If you've spent any time at the dunes or on the trails, you already know that the stock yamaha banshee swingarm is usually one of the first things riders look to replace when they start pushing their machines. It's not that the factory part is "bad" for a stock bike, but let's be real—most Banshees aren't stock for very long. Once you start messing with the pipes, the carbs, and the porting, the way that power hits the ground changes completely, and that's where the swingarm comes into play.
The swingarm is the backbone of your rear suspension. It dictates how the bike handles the "whoops," how well it hooks up during a launch, and whether or not the front end stays on the ground when you crack the throttle. Choosing the right one is about more than just picking a cool color; it's about matching the geometry to your specific riding style.
Why People Swap the Stock Swingarm
Most guys looking for a new yamaha banshee swingarm are doing it for one of two reasons: they need more length to keep the front end down, or they're sick of the old-school carrier adjustment system. The stock Banshee uses a "twin-row" carrier that can be a real pain to adjust. Over time, those bolts get seized, the carrier gets pitted, and keeping your chain tensioned becomes a Saturday afternoon nightmare.
Upgrading to an aftermarket swingarm almost always moves you over to a "round house" style carrier. This is a game-changer for maintenance. Instead of fiddling with multiple bolts and trying to keep things aligned, a round house setup lets you rotate the entire carrier to tighten or loosen the chain. It's faster, simpler, and way more reliable when you're out in the middle of nowhere.
Deciding on the Right Length
This is where most people get stuck. You'll see swingarms listed as +2, +4, or even +10. Those numbers refer to how many inches longer the arm is compared to the stock length.
The Short and Sweet (+0 to +2)
If you're riding tight woods or hitting a motocross track, you probably want to stay close to stock length. A +0 or +2 yamaha banshee swingarm keeps the wheelbase short, which means the bike stays "flicky." You can whip it around corners and navigate tight trails without feeling like you're driving a school bus. A +2 is a popular "do-it-all" length because it gives you just a bit more stability without sacrificing that aggressive turning capability.
The All-Rounder (+4)
The +4 is arguably the most popular choice for the average Banshee owner. It's the "Goldilocks" length for guys who spend half their time in the dunes and the other half on fire roads. It gives you enough leverage to keep the front tires on the dirt when the powerband kicks in, but it's not so long that you can't turn. If you've got a mild port job and some decent pipes, a +4 will help you actually use that horsepower instead of just looking at the sky every time you hit the gas.
The Sand Specialist (+6 and Beyond)
Once you get into +6, +8, or +10 territory, you're looking at a dedicated drag bike or a hill climber. These long arms are built for one thing: straight-line traction. When you have a high-horsepower stroker motor, a short swingarm is actually dangerous. A long yamaha banshee swingarm acts like a giant lever, pushing the rear tires into the sand and preventing the bike from flipping over backward. Just keep in mind that a +10 swingarm turns about as well as a cruise ship.
Material Matters: Chromoly vs. Aluminum
Most high-quality aftermarket swingarms are made from 4130 Chromoly steel. It's the industry standard for a reason. Chromoly is incredibly strong but has a tiny bit of "flex" to it, which is actually a good thing. It can soak up the vibration and the brutal landings that come with aggressive riding without cracking.
You will occasionally see aluminum swingarms, which are definitely lighter and look great polished up. However, they can be a bit stiffer. For most of us who aren't professional drag racers trying to shave every possible ounce, Chromoly is the way to go. It's durable, it's easier to repair if something catastrophic happens, and it holds up to the abuse of the trail.
Don't Forget the Carrier and Bearings
When you buy a new yamaha banshee swingarm, it's the perfect time to refresh everything else back there. Don't try to save twenty bucks by reusing old, crunchy bearings. Most people go for a billet aluminum round house carrier with twin-row or even tapered bearings.
Tapered bearings are great because they handle side-loads much better than standard ball bearings. If you're a heavy rider or you like to slide the bike through corners, tapered bearings will last much longer. Also, make sure your new setup has a grease zerk. Being able to pump fresh grease into the carrier without taking the whole rear end apart is a luxury you'll appreciate after a muddy ride.
Installation Tips and Tricks
Swapping out your yamaha banshee swingarm isn't exactly rocket science, but it can be a "character-building" experience if your pivot bolt is stuck. The long bolt that runs through the frame and the engine cases is notorious for seizing up. If you haven't pulled yours in a few years, start soaking it in penetrating oil a few days before you plan to do the swap.
When you're installing the new arm, use a generous amount of waterproof grease on that pivot bolt. You'll thank yourself five years from now when you have to take it apart again. Also, pay attention to your chain length. If you're going from a stock arm to a +4, your old chain isn't going to fit. You'll need a longer chain (usually 120 or 130 links, which you'll then cut to fit) and likely a longer rear brake line.
Handling Changes and Expectations
One thing people often forget is that changing the swingarm length changes how your rear shock performs. Because a longer swingarm puts more leverage on the shock, it will feel "softer" than it did before.
If you go with a +4 or +6 yamaha banshee swingarm, you might find that your rear end sits a little lower or sags more when you sit on it. You can usually compensate for this by adjusting the preload on your rear spring, but if you're going really long, you might eventually need to get the shock re-valved or swapped for a stiffer spring to keep the ride height where it belongs.
Final Thoughts
Investing in a quality yamaha banshee swingarm is one of those upgrades that changes the entire personality of the quad. It's not just about the "bling" factor (though a powder-coated arm does look killer). It's about tailoring the bike to how you actually ride.
Whether you're looking for the maintenance ease of a round house carrier or the stability of an extended wheelbase, take the time to think about where you spend most of your time riding. Don't go for a +10 just because it looks cool if you're riding through tight woods—you'll hate it within ten minutes. Stick to what fits your terrain, keep those bearings greased, and you'll find that your Banshee handles better than it ever did from the factory.