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Just bought a 2001 rc 51 with the power commander. The previous owner changed the rear sprocket from the stock 40 tooth to a 42 tooth. My question is -Will this affect my speedometer? I guess I could ride along side someone and check! Just want some feedback. Thanks!
 

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Just bought a 2001 rc 51 with the power commander. The previous owner changed the rear sprocket from the stock 40 tooth to a 42 tooth. My question is -Will this affect my speedometer? I guess I could ride along side someone and check! Just want some feedback. Thanks!

The answer is YES...your speed-o will be off.

BTW, 15/41 is the gearing of choice for the fiddy1.
 

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I've just been through this myself, here's the solution:

Installed the speedohealer on my bike Friday night. Nice product, easy to install,
perfect correction of my speedo. No more reading 12mph faster than actual speed!!!!

My bike has different chain/sprockets installed and the prior owner never corrected the speedometer. The speedohealer ties into your factory harness, and allows you to correct the display. I took my bike up to 60mph actual, determined by my Garmin GPS, then noted my speedometer, it read 72mph!!!
I followed the correction formula in the speedohealer instructions and entered the corretion factor into the unit of -16.6%. Perfect!!

The speedohealer is $109. and available from California Sportbike.
http://www.calsportbike.com/cgi-bin/store/index.cgi

The only terrible thing is, it took 14 days from time of order to delivery!

John
 
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