I have always used a 42 tooth rear sprocket (1 tooth bigger than stock) only because it comes in the chain sprocket kit that I buy. I didn't notice a difference between the two when I first switched it over. Probably wouldn't have to go too much bigger before you can feel a noticeable difference. 45-47? But have a longer chain that you can cut down to size ready to go as a 104 link chain may not be long enough for a sprocket that big.
2006 Ninja500R Purchased new July 2006; 0 miles. Miles as of January 2019; 102,137. It's a GO bike, not a SHOW bike.
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