Fuel reserve - Edumacate me... - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 25 (permalink) Old 06-09-2019, 12:24 PM Thread Starter
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Question Fuel reserve - Edumacate me...

I haven't been able to find a good explanation for how the reserve fuel system works on my 2018. My motorcycles from days gone by had a petcock valve that you turned to access the reserve, but there's no such thing with the FJR, so how exactly does the reserve fuel get accessed? When my LCD is down to one segment and my indicator light is blinking, my range seems to match - going all the way down to 15 miles. But when I fill it up, I've only been able to squeeze 4.5 or so gallons into the tank. So this makes me wonder... Can anyone clear this up for me?


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post #2 of 25 (permalink) Old 06-09-2019, 12:33 PM
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That is about the same as others observe. When “reserve” kicks in and 4th display appears on the right panel counting miles on reserve, I find the 6.6 gallon tank holds 5.0 gallons.

Of course last week it made a liar out of me: 15 miles past “reserve” only held 5.002 gallons. Should have held 5.3 gallons! Is simply awful, I don’t know what to do!

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post #3 of 25 (permalink) Old 06-09-2019, 12:54 PM
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Technically there is no reserve, there is only a warning that it is getting low and you only have so many more miles to ride and then it's up to you to refill.

many of us compute mileage by miles driven and gallons used (EX: 200 miles ridden by 5 gallons to refill= 40 mpg) then multiply that to figure how far we can go (at that mileage technically you should be able to go 264 miles on a 6/6 gallon tank) . I use Trip A to let me know how many miles I have ridden in a day (I keep a log of daily miles), and Trip B to let me know how many miles are on this particular tank of gas. I usually refill when Trip B gets between 220 and 235 miles on it, but have gone as far as 250. Then when I refill I simply zero Trip B to start the process over again.
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post #4 of 25 (permalink) Old 06-09-2019, 01:03 PM
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I agree with @N4HHE and @the Ferret .


There is no "reserve" to access. Treat the gauge like the gauge in your automobile. I don't know of any cars or trucks today with a Reserve. Yamaha appears to have purposefully erred on the pessimistic side with our fuel gauges and I am okay with that. When my gauge shows empty I know I have about 1.5 gallons left. I know what my mileage averages and I make my decisions accordingly.


Unless you are willing to carry a gallon of fuel with you and run your tank dry on purpose it will be impossible for you to know exactly how much useable capacity you have. I would assume it would be slightly less than the full 6.6 gallons. YMMV... (see what I did there?)
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post #5 of 25 (permalink) Old 06-09-2019, 01:03 PM Thread Starter
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I'm thinking that I'll have to do the same - watch how many miles I think I'm getting and then just fill 'er up when it starts to get close. My ACE Tourer only got me about 125 miles before I needed to start to worry about filling up, but I do think the FJR will go better than that. At least, I hope...

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post #6 of 25 (permalink) Old 06-09-2019, 01:24 PM
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Unless there is something wrong with your bike, or you ride like a mad man, it will do 200 miles easy, and should do more than that. Do a couple tanks, refilling when it starts flashing or counting up, calculating your mileage on each tank, and you will know for sure.

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post #7 of 25 (permalink) Old 06-09-2019, 01:26 PM
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Quote:
Originally Posted by saturnnights View Post
I'm thinking that I'll have to do the same - watch how many miles I think I'm getting and then just fill 'er up when it starts to get close. My ACE Tourer only got me about 125 miles before I needed to start to worry about filling up, but I do think the FJR will go better than that. At least, I hope...
You don't have to guess about your fuel mileage. The MPG display in your instrument cluster is pretty accurate. One or two fill ups and a few seconds with the calculator on your phone will tell you how close the bike's display is to reality.


If you only get 125 miles on a full FJR tank I don't even want to know how you are riding it! I do 200 miles when I am commuting to work and back, usually 250 miles when doing normal rides and it can stretch further if I need it to. I don't like worrying about running out of fuel.
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post #8 of 25 (permalink) Old 06-09-2019, 01:53 PM
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Quote:
Originally Posted by Redfish View Post
I agree with @N4HHE and @the Ferret .

Unless you are willing to carry a gallon of fuel with you and run your tank dry on purpose it will be impossible for you to know exactly how much useable capacity you have. I would assume it would be slightly less than the full 6.6 gallons. YMMV... (see what I did there?)

And even then, that outcome only works when those riding conditions match exactly [external temp, speed, elevation, terrain, GVW (including gear and rider), distances between gas stations, right wrist, state of tune, etc.].


No amount of Googling (or asking others to Google for you) substitutes for seat time and experience with your bike of choice.
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Last edited by bounce; 06-10-2019 at 08:13 AM.
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post #9 of 25 (permalink) Old 06-09-2019, 06:59 PM
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Quote:
Originally Posted by Redfish View Post
You don't have to guess about your fuel mileage. The MPG display in your instrument cluster is pretty accurate.
Accurate? 8% high on my 2016. Wanna see my spreadsheet of 51,000 miles of fuel purchases? The top line in chart is claimed MPG by FJR Fool Computer. Bolder white with red arrowheads is actual miles divided by gallons. Red line is a running average.

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post #10 of 25 (permalink) Old 06-09-2019, 07:56 PM Thread Starter
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Quote:
Originally Posted by Redfish View Post
You don't have to guess about your fuel mileage. The MPG display in your instrument cluster is pretty accurate. One or two fill ups and a few seconds with the calculator on your phone will tell you how close the bike's display is to reality.

Well, I'm not so sure about that. My remaining miles fluctuates so wildly as I'm riding that I really don't have much faith in it. Eventually, I'll have a pretty good handle on how many actual miles I can ride before I can expect that readout to start whining, and then I'll feel a little better about things

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