25 mpg?

[Nicholas]

I got a 2003 busa, small airbox mod, full yoshi exhaust, powercommander, custom mapped, and a k&n air filteri recently just cleaned and re-oiled... and im only getting 25miles a gallon at most average is a bout 23-24 i can figure out why its so slow, even when i do just cruise slowly it gets no higher than 25

 

[BusaWhipped]

Assuming you've listed all the mods, it could be a few things.
1. PC map could be wrong.
2. coolant temp sensor could be failing
3. thermostat could be failing
4. air pressure sensor could be failing

 

[Nicholas]

i kinda think its the air pressure sensor, but ive had it mapped twice and even when i had the defaut map it wwas still the same how can i test the following that u listed?

 

[BusaWhipped]

If it was mapped with a bad sensor, the map will be bad because the stock ECU will be sending wong durations to the injectors. It may run ok for a little while, but failing sensors send inconsistent signals which may not adjust for changing contiotions so it will go out of tune again.

You should download the service manual for the testing procedures.

https://www.hayabusa.org/forum/maintenance-do-yourself/24284-permanent-shop-manual-hosting.html

 

[bandito]

Last August I bought an '05 with less than 3,000 miles on it, and it was getting about 25 mpg. Although I couldn't tell the performace was off, it was much improved after changing the plugs, and I average between 35-40 mpg now. Something to consider.

Good luck

 

[DevilDawg1]

That is some low mileage.

Does the bike smoke (black in color)?

How many miles on your plugs and a routine tune up?

 

[Nicholas]

ive changed my plugs about 3 times already. im running iridium plugs now and it doesnt smoke at all

 

[DevilDawg1]

Stick around here for awhile, the knowledge on this board for Busa's is remarkable.

 

[Nicholas]

yea, thats why i posted this, cause i have no idea, and maybe someone had this problem before

 

[BIG.C13]

Well i'm getting about 25 mpg on my 06 busa.. It has close to 20000 miles already.. I also took into consideration that i'm 6'3 290lbs.. And i was about 50lbs lighter when i bought the bike new...

 

[Nicholas]

well im 6,2 210 and i kno this dude that i was goin to school with that is around 300 and about 5,8 he getting about 40mpg

 

[Nicholas]

not sure what the issue was, but i had it tuned in orlando fl. and while i was in fl i was lucky if i could get 25mpg. but now that i moved back to atlanta ga. im getting about 33mpg

 

[Ape]

Make sure your tire pressure is correct. I lost 3-4 MPG when I forgot to check mine.

 

[GravityIsEvil]

i get 25-47mpg it all depends on the wind and how i ride it

 

[busa dave]

a good friend of mine just bought an 04 busa with 3,600 miles. he was getting 20.5 mpg or so. I synchronized the throttle bodies and changed the plugs. he now gets 32 riding pretty aggressively.