Join Date: May 2007
Location: Irvine, CA, USA
leaded fuel will destroy your cat almost immediately
as for the O2 sensor, it will help foul the sensor quicker, but it's not that much of an issue if you occasionally run some leaded race fuel.
BTW, the US uses AKI index for fuel ratings, which is (RON+MON)/2
105RON is approximately 98AKI. You should be able to find LL fuels (low lead) at the airport, and possibly purchase in fuel cans. Aviation fuels are also not subject to road taxes, so should be same if not cheaper.
If you'r elooking for higher octane numbers, you can also mix toluene or xylene which have a 144 and 117 AKI octane ratings and will mix fine with gas.
I mixes 101 octane and 91 in a 50/50 mix in my tank, effectively giving my bike 96AKI, and I noticed that she ran much smoother and the idle was great. however, my local pump sells
2006 K12R Aluminum - 6/2007~current
-ESA, ABS, heated grips, sport bags.
-PCIII w/ dyno tuned street map
-Leo Vince Ti silencer
-HID main light
-HID aux lights
-dual air filters