A Stage 2 upgrade for Harley-Davidson involves everything in Stage 1 plus minor motor modifications—hotter cam(s), adjustable pushrods, etc, and requires a full exhaust rather than slip on mufflers to achieve its full potential. Some riders even consider a big bore kit to still be Stage 2 since complete bolt-on kits are readily available these days, but popular opinion pegs any increase in engine displacement (via bore OR stroke) down under Stage 3 alongside cylinder head porting and other specialty engine work. Finally, Stage 4 is usually reserved for forced induction or extreme naturally-aspirated engine builds, alcohol motors—things rarely seen outside of drag strips and bike shows.  

Whatever your engine aspirations may be, RevZilla carries a premium offering of engine parts, from upgraded internals to external covers—a wide selection of hop-up parts including camshafts, adjustable pushrods, big-bore kits, and Twin Cam cylinder heads! We also stock the small items you need (if you don’t pick up a complete Stage 2 or 3 kit) like gaskets and filters. That's not all, though - we've got flash to go with your dash! If you need a sparkly points cover or you'd like a set of new rocker boxes, Revzilla has what you're looking for—why not get in touch with one of our Harley Gear Geeks and let us help you pick the perfect parts for your horsepower goals?