I need to replace my chain and sprockets and found a quick acceleration kit made by RK. Its a 520 conversion with a 14 toothed front sprocket, and the stock 43 teeth on the rear. I'm trying to see if anyone is using this or knows anyone who has changed sprocket sizes. any feed back is appreciated. Also any one using Dunlop qualifiers? if so do you like them? pros / cons / and what size tires are you using? Thanks to everyone in advance.

 

I have that exact same chain/sprocket combo (520). Great great mod. Acceleration is far quicker and I never really hit the topend so I dont care about a 4-5 mph topend decrease. You will not be disappointed!

 

Mine's in the mail, hope to get it all installed and ready for spring.