2008 FJR1300 Poor Gas Mileage - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 23 (permalink) Old 01-07-2021, 11:24 PM Thread Starter
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2008 FJR1300 Poor Gas Mileage

Part 1

Had the bike in the shop for a throttle body sync and new spark plugs.
After I picked it up and parked it in the garage, I smelt gas vapors on the left side of the bike where the vent and overflow hoses come out of the tank.
Took it back to the dealership and they checked the gas tank and everything attached to it. No leaks of any kind where detected.
I suspect that I had overfilled the gas tank a day or so before I dropped off the bike at the shop, and there was some gas trapped in the canister. The smell of gas eventually subsided, and within a couple of days it had disappeared completely.


Part 2
Over the last two fill-ups I noticed that the average gas mileage has decreased from 39.9 mpg to about 34.9- 35.7mpg. I am using 87 regular, Shell gas.
I am aware that living in California we get summer blend and winter blend, and because of that the mpg is supposed do drop some during the winter months.
Would that explain it, or do you guys think that may be something else causing this problem? The bike runs very strong, and it starts right away with no hesitation.
Tire pressure at 40psi front and 42psi rear.

Any input is appreciated!

Last edited by calboy; 01-08-2021 at 01:39 AM.
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post #2 of 23 (permalink) Old 01-08-2021, 04:01 AM
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I think youíre worrying over nothing. The slight difference between your avg mpg numbers is nothing to worry about. Maybe your riding style and conditions varied slightly.

FWIW, I only get about 28-30 mpg on average. But I use the twisty loud handle a lot!
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When I was a track-a-holic on my R1 & R6, I used to think that the FJR was an old man's bike. Then I got one and absolutely love it. Hey...wait a minute!
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post #3 of 23 (permalink) Old 01-08-2021, 08:12 AM
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I also have a 2008. A few years ago when I started getting noticeably bad mileage, I eventually traced it to a hole in a vacuum hose. The engine was running pretty rough at low idle as well.
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post #4 of 23 (permalink) Old 01-08-2021, 08:30 AM
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Your mileage may be a bit lower if the ambient weather is generally cooler these days. Also, if you use the bike's fuel mileage indicator, it is not as accurate as manual calculation based on actual fuel used/miles travelled. If you are doing shorter runs vs. longer trips, your mileage won't be as good. And some days you'll find you get better mileage in 4th rather than 5th (engine under load if cruising rpm is not high enough). But I don't see anything unusual..... track it over a year and see what the mileage is over many conditions.
OR, you could just forget it altogether like I do.

Ray
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post #5 of 23 (permalink) Old 01-08-2021, 09:32 AM
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As a 2008 FJR owner, I would say that mileage is abnormal for general riding. I usually get in the mid 40's even in the winter. A 5 mpg drop would indicate to me that something isn't quite right. Like JB said, check for vacuum leaks. I've had to replace the sync nipple caps for cracking and leaking on mine a couple times. Also, they may have done a crap job on the sync.

Robin
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post #6 of 23 (permalink) Old 01-08-2021, 09:54 AM
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What gitbox said ! Check the vacuum port nipple caps, being that they just did a TBS one of them may be either missing or cracked & leaking. The oe caps are fairly brittle that way.

But Iíll add that the mileage on my 14a varies a bunch depending on the right hand, my 14a by the display (not all that accurate !) fron 34 to 46 mpg. The FJR is very sensitive to throttle use !

Steve P
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post #7 of 23 (permalink) Old 01-08-2021, 02:03 PM Thread Starter
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Thank you for all the replies.
I'm going to take off the tank and check all the vacuum caps. I have some Viton caps I ordered for my Valkyrie and they will come in handy.
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post #8 of 23 (permalink) Old 01-08-2021, 05:22 PM
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We had winter and summer blends of gas here too. My gas mileage always dropped off 2 or 3 mpg in the winter. Car, truck, bike- makes no difference. Always happened.
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post #9 of 23 (permalink) Old 01-08-2021, 11:25 PM
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Having run a diesel truck as my secondary/hunting vehicle for a number of years, I always have noticed that no matter my driving habits, my fuel mileage is always less in the cooler/cold weather. Cold air does not contain as many calories (of heat) as hot air and therefore, it takes more fuel to make up the difference. Or, so I have read...
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post #10 of 23 (permalink) Old 01-09-2021, 10:37 AM
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Ride more. Worry less.

Problem solved.
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2008 Gen II
When I was a track-a-holic on my R1 & R6, I used to think that the FJR was an old man's bike. Then I got one and absolutely love it. Hey...wait a minute!
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