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Real-world gas mileage effects when changing sprocket sizes (?)

7.8K views 53 replies 25 participants last post by  inflex  
#1 ·
I was just wondering if anybody here has changed their sprockets to achieve shorter/taller gearing and if they have noticed a big difference in gas mileage as a result.

My '06 was getting 33mpg consistently with stock gearing. With the 14t front sprocket, I got 28mpg the last time I filled up.

Sure, my gas mileage is terrible if you compare it to what others claim to get on their SVs, but the important thing to note is that I lost 5mpg with the loss of one tooth up front.

What are your observations for those of you who have changed sprockets?
 
#4 ·
with my 650 i didn't notice much difference but I was getting 55-60mpg. I think it did go down a bit but my commute changed at the same time. My 1000 its about the same allso.
 
#5 ·
Well i didn't get to ride it much before i changed my sprockets. But my first fillup with the SV i got 42 mpg. Then i changed sprockets (+2) and when i would do nothing but fly around on country rodes and quick town trips i'd get 38-40 mpg, and then i did a long 500 mile weekend of mostly highway and got 52 mpg. Granted all of these are probably off a bit due to the fact that the stock speedo reads high. But they're still alot better than your numbers.
Are you running 92 octane or something?
 
#7 ·
rdblckSV650S said:
Well i didn't get to ride it much before i changed my sprockets. But my first fillup with the SV i got 42 mpg. Then i changed sprockets (+2) and when i would do nothing but fly around on country rodes and quick town trips i'd get 38-40 mpg, and then i did a long 500 mile weekend of mostly highway and got 52 mpg. Granted all of these are probably off a bit due to the fact that the stock speedo reads high. But they're still alot better than your numbers.
Are you running 92 octane or something?
Speedo reads high because of purposly added error , but odometer is very close

where is you go +2, in front or rear

I originally got 48-54 mpg until I had full system & jets installed,

my milage dropped to 36-40 mpg

I went to 16t front sprocket and got milage back up a little to 38-42mpg
 
#9 ·
RandyO said:
Speedo reads high because of purposly added error , but odometer is very close

where is you go +2, in front or rear
I went +2 in the rear. I thought it was pretty obvious, as i can't imagine wanting to add teeth to the front.

I tested my speedo against a new civic on the freeway and found that my speedometer is 10% off. That may not matter much on the odometer, but i sure don't like my speedo telling me i'm going 90 when i'm actually going 81.
I plan on getting a 70 series front tire when the time comes and i've heard that helps get it closer to dead on accurate.
 
#11 ·
AlfBoy said:
Best I get is 34 mpg with stock gearing. But I am constantly in traffic and use nasty watered down california fuel.
You know what I think? All the people who claim to get anywhere near 50mpg are either too stupid to do the math correctly, weigh under 80lbs, ride under 3,000rpms, or some combination of all of the above.

That's what I think.
 
#13 ·
MorganB said:
You know what I think? All the people who claim to get anywhere near 50mpg are either too stupid to do the math correctly, weigh under 80lbs, ride under 3,000rpms, or some combination of all of the above.

That's what I think.
my experience is you get your best fuel economy at about 5000 rpm

rolling on throttle to speed rather than whacking is open makes a big difference, not only to fuel economy, also tire life and chain & sprocket life
 
#14 ·
MorganB said:
You know what I think? All the people who claim to get anywhere near 50mpg are either too stupid to do the math correctly, weigh under 80lbs, ride under 3,000rpms, or some combination of all of the above.

That's what I think.
Gee, I hope not. That means there is no hope for increasing mile---HEY, there's a squid emoticon now!! WOOT! Nexus242 Nexus242 Nexus242 Nexus242
 
#15 ·
RandyO said:
rolling on throttle to speed rather than whacking is open makes a big difference, not only to fuel economy, also tire life and chain & sprocket life
That, and trying to maintain speed instead of constantly braking and acceperating for corners... Rolling up to junctions etc to avoid stopping if possible. I'm not sure if this holds true for bikes but I read once that it takes more fuel to get a car from 0mph to 10ph than it does to get from 10mph to 40mph.

Not that I do any of that, mind :)
 
#16 ·
MorganB said:
You know what I think? All the people who claim to get anywhere near 50mpg are either too stupid to do the math correctly, weigh under 80lbs, ride under 3,000rpms, or some combination of all of the above.

That's what I think.
or different people's mods.
I have a desnorkeled airbox, tank risers, and a slip on. On the freeway i'm at 6500 rpms. Almost the entire 500 mile trip i did was at 6500 rpms on the freeway. This is when i got 52 mpg. And no i'm not doing my math wrong. I set my tripometer every time i fill up, then divide the mileage by the number of gallons i put in, down to the 100th decimal.
I usually get around 38 miles per gallon, and that's cruising at 5k rpms or ripping above.
I weigh 175lbs before gear by the way, and i'm not kind to my bike. I got the R6 throttle tube for a reason.
 
#17 ·
I went up three teeth on the rear of my first gen and don't remember what I was getting for mileage before but now I'm getting 47mpg regularly. fuel light always starts flashing between 150 and 151mi.

Zach
 
#18 ·
completely stock bike, went from 14-50 too 14-52 and i lost 20 miles to a tank and 10 m.p.h. on the top end. I ride like gas is free and usually get 100-110 miles to a tank.
 
#19 ·
azrider said:
completely stock bike, went from 14-50 too 14-52 and i lost 20 miles to a tank and 10 m.p.h. on the top end. I ride like gas is free and usually get 100-110 miles to a tank.
this is on an SV650? Thats like +8 in the rear. And isn't the stock front sprocket a 15t?
I got 110 miles to a tank on my RC51. If you're getting that bad of mileage on your SV650 then something wrong.
 
#20 ·
MorganB said:
You know what I think? All the people who claim to get anywhere near 50mpg are either too stupid to do the math correctly, weigh under 80lbs, ride under 3,000rpms, or some combination of all of the above.

That's what I think.
hahaha

+1 to what RandyO and Morgan have said.

I get about 50 or so MPG average (town and hwy). I get on it some, but i strive to be as smooth to the throttle as i can. I usually keep the RPM around 4k or so.. usually shift at 5k, 5k on the hwy... and then of course, if i feel frisky, i wack her right open...

still keeping getting 50mpg. and trust me, not doing the math wrong

completely stock bike beside mufflerectomy (and motosliders/desticker, but that adds hp, not gas mileage :tard: Nexus242)



hahahahahahahaha Nexus242 is Nexux 242 without the space.. so cool
 
#21 ·
MorganB said:
You know what I think? All the people who claim to get anywhere near 50mpg are either too stupid to do the math correctly, weigh under 80lbs, ride under 3,000rpms, or some combination of all of the above.

That's what I think.
Image
Sorry, 218 without gear, average cruising rpm of around 5-6k, and well, that math isn't too hard, even for me... got 46mpg yesterday joyriding, 48 on my Friday fillup after commuting the three days prior. Maybe the dealer never took the plastic wrap off your air filter? :dontknow:
 
#22 ·
Before installing the belt drive on my SV, I ran chains for several years with a Scottoiler. I ran both 16 teeth and 17 teeth on the countershaft. My experience is that for each tooth you add on the countershaft you gain 3 mpg. If you flog it continually you will get much worse mileage. There are several driving techniques you can use to get better mileage. Accelerate when it is convienient to(downhill), run in as tall a gear as possible, streamlining / areodynamics. In the 1980s my company Rifle was able to get 378 mpg on a 185 cc single cylinder Yamaha traveling up and down the California coast on hwy 1 averaging 45 mph in traffic(rear world conditions). Some of the modifications were ceramic coating the top of the piston and combustion chamber, removing one of the two valve springs, manual ignition retard for climbing hills in taller gears. I made a belt drive for it too for a much taller more efficient drive train.

Running chains and taller gearing on the SV I usually got around 50 mpg. My latest belt configuration stock gearing (same as 15/45 with a chain) gave my 55 and 59 mpg on my runs part inland and part on the coast and back. I switched directions on the two runs. These were two lane road routes no interstate taveling. The reserve light started flashing at 164 and 176 miles. I filled up the tank at 205.5 miles, 3.5 gallons. This was pretty regular riding. 75 mph on the straight hwy stretches. I weigh 170 lbs.

You will get better mileage traveling somewhere that you get on a bunch of short local trips.

Zak
 
#23 ·
MorganB said:
You know what I think? All the people who claim to get anywhere near 50mpg are either too stupid to do the math correctly, weigh under 80lbs, ride under 3,000rpms, or some combination of all of the above.

That's what I think.
maybe you just dont know how to ride the SV to get good gas mileage?

im 220lbs and switch way early if i dont have to accelerate fast, im in 6th probably by 40mph and get 54mpg, if i gun it alot i get 47mpg... which translates to about 180-something miles between fill ups, keep in mind that more than half of my riding is non freeway
 
#25 ·
MorganB said:
You know what I think? All the people who claim to get anywhere near 50mpg are either too stupid to do the math correctly, weigh under 80lbs, ride under 3,000rpms, or some combination of all of the above.

That's what I think.
well, you could ride with me, watch me fill up, then watch me calculate my gas milage dividing the miles driven by the gallons filled, then watch me zero my trip odo. I have a 45mile commute at average about 40-55mph, twisty roads, if I get stuck behind someone slow, I pass them, I go full throttle to pass cause I dont like being in the wrong lane for long, I weigh 235-245lbs, you can tell this by one look at me. I get 50-53mpg constantaly with stock gearing. I also ride 600miles a week, so I know its not just a fluke, its constant. I also have a yosh pipe and K&N and a snorkle still in place and I pulled the powercommander off (I WAS getting 42-46mpg). I keep the RPMs between 4-6 thousand, use the engine to brake as much as I can, I dont often clutch it in for long downhills, and my route is about 70%highway (not interstate) 30% cityish. there are a few corners I downshift and rip through at 6-7k rpms.
I also have a 2nd gen
 
#26 ·
I'm a fatass. Bike is a naked. I went up 2 teeth in the back. I'm running pods with 215/220 mains. Please don't make me calculate it out. And I ride it like a grandma (I ride it like your grandma, fast, hard, lots of wrist action, and burning rubber). :thumbsup: