Wanted to get some ideas on why my bike has these "Spots O Spooge" (SOS) on the fender, myself (don't ask), the muffler, and anywhere around the back end of the bike. 2002 with fresh OEM piston/rings, well jetted, plenty of power, starts first kick hot/cold, etc. One thing after riding with USMC500 I decided that I would cut off the tip off the FMF as I liked the look. I then decided I really didn't like being "tipless" (no offense Oscar) but did not like the stock FMF "droop" so had a straight tip put on. I don't think this is causing the "spots o spooge" but the exhaust is exiting straight out instead of down.
Jetting is 168/stock 3rd clip/55 and I have tried lots of different combos. Stock carb with stock reeds. I have run the ratio from 40:1 to 80:1. Less SOS at 80 but still there. I run 10oz of TORCO octane boost with 91 octane CA gas for 5 gallons. 40:1 feels fat, 80:1 feels best. I usually end up at 70:1. Been in the motor a few times while experimenting with the bike and getting used to the 500. No carbon, everything is nice and wet, looks great. Plug is always black, maybe a little wet, and never fouls. I always run my 500 a little rich here in the desert. Have 45 hours of engine time. Seems like it started 10-15 hours ago? Do I just weld a 45 deg on the tip and not worry about it or is something up? Is this normal? No change in the power at all, bike has always run very well.