14t Sprocket

[c_rex]

On most of my bikes, it does not feel like I lost any top speed at all--I just get up to top speed a lot faster...: )
With a taller geared bike, it takes so long to get up there you run out of safe space to do it in most cases...

I think aerodynamic drag is such a bigger factor in top speed any way.

-M

I concur with Martin wholeheartedly.  I didn't notice any loss on my S4RS either.  It's just plain more fun to ride in all gears.

[Xiphias]

For what is worth: this is the best mod- I've made. After I purchased my Honda, the S2R 800 was on its way to the garage queen but upgrading the to a 14T sprocket put the a noticeable kick in the front end which has made the bike a blast again.

Rob

[desmobloke]

I Europe, at least, it seems that the 15 tooth sprocket helped to get Monsters get through tough emission and noise regulations, presumably lowering the engine speed at given road speeds.
What ever the reason, fitting a 14 tooth to my '02 750ie transformed the bike, particularly around town. Fitting was simply a matter of loosening the chain right back, removing the cover and the two bolts that hold the retaining plate. Reversing the process with the new sprocket. No need to remove a link from the chain. Then check chain tension and wheel alignment. Bingo.

[Serenitynow]

Best mod yet =14T!! I'm running 14t/38 stock rear on a M750. I almost feel like I could go to 40 or 41 in the back and still be good on the freeway.  I often run in 4th awhile and then go "Oh, I still got another gear I can go to and then brings the revs down"!  Anyone else run something like 14/41?

[aa4111]

That site is cool - and the best part is I had no idea my 620 would do 205 mph!
140 be damned!  ;:|

You sure that wasnt kmh, as is set by default? Changed to mph it says 137 mph

[yellowjacket]

I'm also interested in doing the 14t mod. does anyone have a handy instruction? I don't have any tools (yet) so if I have to take into a shop what's a good price? In that note, is it okay to take my duc into a "regular" bike shop (the closest shop to me is a Honda garage) to do quick work like changing out the spocket? or should I always go to an authorizued shop?

[arai_speed]

Not that many care, but doesn't this affect the speedo and the mileage?  I though I had read that going down 1 in the front sprocket makes the speedo more optimistic, meaning it will say you are traveling at 65mph when in reality you are going 60mph...or something like that.

Also, a smaller sprocket means more revolutions which means an increased in recorded miles? no?

All and all it sounds like a good mod.

[Jnaids07]

Not that many care, but doesn't this affect the speedo and the mileage?  I though I had read that going down 1 in the front sprocket makes the speedo more optimistic, meaning it will say you are traveling at 65mph when in reality you are going 60mph...or something like that.

Also, a smaller sprocket means more revolutions which means an increased in recorded miles? no?

All and all it sounds like a good mod.

The speedometer/odometer readings are based on the back wheel's rotation.  Theoretically the only thing that would throw it off is changing tire/wheel combination and it affecting the radius.  It seems to be somewhat universally accepted that the speedometer inaccuracy increases as the speed gets higher.  I am not sure if anyone has actually calculated the % off they are at different speeds to see if it is just equally bad at all speeds, or if it gets more than proportionally worse at higher speeds. 

(EDIT:  The below is assuming that the innacuracy % is changing with a greater speed.  If it is proportional at all speeds then this doesnt apply.)

I have 2 guesses. 

1)  There is an inherent problem with the accuracy of the speedometer and as speeds increase, the inaccuracy increases proportionally to the speed.
2)  As speed increases, the centrifugal force stretches the tire, thus increasing the circumference, thus as speeds increase the wheel would rotate fewer times than expected (if calculating rotations from a lower speed/smaller circumference)

Anyone have an answer? 

[spinned]

after 10,000 miles with a 14t... this mod is clearly the best performance improvement you can make for the money... hands down.

[duc996]

+1 great for city riding as well.

[DucatiRider_MN]

I was thinking of doing this at my 7500 mile service. Is it a bad idea to add a new front sprocket to an existing chain? I thought i read somewhere before that is best to do this with new parts.

[c_rex]

I was thinking of doing this at my 7500 mile service. Is it a bad idea to add a new front sprocket to an existing chain? I thought i read somewhere before that is best to do this with new parts.

Generally speaking, yes- depends on the wear of the chain and rear sprocket.  I did mine at the same time I converted to a 520 pitch chain (and related rear sprocket).  There are full kits out there that make the change le$$ painful to your wallet.

[eltristo]

I presume this will throw off the speedo though.  Is there a quick fix on that end?

[Evil_Ductator]

I presume this will throw off the speedo though.  Is there a quick fix on that end?

The answer to that question is 5 posts up.

[eltristo]

Oops.  That one looked long, so I skimmed/skipped it.  Dumb me.