Over the past 5 months i have noticed my mpg going WAY down. 45 to about 35ish. The only thing i have changed since getting the bike is a two brothers exhaust, that shouldnt really be the changer. I have been thinking and talking to other mechanics, they say the O2 senser may have gone bad from changing it, and a bad O2 senser could cause mpg problems. Just wondering if anyone else has heard this. I thought about changing my fuel stabilizer. Just a thought.

For the new stuff, the two bros pipe and also new chain and sprockets. Vortex sprockets 16/46 and a DID chain. Well, sprockets and chain are on the way.

If anyone knows anything about my problem let me know ASAP.

I have an 06 f4i.

 

Change the sparks and fuel regulator, not to hard. The spark plug numbers are imr9c-9h and are made by ngk and the fuel reg can be found online or at your local dealership

 

well when i bought the bike i had them changed at my parents shop....bought the bike from our shop, picked it out at the auction myself. Ive had it a yr, should spark plug be bad already?

 

With cooler temperatures your going to notice a significant warm up time on your bike. This will throw it through a "warm up" cycle that will en-richen the fuel mixture. Causing gas mileage to drop significantly.

 

That's interesting, but I'm in NC. Its been doing it before it got cold. I can check the spark plugs but doubt that's the problem.

 

id say fuel pressure regulator

 

Im in NC too, Washington to be exact. But it sounds like the fpr if the milage is bad. is it stuttering or running rich?

 

Only thing that has changed is the mpg. It has back fired slightly but only a few times, prolly because of the pipe. Ive had pipe for about a year as well and its only backfired maybe 2x, but it does make a bubbly sound when i let off.

 

Hey guys my bike has been getting about 32smiles per gallon. I am on the gas pretty hard but 32 does seem low. I noticed my bike chugs sometimes. Could that be the FPR? How much should a dealer cost to change it?

 

^^^^ should answer your question gump...


as for cost cant help ya there