Bike: 2006 Yamaha YFZ450. Bought the bike a few weeks ago, spun rod bearing after 2 hours, have 4 hours on the rebuild, seems pretty rich. Location: MN, 1000-1500 ft above sea level, somewhat humid, avg. 80* F, trail riding Mods: Fresh rebuild with WR450f crank & piston (12.5:1 - trying to run BP 93, but sometimes end up with random 91 non-oxy), cam mod (exhaust retarded one tooth), K&N filter with some sort of plain-jane aluminum intake pipe fitted between it and carb, no air box lid, stock pipe with spark arrestor removed. I ordered a bunch of OE jets (160-180 mains, 42-48 pilots, and a 35 leak to try in combo with the zip-tie/o-ring accelerator pump mod) and the NCVQ needle, so that I can dump the entire Dynojet kit the previous owner has in (using the Dynojet 165 main - ~ 180 in keihin terms). Looking for a starting point that's maybe just on the rich side so I can go from there. Thinking maybe 168 main, 45 pilot, 4th clip? But this is a random guess based on what I've been reading, since this is my first time jetting anything ever.