By Jon Crowley
Yamaha introduced the full-size Wolverine RMAX4 1000 for 2025, expanding the RMAX lineup with a four-seat adventure UTV designed to comfortably carry four adults without sacrificing cargo space or technical trail capability.
I joined Yamaha and other media outlets in Utah’s San Rafael Swell for an approximately 70-mile first drive through hardpack, sand, rocks, ledges, and rough desert trails. The route provided an excellent opportunity to evaluate the new RMAX4 with different passenger and cargo loads across a wide range of terrain.
The name initially caused some confusion because the previous four-seat RMAX became the Wolverine RMAX4 1000 Compact. However, the distinction makes sense once the two machines are viewed side by side.
The RMAX4 Compact retains a shorter, more maneuverable platform with convertible rear seating. The new full-size RMAX4 uses a considerably longer wheelbase, fixed rear seats, full-length rear doors, and a separate dumping cargo bed. It is designed for owners who regularly carry four adults or need more room for longer adventures.
For complete specifications, trim details, and current pricing, see our 2026 Yamaha Wolverine RMAX4 Buyer’s Guide.
Testing the Yamaha RMAX4 in the San Rafael Swell
Our test began near Temple Mountain Road, approximately 30 miles west of Green River, Utah. From there, we completed a loop that included Eagle Canyon, Swaseys Cabin, Eva Conover Road, Coal Wash, and Devils Racetrack.
The San Rafael Swell is remote, rugged, and extremely scenic. More importantly for a first drive, the route included very few perfectly graded roads. We encountered hardpack, loose sand, embedded rocks, ledges, uneven climbs, and rough trail sections that tested more than straight-line acceleration.
Doing a little rock crawling in the new RMAX 4
This terrain highlighted what the RMAX4 is designed to do. It is not a pure sport UTV built around maximum horsepower or high-speed desert performance. It is an adventure-focused machine intended to comfortably transport passengers and gear through challenging terrain.
FOX shocks on the RMAX 4
h2>A Full-Size Four-Seat RMAX
At 150.8 inches long with a 118.1-inch wheelbase, the full-size RMAX4 is substantially longer than the RMAX4 Compact. That additional length creates a much larger rear cabin and allows Yamaha to retain a separate cargo bed behind the rear seats.
The longer platform also gives the RMAX4 a planted and confidence-inspiring feel. It remained stable on rough trails, climbs, and uneven terrain without feeling excessively cumbersome for a four-seat machine.
There is a tradeoff. The RMAX4 needs more room to turn and maneuver than the Compact, particularly on tight switchbacks or heavily wooded trails. Yamaha’s Turf Mode helps by unlocking the rear differential, allowing the inside and outside rear tires to rotate at different speeds through a turn. This reduces tire scrub and can slightly improve maneuverability while also protecting lawns and other sensitive surfaces.
The full-size RMAX4 is especially well suited to open Western trails, mountain routes, and long-distance adventure riding. Owners who regularly travel on narrower East Coast trails may prefer the shorter RMAX4 Compact.
Our guide to choosing the right Yamaha Wolverine RMAX provides a closer comparison of the available platforms.
FOX Suspension Is the Standout Feature
The suspension was the first thing that stood out during the drive.
The RMAX4 provides 14.2 inches of front suspension travel and 16.9 inches at the rear. More important than the raw travel numbers, however, is how well Yamaha balanced the spring and shock package for changing passenger and cargo loads.
With only one person aboard, the suspension felt plush and compliant over rocks and rough terrain. A suspension tuned primarily for four passengers can feel unnecessarily stiff when the vehicle is lightly loaded, but that was not the case here.
The RMAX4 also handled a full load of four adults, a spare tire, and a gear box in the bed without excessive sag or a dramatic reduction in ground clearance. Accommodating that much variation in payload while preserving ride quality is difficult, and Yamaha did an impressive job.
The dual-rate springs provide a compliant initial portion of the travel while offering additional support as the suspension compresses or the vehicle carries more weight. Combined with the long wheelbase, the setup gives the RMAX4 a composed ride that suits long trail days.
Two FOX shock packages were available for 2025. The XT-R uses FOX QS3 piggyback shocks with three-position compression adjustment at each shock. The Limited upgrades to FOX iQS, allowing the driver to select different compression settings from inside the cabin.
QS3 offers simplicity and easy tool-free adjustment. The iQS system is more convenient when a ride transitions between slow rocky trails, faster roads, and changing passenger or cargo loads. Instead of stopping to adjust each shock, the driver can change the setting from the seat.
The Limited’s iQS suspension was one of my favorite features of the RMAX4.
Predictable Power Instead of a Horsepower Contest
Power comes from Yamaha’s 999cc liquid-cooled, DOHC parallel-twin engine. Yamaha tunes this engine for usable low- and midrange performance rather than chasing the acceleration of a turbocharged sport UTV.
That approach fits the RMAX4’s mission. Power delivery is predictable, controllable, and well suited to technical terrain. It has enough performance to remain entertaining on open trail sections, but its biggest strength is the ability to smoothly move four passengers and cargo through difficult terrain.
Yamaha’s D-Mode system provides Sport, Trail, and Crawl throttle-response settings. These modes do not limit the engine’s available power. Instead, they change how quickly the engine responds to accelerator input.
Trail provides balanced response for most recreational driving. Sport sharpens the response for more aggressive driving and open terrain. Crawl softens the initial response, making it easier to carefully apply power over rocks, ledges, and other technical obstacles.
Crawl may be especially helpful for newer drivers, but it is not merely a beginner feature. Experienced drivers can also benefit from the finer pedal control when precise tire placement and smooth power delivery matter.
One drawback is the amount of engine and drivetrain noise that reaches the cabin, particularly under acceleration. The RMAX4 is comfortable and well equipped, but it is not the quietest machine in its category.
Ultramatic Transmission and Engine Braking
Yamaha’s Ultramatic transmission continues to be one of the Wolverine RMAX lineup’s strongest mechanical features.
The system uses a centrifugal wet clutch and maintains constant tension on the drive belt. Instead of relying on the belt to slip during initial engagement, the wet clutch manages engagement while the belt remains under tension.
The result is smooth, predictable power delivery at low speeds. I felt no noticeable belt slip during our test, including while rock crawling in High range when I should have selected Low.
That experience demonstrated how forgiving the system can be, but owners should still use Low range for slow technical terrain, steep climbs, heavy towing, and other high-load situations. Proper range selection reduces heat and unnecessary drivetrain stress.
Yamaha backs the Ultramatic drive belt with its 10-Year CVT Belt Warranty, which provides additional confidence for owners planning to keep the machine for the long term.
The one-way sprag clutch also provides predictable all-wheel engine braking. On steep descents, the system helped control vehicle speed without requiring constant pressure on the brake pedal. The response felt natural and consistent rather than abrupt.
Smooth clutch engagement and controlled engine braking may not be the most exciting features on a specification sheet, but both become extremely valuable on long or technical trail rides.
Full-sized cab with room for four adults
Genuine Room for Four Adults
The RMAX4 is not simply a stretched machine with two occasional-use rear seats. The rear cabin is genuinely suitable for adults.
Full-length rear doors improve entry and exit, while the longer chassis creates substantially more legroom than the RMAX4 Compact. At six feet one inch tall, I could sit comfortably in the back without feeling cramped.
That makes the RMAX4 a realistic option for families and groups who intend to use all four seats throughout the day. The rear seats also include dedicated grab handles, textured floor areas, and enough room for passengers to reposition their feet during longer rides.
Rear-passenger visibility is not as open as it is in some four-seat sport UTVs. The seating layout and surrounding bodywork can limit the view from the back, particularly on technical trails. However, the overall space and comfort are impressive.
The separate cargo bed is another major advantage. Owners do not have to choose between carrying rear passengers and creating room for equipment. The RMAX4 can transport four adults while retaining a 600-pound-capacity dumping bed for a spare tire, cooler, tools, camping equipment, or other gear.
It can also tow up to 2,000 pounds, giving it meaningful utility around a home, ranch, campsite, or hunting property.
New Adventure Pro
Adventure Pro and Cabin Technology
The 2025 RMAX4 introduced an updated Yamaha Adventure Pro system with a seven-inch full-color display integrated into the dashboard.
Bluetooth and USB connectivity provide access to phone and audio functions. The system also offers GPS mapping, vehicle information, customizable screens, navigation compatibility, and PIN-lockable geofencing. Limited models include a factory rearview camera.
Built-in GPS is a useful feature for a machine designed to explore remote areas. The rearview camera is also valuable on a vehicle with a long wheelbase and limited visibility directly behind the cargo bed.
Adventure Pro does not offer the same integrated group-ride functionality found in Polaris Ride Command. Riders who want to see other members of their group on the map will need another navigation or communication solution.
Even with that limitation, having mapping and vehicle information integrated into the dashboard is a meaningful advantage over starting with a basic display and adding a separate GPS later.
XT-R or Limited?
Both trim levels include the RMAX4’s core mechanical advantages, including the 999cc engine, Ultramatic transmission, On-Command four-wheel drive, 30-inch tires, and long-travel FOX suspension.
The XT-R is appealing because it combines FOX QS3 shocks with factory beadlock wheels. Its manually adjustable shocks are simple and effective, particularly for owners who tend to leave the suspension in one setting for most rides.
The Limited adds FOX iQS suspension and a factory rearview camera, making it the more convenient choice for riders who regularly transition between different terrain and payloads.
I prefer the Limited because of the in-cab suspension adjustment and rearview camera. However, it is disappointing that Yamaha does not include beadlock wheels on its top trim. Buyers must choose between the XT-R’s beadlocks and the Limited’s additional technology.
What Stood Out
The suspension was the clear highlight of the first drive. It delivered a comfortable ride with one person aboard while continuing to support four adults and cargo without excessive sag.
Other strengths included:
- Genuine rear-seat room for adults
- Long-wheelbase stability
- Smooth Ultramatic clutch engagement
- Predictable all-wheel engine braking
- Useful built-in GPS mapping
- A separate dumping cargo bed
- Turf Mode and selectable front differential lock
- Yamaha’s 10-Year CVT Belt Warranty
Potential Drawbacks
The RMAX4’s longer wheelbase requires more turning room than the RMAX4 Compact, making it less ideal for unusually tight trails.
Engine and drivetrain noise are noticeable inside the cabin, especially under acceleration. Rear-seat passengers also have more restricted visibility than they would in some sport-oriented four-seat machines.
Adventure Pro provides useful built-in mapping but lacks an integrated group-ride feature. Owners interested in moving beyond the factory 30-inch tires should also research clearance and clutching requirements before installing 32-inch or larger tires.
We later explored some of those changes in our Yamaha RMAX4 buildup and long-term review, including 32-inch tires, clutching, suspension upgrades, communications, and additional cargo storage.
Lunch stop at Swaseys Arch
Final Thoughts
The 2025 Yamaha Wolverine RMAX4 1000 is an impressive four-seat adventure UTV that prioritizes passenger comfort, suspension performance, technical control, and long-term drivetrain confidence.
It is not intended to compete with turbocharged sport UTVs in a horsepower contest. Its strengths become apparent over a full day on the trail, especially when carrying passengers and gear through varied terrain.
The FOX suspension was the biggest surprise during our San Rafael Swell test. Its ability to remain plush when lightly loaded while properly supporting four adults and cargo gives the RMAX4 a level of versatility that is difficult to achieve.
The full-size cabin, separate dumping bed, smooth Ultramatic transmission, strong engine braking, and long-wheelbase stability make it a compelling choice for families, hunters, campers, and anyone planning long adventure rides.
Buyers who prioritize a shorter turning radius or frequently ride extremely tight trails should also consider the RMAX4 Compact. For those who regularly carry four adults and want room for gear without sacrificing trail capability, the full-size Wolverine RMAX4 1000 is definitely worth a closer look.
Shoppers comparing other four-seat recreational machines can also read our Yamaha Wolverine RMAX4 versus Can-Am Maverick Sport MAX comparison.
