good usable power but started the dreaded head gasket leaks. I just sold the whole motor and ordered a new Jim's 131. I will install it stock next week and keep the 54mm TB and fat cat with quite baffle.
I must really be getting old, since the quite pipe and earlier torque of the 54mm TB are good enough for me these days. Of course with enough Cubic Inches it's all good, cool, fairly quiet, and still REALLY Quick. I will post numbers in a couple of weeks. I got the heads engraved: left: GAYR'S Right: CXXXI CI.
See ya on the road!
Gary