If you've spent any time on the trails lately, you probably know that a torn yamaha grizzly 660 seat is a quick way to turn a great ride into a soggy, uncomfortable mess. There is nothing quite like hitting a deep puddle only to realize your seat foam has acted like a sponge, soaking up every drop of muddy water through a tiny crack in the vinyl. If you own a 660, your machine has been around the block a few times. These ATVs are absolute tanks, but even the toughest machines have parts that eventually give out, and the seat is usually one of the first things to show its age.
The Yamaha Grizzly 660 was a game-changer when it first hit the scene in the early 2000s. It had the power, the independent rear suspension, and the reliability that made it a legend. But because these quads are so reliable, many of them are still out there working hard on farms or tearing up trails twenty years later. Two decades of sun exposure, freezing winters, and heavy boots swinging over the back take a toll on the upholstery.
Why Your Seat Is Probably Failing
It isn't just about the looks, though a shredded seat definitely makes a clean quad look like a junker. The main issue is the integrity of the foam. Most yamaha grizzly 660 seat assemblies use an open-cell foam. It's comfortable and bouncy when it's dry, but once that outer vinyl layer gets a puncture or a "sun-crack," the foam starts absorbing moisture.
If you leave it alone, that moisture trapped inside will eventually rot the foam from the inside out. You'll start to notice the seat feeling "mushy" or losing its shape. Even worse, if you live somewhere cold, that water-logged foam will freeze solid in the winter, making it feel like you're sitting on a block of ice. Taking care of it early is way better than waiting until you're literally sitting on the plastic base plate.
Evaluating Your Options: Cover vs. Full Assembly
When you decide it's time to fix the situation, you basically have two paths. You can either buy a new yamaha grizzly 660 seat cover and DIY the repair, or you can buy a complete aftermarket seat unit.
Going the Seat Cover Route
This is the most common choice because it's the most budget-friendly. You can find plenty of aftermarket covers that are designed specifically for the 660's dimensions. Honestly, if your foam is still in decent shape—meaning it isn't crumbling or missing chunks—a new cover is all you really need.
When shopping for a cover, look for marine-grade vinyl. It's designed to handle UV rays and temperature swings without cracking as easily as the cheap stuff. Some people also prefer "gripper" seats, which have a bit of texture to keep you from sliding around when things get muddy or steep. It's a nice upgrade over the stock smooth vinyl.
Buying a Complete Seat
If your seat base is cracked or the foam is completely trashed, a cover isn't going to save you. In this case, you're looking for a complete yamaha grizzly 660 seat assembly. This includes the plastic pan, the foam, and the cover already installed. It's a "plug and play" solution. You just pop the old one off and click the new one in. It's more expensive, but it saves a ton of time and frustration, especially if your original seat is beyond saving.
How to Install a New Seat Cover Yourself
If you decide to go the DIY route, don't be intimidated. It's a project you can finish in an afternoon with a few basic tools. You'll need a flat-head screwdriver or a pair of pliers to pull out the old staples, and a heavy-duty staple gun to put the new cover on. An electric or pneumatic staple gun is much better than a manual one, as the plastic seat pans on these Yamahas can be pretty tough.
The secret to a professional-looking yamaha grizzly 660 seat is heat. If you try to stretch cold vinyl, you're going to end up with wrinkles and a lot of swearing. Do the job on a warm day, or better yet, use a hair dryer or a heat gun (on a low setting!) to warm up the vinyl. This makes it much more pliable.
Start by centering the cover and putting one staple in the front and one in the back. Then, work your way around the sides, pulling the material tight as you go. If you see a wrinkle forming, pull that staple out, stretch the material a bit more, and try again. It takes a little patience, but getting that tight, factory look is worth the effort.
Fixing the Foam Before You Cover It
If you've pulled off your old cover and found that the foam has a few chunks missing, don't worry—you don't necessarily need a whole new seat. You can actually "patch" the foam. Some people use spray foam or even pieces of high-density foam from a craft store.
Just trim out the rotten or damaged section, glue in the new piece, and then use a serrated knife or a sanding block to shape it until it matches the original contour of the yamaha grizzly 660 seat. It doesn't have to be perfect because the vinyl cover will hide minor imperfections, but you want it smooth enough that you don't feel any weird lumps while you're riding.
Choosing the Right Style for Your Ride
Since you're replacing it anyway, you might want to think about whether the stock style is actually what you want. The 660 is a utility machine, but many people use them for aggressive trail riding.
- Camo Patterns: If you use your Grizzly for hunting, a camo seat cover is a no-brainer. It helps the machine blend in and usually hides dirt and blood better than solid colors.
- Two-Tone Designs: Some aftermarket covers come with different colored side panels. This can give your older 660 a more modern, "sporty" look.
- Extra Padding: If you spend long days in the saddle, some companies sell seat covers with integrated gel pads or extra foam layers. Your lower back will definitely thank you after an eight-hour ride through the woods.
Don't Forget the Seat Latches
While you have your yamaha grizzly 660 seat off the machine, take a second to look at the mounting hardware and the latch. These parts can get gummed up with dirt and old grease over time. If your seat has been wiggling or feeling loose, it might just need the latch adjusted or a little bit of lubricant. A loose seat isn't just annoying; it can be dangerous if it shifts while you're side-hilling or navigating a technical section of the trail.
Keeping Your New Seat in Good Shape
Once you've got your seat looking brand new, you probably want to keep it that way. The biggest enemy of any ATV seat is the sun. If you store your Grizzly outside, try to keep a cover over it or at least park it in the shade. UV rays bake the plasticizers out of the vinyl, which is what causes it to get brittle and crack.
Another tip is to be careful when cleaning. Harsh chemicals can actually strip the protective oils out of the vinyl. Usually, some mild soap and water are all you need. If you want to use a protectant, make sure it's one specifically designed for outdoor vinyl and—this is the important part—make sure it isn't one that makes the seat slippery. There's nothing worse than hitting the brakes and sliding right up onto the gas tank because you used a "high-shine" automotive spray on your yamaha grizzly 660 seat.
Final Thoughts on the Grizzly 660 Seat
At the end of the day, your seat is one of the most important contact points between you and your machine. If you're uncomfortable, you're not going to enjoy your ride, and you're probably going to head back to the truck sooner than you wanted to. Whether you decide to spend a few bucks on a basic cover or go all-out on a custom-padded replacement, fixing up your yamaha grizzly 660 seat is one of the best "bang-for-your-buck" upgrades you can do. It makes the quad look better, feels better, and keeps you dry. That sounds like a win to me.