im think this is a vortex sprocket on a f4i. does this sprocket need to be replaced or is it aight? note: this bike has 23000 miles on it. thanks.

 

oh ya you better get a new chain and sprocket set.

 

Get that **** replaced man. I had the same vortex sprocket in the same situation(Ninja Star Effect). Always kept an eye on the teeth though. Got lazy one week and didn't check it, before I knew it half the teeth were gone. Gave me a reason to go 10 up in the rear though!!