[FazerKid78]

I ordered a 520 conversion chain and sprocket kit today. I accidentally ordered a 48 tooth rear sprocket instead of a 46. Anyone have an opinion on this? I know that makes the gearing a little shorter. I'm thinking about just going ahead and putting it on. I guess it will improve acceleration but how much? Any advice would be awesome!

 

[RJN2112]

If you kept the OEM front sprocket size, you changed the ratio (shorter) about 4%. -1 up front +2 on the back will change it by a shade over 11% (shorter).

 

[rockscaler]

Gearing Commander: Motorcycle Gearing Ratio Sprocket RPM Speed Chain Calculator

It will be better unless you like high top speed, in the twisty turn pulling out of a corner will be more fun, highway rpm will be a bit higher,

 

[FazerKid78]

Yeah, I have almost 30,000 miles on the stock chain and sprockets and they are on their last leg. My bike is my only transportation right now and I don't think I can afford to wait to send them back and wait for a 46 tooth sprocket. 4% shorter isn't too drastic.

 

[FB400]

FazerKid-
how did the sprocket change work out? I was thinking of doing this same mod only would be dropping -1 tooth on the front as well. How are the rev's on the highway at 65 to 70mph?

FB

 

[Airhead]

I've run a -1+2 setup and that usually put my revs about 1,000 higher for any given speed over stock gearing.

 

[FazerKid78]

To be honest, I don't really like it. It messed up my speedo and decreased gas mileage. The trade off is serious wheelies in first gear and a lot better acceleration. I prefer the stock setup.

 

[rennsport]

To be honest, I don't really like it. It messed up my speedo and decreased gas mileage. The trade off is serious wheelies in first gear and a lot better acceleration. I prefer the stock setup.

My speedometer is already reading about 8% higher than actual speed, and it is annoying. So a 48 tooth sprocket can't make it any worse, as far as I'm concerned.

I never complained about the acceleration of the FZ6, from a dead stop, but, this mod would probably help when riding 2 up. I will bet the 48t sprocket, when a new chain & sprockets are called for.

I did go -1 in the front on my Ducati Monster and that has been the best and cheapest mod you can make to that bike.

 

[FB400]

I've heard guys report that the stock setup on the FZ6 is about a 4% error right out of the factory. I checked mine against the friendly neighborhood police radar (permanently mounted, not on partrol car!). Seems dead on accurate. What my speedo says is exactly what shows up on the sign showing mph.

I would hate to have my speedo be off. Changing even just one tooth on the from sprocket would mean error. As much as I don't want to spend the cash for a speedohealer, I would have to go with it. having the speedo be off would just be too annoying to deal with

 

[rennsport]

I've heard guys report that the stock setup on the FZ6 is about a 4% error right out of the factory. I checked mine against the friendly neighborhood police radar (permanently mounted, not on partrol car!). Seems dead on accurate. What my speedo says is exactly what shows up on the sign showing mph.

I think that should read: "could be off by 4% OR HIGHER". It seems the speedo accuracy is all over the place. This is not limited to just Yamaha. BMW bikes (and cars) have long been known for optimistic speedometers and range of error can be broad.

I would hate to have my speedo be off. Changing even just one tooth on the from sprocket would mean error. As much as I don't want to spend the cash for a speedohealer, I would have to go with it. having the speedo be off would just be too annoying to deal with

Well mine is off by 8% and as much as I dislike it, I am not spending money to fix such a problem, that should not even exist on a new bike.

I just adjust my riding speed to make up for the error.

 

[FB400]

Hey that's cool if you are good at interpreting the speedo with 8% error! I just don't trust myself. Also, with that kind of error, I would think you are logging more miles on the odo than you are actually doing. Over a few years that could affect resale value

 

[rennsport]

Hey that's cool if you are good at interpreting the speedo with 8% error! I just don't trust myself. Also, with that kind of error, I would think you are logging more miles on the odo than you are actually doing. Over a few years that could affect resale value

The odometer MUST be accurate (well to at least 1/10 of a mile, since that is the max resolution on most odometers), or any auto maker would be setting themselves up for a nasty class-action lawsuit!

It is real easy to bump the speedo reading by x%, while still retaining the accuracy of the odometer.