I have my '05 torn down for a 24-k (48k total miles) and have noticed a significant fuel leak at injector #1. The other 3 look dry. Now, the bike has not been running great past couple years and gas mileage has been down too, around 32 mpg. Neither an O-sensor replacement nor a battery change improved matters. So, my question to the group is: Should I replace the fuel injectors with the refurbs from Beemerboneyard ($125) or just replace the O-rings? I already have new plugs and wires ready to go in.