Front sprocket change

[dazza]

The time has come for me to change my front sprocket, has anyone gone one tooth up or down and if so what were the benefits/drawbacks. I understand it may affect the accuracy of the speedo but not sure which way. I have this little niggling voice in my head that says just leave it standard so any input would be welcome. Cheers.

[steve pring]

Pat's page has some info and figures on the 15 tooth sprocket change and also the rear sprocket which you might find helpful in deciding.
Its a fairly cheap and quick mod to do and you can always go back if its a bit too much.
I'm sure some others will be along and give you their experiences to help as well.
http://www.cartestsoftware.com/fz1/15toothfrontsprocketinstallation.html

 http://www.cartestsoftware.com/fz1/47toothrearsprocketinstallation.html

[PieEater]

I had considered changing the ratios when I have to relace my C&S in the not too distant future but after looking at the costs of a speedo healer and taking into consideration the decrease in fuel economy I've discounted the idea. My Ivanised Fazer is quick enough and if I need to accelerate quicker dropping a couple of gears isn't that much of an effort.
 
You say you're changing your front sprocket but dont mention the chain or rear sprocket, general concensus is it's better to replace the whole lot at the same time.

[kebab19]

17t front sprocket fitted

2-3 more mpg

Speedo now 99% accurate

Slight loss of acceleration, but still more than acceptable

[ghostbiker]

I didn't want to change a whole front tooth so went up 2 on the rear. Pepped up acceleration. Didnt notice a drop in top end as the speedo started over reading, then fitted a speedo healer.
Also didn't notice any mpg diff, but I wasn't recording mpg figures when I did the change. If it did make a diff it wasn't by much.
The down side is it is a little more revs on the motorway. So at the ton it is a little buzzy
This would be more so at 1 front tooth so I am glad I did 2 on the rear.

[Ian-man]

Well I went 1 off the front and 1 on the back.  Like poop off a scoop now and revs still ok as I don't do over a ton usually.

No need to change down for overtakes.

Speedo reads about 11% out. Reads 90 when doing 80 on satnag GPS. So a speedohealer needed to sort but living with it as is for now.

[dazza]

  As usual, very helpful. Thanks fella's.