baobei

39 minutes ago, daboo said:

There's a couple things I spotted in your comments.

• Your mileage is in the city.
• The bike is wickedly quick.

City mileage will just tank  your mileage.  Sit in traffic, and your mileage will go down.  Stop for a light or stop sign, and your mileage will go down.

I had a Burgman 400 scooter with a average MPG display.  After a fill up, if I babied it, I'd be up in the 60's on the way home, especially after coasting down the hill to my house.  Of course, the next morning, I had to go back up that same hill.  On the way to the freeway, there were about 4 stop lights.  The MPG would go down to the low 50s and stay there for awhile.  It wasn't till I'd gone about 15 miles at constant freeway speeds that I would see the average MPG start inching up.  In other words, it took at least 15 miles of constant speed riding to make up for those few stop lights and the hill.  

How do you know the bike is wickedly quick?  Oh...I see...you've been twisting the right wrist a lot.    And you didn't think that made a difference?  I think you mentioned the engine cut out...as the front wheel lifted.  And you're surprised that your MPG isn't higher?     

Chris

I agree with your assessment. However, I'm puzzled by the following

• This fuelly page has 72 bikes that almost all get better mileage than mine.   Given how fast this bike is, I can't imagine that all 72 of those owners don't take advantage of the power this baby has now and then.

  Yamaha FJ-09 MPG - Actual MPG from 72 Yamaha FJ-09 owners

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  The most accurate Yamaha FJ-09 MPG estimates based on real world...
• I read a post where an owner was talking about mileage in the 40s somewhere and that he also had his ECU flashed to always start in A mode!  That also doesn't sound like someone who takes things easy when cruising around.

Skip,

I always fill to just above the metal plate.  Always on the side-stand though. 

I got my ECU out and I'm sending it to 2WDW.  Travis thinks a new flash will improve my mileage.  Since I have the bike apart, I also ordered a CarbTune Pro and I'm going to sync my throttle bodies.

I found some oil inside the airbox.  Here's a picture.  Is this normal or indicative of a problem?

18 hours ago, Cruizin said:

You want to be damn picky when choosing tuner. Our resident tuner @2wheeldynoworks has to fix alot of "other shops" tunes. Anyone can get the software and start making tunes, that's kinda scary. 

I think I remember that the shop said the tune was for a FZ-09 and that it should be good for my FJ-09. 

In light of what you said, that doesn't sound so good.

What's the best aftermarket tune out there these days?

20 hours ago, 1moreroad said:

Can't pull up a chart but looking at the numbers there is no pattern. You had a tank at 15 mpg followed by a tank at 50 mpg. That's weird and suggests an environmental problem not a bike problem. Do you always fuel up at the same station or is there a pattern where you fuel up? Maybe bad gas at a particular pump. How long does the bike sit between rides? There's no dates on your chart. 

Sort of half kidding, half not, you should do several multi-tank steady throttle rides (touring not SPORT touring) and see if the mileage settles down to a regular number. 1000 miles in a long weekend could be informative. 

I think the 15 and 50 issue was some dyslexia on my part putting the mileage in!

6 hours ago, 1moreroad said:

There was a former forum member (Lawrence of Arabia or something like that) who ran through entire tanks at B mode and noticed a drop in mileage compared to STD. 

How recent? About a month ago ALL of my vehicles' mileage dropped about 15%. At this time last year the same thing happened. Different gas stations, different brands. I'm assuming it was the switch to winter blend gas  

I was confused.  I run in standard mode all the time, not B mode.

Here's the spreadsheet with my mileage history:

FJ-09 Mileage Tracker - Google Sheets

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Sheet1 Odometer,Gallons,Miles,Mileage,Avg,Notes 3285,34.86,Avg...

15 hours ago, skipperT said:

Did you tell them you had a stock exhaust?

i wonder if perhaps they flashed your ECM with a tune meant for an aftermarket exhaust. It would explain the poor fuel mileage and carboned-up plugs. 
 

You need a scope to accurately test an o2 sensor. Do you smell “rotten eggs” ever while riding? If so, that also indicate that your catalytic converter is dealing with a too-rich condition, esp at part throttle / cruising speeds. 

The had the bike for the ECU flash, so I'm sure they knew about the stock exhaust.

No, can't say I've smelled rotten eggs.

I don't recall a "whine" noise, so that might be something!  Where could I look on bike to check this?

Still on stock exhaust.  How would you go about determining if O2 sensor is reading correctly?

This is what the flash covered, they said:

• • 1 to 1 throttle
  • Ignition
  • Engine braking
  • Injector shutoff
  • Idle
  • Fan activation
  • Fuel mapping

The bike seems to run well.  I've had it serviced at a couple of shops and no mechanic has ever commented on how it runs.

The bike is wicked quick.  It often intermittently drops out on hard acceleration as the front wheel comes off the ground and the traction control drops it again.

The mechanic who changed the plugs said I had too much carbon on them and I should frequently keep the bike over 6k RPM to "blow it out" in the future.

I have owned a 2015 FJ-09 for 3.5 years.  It has 9,533 miles on it.

My average mileage over this time is 34mpg.  More recently I've been getting 26-32mpg.

I've been jealous of other owners who get great mileage.  For example, the Fuelly chart shows mileage anywhere between 32mpg and 56mpg, with the average being around 44mpg.

http://www.fuelly.com/motorcycle/yamaha/fj-09/2015

I keep the bike in B mode most of the time.  I goose it from time-to-time but I'm not super crazy on it.  Most of my miles are in-town.  The bike is stock except for an ECU flash in 2017 (EDR Performance).  The average mileage before flash was 38mpg and after was 33mpg.

Just wondering if this poor milage is a symptom of something wrong with the bike.  For example, does this indicate that I need to syncronize my throttle bodies?  Or is this completely normal?

I've replace the spark plugs and air filter recently as well.  Didn't change mileage.