Okay guys so I have an 04 cbr600rr with 18k Miles. I don't pay attention to my fuel gauge since the float is stuck (long story, short, even after readjusting it, it would remain stuck). So it only reads for 4 bars and up, below that and it won't read.
I've only gone 75 miles since the last full tank and i'm a bit more then 3/4s down the tank. so I'm left with around 25% gas or less. I do regular commuting below 5k RPM. Before this occured luckily I checked how many miles I could go before the bike died, and it went 180 miles.
What can cause bad Gas mileage?
: I'm sure they haven't been changed, i'm waiting on my wrench plug to come in so i could change it next week.
: Still has stock air filter... I'm assuming its never been changed, I put it against the light and couldn't see anything through it.
Recent modifications/ changes
: Jardine RT-One exhaust. It used to have a custom exhaust but it was basically straight pipe (literally).
Oil Change a few miles ago.
Coolant changed months ago before I noticed bad gas mileage.
: I haven't seen any leaks, I've gone under the tank to see if there is any build up and couldn't find any.
: Completely clean, not rusted at all. (I did use at least 3 different gas companies before letting it die completely... If it's an issue...)
There is no smoke what's so ever at all.
WHAT COULD IT BE?
Air filter? Spark Plug? Faulty ECM? Faulty Pump? Dirty Injectors? Leaks?
I know those are causes, but could you guys help me pin point? Thanks!