are AFAM sprocket any good
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Watch the 520 kit, i have a buddy with a gsxr600 who put a 520 kit on his bike. dont remember what brand chain but it was a name brand like RK or DID. The chain snapped in half and busted up his left side fairing, rear cowl and went right through the stator cover. i had a 520 on my bike and changed it right after his broke, it had been less than a year and the chain was very worn already. stick to a 525 it will last longer.