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I recently had my front sprocked dropped three teeth. Now, my speed guage is off about 15 mph. Say for instance it's showing 90 mph, but i'm actually going 75. I know this because I had my girl pull up beside me in the car and we compared when my guage was showing 90 mph. Does anyone else have this problem, and how do I fix it?
 

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You have this problem because the speedo pickup is off of the countershaft, and when you change the gearing then the counter shaft is going to spin at a different speed than it did before which in turn will show your speed different. To fix this they make whats called a Yellow box, its a speedo recalibrator. They run about $100 i think.
 
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