16 Tooth observations - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 11 Old 12-13-2018, 01:01 AM Thread Starter
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16 Tooth observations

With the addition of a 16 tooth countershaft sprocket, now 16-47 gearing my speedo is dead on. I verified with my Garmin GPS. I used my trip odometer and gps to measure the accuracy of my odometer. 100 miles on the Garmin was measured by my bike as 95 miles, 5 % lower than true. Adjusting for the mileage error I'm geting about 43 mpg mixed freeway and city streets and only 32 mpg at 85mph / 6K rpm on the freeway. I found this to be quite dissapointing, I get 9 mpg better on my 900 lb Victory Cross Country Tour. I did have my metal side cases on so I'm sure I could add a few mpg's without their wind drag. Next I will run through a tank of fuel without the side cases and now more than 75 mph and see what results I get.

I also have Shinko 804's on my bike, I wonder if these have more rolling resistance than street tires. If they do I wouldn't expect a significant amount.
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post #2 of 11 Old 12-13-2018, 08:27 AM
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43 mpg seems low for around town. Probably near 10 mpg low. Are you checking the mileage manually? Cause if using the bikes mpg readout you won't get anywhere near real figures in my experience.
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post #3 of 11 Old 12-13-2018, 02:24 PM
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Have you noticed any negatives, such as slower acceleration? Also, what year is your 650?

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post #4 of 11 Old 12-14-2018, 03:58 PM
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I have never heard of anybody getting a fuel saving when going up a tooth on the countershaft sprocket on a 650 if that is what you were looking for.

On my Wee I got a fuel saving when I "dropped" one tooth from the front.

The Wee does not have enough HP to comfortably pull through the air so a greater throttle opening can be required to maintain speed, adding 1000rpm helps with that.

I have never owned a Glee so can't really make judgement on that.

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post #5 of 11 Old 12-14-2018, 04:07 PM
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kzryder9: I did a double cross country tour in the past year, and found my Wee was really affected by both my saddlebags/extra weight, and high speeds. I can get nearly 70 mpg indicated at home (imperial gallons) which is probably about 51 mpg actual, US gallons. With the bags and gear, doing 90 mph on I-90, I got as low as 40 mpg indicated per imperial gallon. (more like 30 mpg US gallons)

I think the wind resistance is as bad as speeds above 70 mph.
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post #6 of 11 Old 12-14-2018, 11:48 PM
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yes drag increase as the square of speed so double your speed, drag increases 4 times. it takes a lot more energy to go fast due to (parasitic) drag.

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post #7 of 11 Old 12-15-2018, 09:39 AM
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On a New England trip, I got a high of 63 mpg on the slower two-lane parts, but dropped to 41 mpg when in the 80 mph range on an interstate heading home - '15 650XT with the black box OEM bags (no top bow but a drybag). I'm running a 15:48 gear set, so a little higher rpms in all speeds but a little bit better for the woods.
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post #8 of 11 Old 12-19-2018, 04:11 PM
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Quote:
Originally Posted by realshelby View Post
43 mpg seems low for around town. Probably near 10 mpg low. Are you checking the mileage manually? Cause if using the bikes mpg readout you won't get anywhere near real figures in my experience.

Agree with Terry on doing a bit of math vs. reading it on the instrument panel. I'm running the 16/47 combo on my 013 650, readout lets say is 50mpg.... after several fill up this last year and doing some math the gauge will be 3-4 mpg low on average. I don't bother much anymore just adjust visually from the read-out what I'm prolly getting........ I do check on octanes of fuels and from what suppliers that seem to work best in my southwest ride regions, but that'll be another thread to chase.......

Guess I should add @ 60-65 mph I average 55/56 @ 75-80 mph I average 49-50...without side bags, small trunk in place, 20"mastad.
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Last edited by senoje; 12-19-2018 at 04:19 PM.
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post #9 of 11 Old 12-20-2018, 08:30 AM
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I don't go that fast
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post #10 of 11 Old 12-20-2018, 10:58 AM
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Faster speeds, riding against the wind, stop and go Gridlock and a heavy throttle hand when accelerating will kill fuel mileage

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