I was just checking to make sure the stock chain for a 2002 CBR F4iI is a 525? I was also wondering if there would be a big difference if I choose to go with the 520 conversion?

 

The stock chain is D.I.D. 525. Does it make a difference to go with a 520? Some says it does and some says it doesn't. I did a 520 conversion and changed my front sprocket to a -1 which is 15 tooth. That made more of a difference that I noticed. Faster accerlation on the low end.