CBR900 sprocket advice - Honda Motorcycles - FireBlades.org
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post #1 of 19 Old 11-27-2008, 2:24 PM Thread Starter
 
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CBR900 sprocket advice

Hi all,

might as well introduce myself! im monkey i recently treated my self to a cbr900 1998 model, i live in the uk (berkshire area if anyones near by and fancies a ride!) i also own its older brother, the cbr400 NC29,


and obviously the fireblade


i have standard sprocket set up on the cbr900 but wanted to increase excelleration and make it slightly easier to lift the front, anyone run this sort of setup that could offer advice would be most apreciated! also am running the 016 tyre is this a good sticky tyre? seems to be ok, i run the alpha 10 on the 400 and thats awsome.

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post #2 of 19 Old 11-27-2008, 9:58 PM
 
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Re: CBR900 sprocket advice

Well my 96 i had had the -2 and 5 up. It was a previous stunt bike. She would wheelie at 100 with no problem. I'd just go -1 up 2
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post #3 of 19 Old 11-28-2008, 4:49 AM Thread Starter
 
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Re: CBR900 sprocket advice

thanks very much for the reply, how much top end would i loose?
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post #4 of 19 Old 11-28-2008, 8:58 AM
 
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Re: CBR900 sprocket advice

Doesn't changing the sprocket sizes alter the speedo / odometer readings on the 'Blade?
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post #5 of 19 Old 11-29-2008, 8:53 AM Thread Starter
 
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Re: CBR900 sprocket advice

Oh, if anyones got a race exhaust or the two ends for a 98 exhaust they dont want could you send it my way
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post #6 of 19 Old 11-29-2008, 8:59 AM
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Re: CBR900 sprocket advice

Quote:
Originally Posted by Monkeycbr View Post
thanks very much for the reply, how much top end would i loose?
Well, 15/47 (-1+5) on my 929 still pulls a genuine 250kph+ - more if I was happy to bounce it off the limiter.
Since the 929 was good for around 270 I guess it knocked about 20kph off the top end.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #7 of 19 Old 11-29-2008, 9:00 AM
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Re: CBR900 sprocket advice

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Originally Posted by Destructo View Post
Doesn't changing the sprocket sizes alter the speedo / odometer readings on the 'Blade?
Altering spockets on almost any bike made since the mid-nineties will alter your speedo and odometer.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #8 of 19 Old 11-29-2008, 11:08 AM Thread Starter
 
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Re: CBR900 sprocket advice

ok great thanks blade
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post #9 of 19 Old 11-29-2008, 10:15 PM
 
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Re: CBR900 sprocket advice

how would it alter the speedo and odometer???
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post #10 of 19 Old 11-29-2008, 11:12 PM
 
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Re: CBR900 sprocket advice

I was told not to drop the front sprocket because of ware and tear
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post #11 of 19 Old 11-30-2008, 12:35 AM
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Re: CBR900 sprocket advice

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Originally Posted by Mervyn View Post
how would it alter the speedo and odometer???
Because the speedo drive nowadays is taken from the output shaft.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #12 of 19 Old 11-30-2008, 12:44 AM
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Re: CBR900 sprocket advice

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Originally Posted by ETSLOSS View Post
I was told not to drop the front sprocket because of ware and tear
Dropping from a 16 to a 15 means each tooth does 1/16th more work than it did before so it will wear 1/16th faster.
If you go too low on the front you risk wearing out the swingarm buffer as well.

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post #13 of 19 Old 11-30-2008, 8:55 AM
 
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Re: CBR900 sprocket advice

speedo healer will sort the speedo out regardless of what sprocket changes you make.

I ran -1f +2r and found this too much on the road and will swap back to -1/+1 for everyday use. -1f +2r was good on a race circuit though I must say.
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post #14 of 19 Old 11-30-2008, 2:11 PM
 
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Re: CBR900 sprocket advice

IM going +4 in the rear and staying at 16 in the front i also bought a 15 front if im still not happy.... Im going off of bladeracers advice he seems to know his stuff
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post #15 of 19 Old 11-30-2008, 2:22 PM
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Re: CBR900 sprocket advice

Perhaps - there are lots of riders that are perfectly happy with stock gearing though as well :-)
Do you run lowered gearing on the 400?
I assume you're replacing the chain and both sprockets?
+4 on the rear is unlikely to fit with the existing chain.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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