The mysterious stack. Dear ATVC: I’m looking at a carburated Z400 that the ad states is equipped with velocity stacks. What is that and what does it do? That’s a solid question. You don’t hear a whole lot about them these days and it gets even more confusing because they are often called things like […] More »

Extinct parts support solutions. Dear ATVC: Is there any way to buy a crankshaft timing sprocket for a 2005 Polaris Sportsman 500? The part number is # 3084882 It has been discontinued and doesn’t show an alternative part. Here is a link to the part: https://www.partzilla.com/product/polaris/3084882 Does anyone know of a compatible sprocket? Mine chipped […] More »