CBR 1000F "Hurricane" 1987-1996 CBR 1000F

new sprockets, now speedo's off

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Old 08-07-2008, 11:08 PM
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Default new sprockets, now speedo's off

I was wondering if anyone knew how to correct the speedo after changing the sprockets. It is way off. Thanks
 
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Old 08-08-2008, 02:00 AM
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Default RE: new sprockets, now speedo's off

How manyteeth were on the sprockets you fittedto put the speedo so far out ? ive never heard of a way to adjust a speedo mine out by a bit but not that much ..
 
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Old 08-08-2008, 02:46 AM
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Default RE: new sprockets, now speedo's off

Speedo normally reads about 10% over. If you change front sprocket to 16 teeth, add another 7%, and 3 teeth on the rear, another 7% (give or take a bit) so if you run, say, 16F/45 rear you'll be about 24% over on the speedo.
To my knowledge, recalibrating the speedo isn't a quick fix, is costly, and requires professional help.......
 
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Old 08-08-2008, 11:15 AM
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Default RE: new sprockets, now speedo's off

Thanks for the help. I am actually running a 16/46. Thought I would try it out. So far I love it. I can really feel the torque. The only thing is a traction issue. Doesn't want to lift the front wheel just wants to spin the rear.
 
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Old 08-08-2008, 12:15 PM
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Default RE: new sprockets, now speedo's off

If you really HAVE to lift the front wheel, go to 15T front -
1KF's are nose heavy, and hard to lift.......can be done but not good for the gearbox, chain etc
Fuel bill will be NASTY...prob. around 25 % more than before......
 
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Old 08-10-2008, 09:54 PM
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Default RE: new sprockets, now speedo's off

Odd. I just changed my sprocketsthe old front was 15 instead of the stock 17, rear was 45 instead of the stock 42. Speedo still reads the same: 5000 rpm equals 80 mph. Isn't the speedo driven off the front wheel? If so, changing sprockets shouldn't change the speedo reading.

Craig
 
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Old 08-11-2008, 02:28 AM
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Default RE: new sprockets, now speedo's off

What year is your bike ? 89 on run speedo from the front sprocket.......
 
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Old 08-11-2008, 03:23 AM
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Default RE: new sprockets, now speedo's off

speedo from the front sprocket

[IMG]local://upfiles/25866/0FA31C39B3784BD29214355A0BDE325D.gif[/IMG]
 
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Old 08-12-2008, 05:59 AM
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Default RE: new sprockets, now speedo's off

Im one tooth down on the front. Used a GPS and here are the numbers ON WHAT I REMEMBER:

Reading(MPH) Actual
35 30
65 55

 
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Old 08-13-2008, 03:39 PM
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Default RE: new sprockets, now speedo's off

I think I may have worded that wrong. It is a good thing that it is not lifting the front. I meant it is now just an issue with traction. I am not looking to make a wheelie machine out of this heavy girl, just some more low end torque. It is definitely there now. As for the speedo. Thanks for the help. I will deal with it
 


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