does anyone know where or if there is an oxygen sensor on the '03 600RR model or what does the function of the oxygen sensor...I'm stumped...or if anyone can give me some ideas on what is wrong with my bike I've invested almost $1000 in parts and still isn't fixed. I parked it over the winter, winterized it and everything and before I parked it it was running perfect and now it's getting crazy amounts of fuel like it's ridiculous...it literally took 3/4 tank of fuel to ride 18 miles...it shoots flames 3 foot out the exhaust and I just can't figure it out. I've put new injectors in it replaced the ecu new map sensor and disconnected the power commander just to be able to ride it even a little bit but, now I've been told to check the O2 sensor and cuz that can cause the excess fuel but I cannot find it...there is absolutely no electrical connections on the exhaust and it has to have one somewhere or something that serves the same function. The only aftermarket parts I have on the bike is the Power Commander but it's disconnected now, a Two Brothers slip on and a BMC air filter. If anyone could help me out it would be amazing...I'm at a lose. Thanks everyone!!

 

The 03's do not have a 02 sensor so that is not your problem. It sounds like you might have a bad FPR (Fuel pressure regulator). I'm not sure where Honda put them on the RR's, it might be part of the fuel pump. I would look in the service manual to see if you see where it is at. If you need a PDF of the service manual try this. Hope you get it back up and running