That engine is rubber-mounted with
bigger mounts to better isolate the
engine rumbles from the frame, which
in turn keeps them from reaching the
floor and steering wheel. As an added
bonus, the new powerplant rewarded
Yamaha well for adding an extra piston
and roughly 140cc more displacement.
Torque is up a whopping 47 percent over
the Wolverine’s 708cc single. That allows
the CVT to be set to shift at a lower rpm
to keep the machine feeling calm. A
larger-than-normal muffler and improvements in the air intake system also help
quiet things down. Helical and spiral
gears also lower mechanical sound, and
both sound and heat are battled with an
insulated center console.
To quantify the improvement, Honda’s
always-smooth and quiet Pioneer 1000
is (claimed to be) 2 decibels louder.
According to automotive aftermarket
company Quiet Ride Solutions, “Sound
reduction is based on an algorithmic
scale. An easy way to understand that
sort of sound is to think of 100 decibels
as being the sound that a chop saw
emits as it rips through a two-by-four.
A reduction of only 10 decibels is a
50-percent reduction in sound that the
human ear can detect.” Considering that
Yamaha is comparing the Wolverine X4
to the already-quiet Honda (with no CVT
to make a racket), this is a significant
difference. We welcome the efforts to
reduce sound and heat in the cab.
To maximize cargo room, you tip up the
rear seat base, then slide the seats all the
way forward. You are left with a good-sized cargo area rated for 600 pounds.
Right, the X4 has a drive-by-wire system called
Yamaha Chip-Controlled Throttle (YCC-T). It includes
an under-hood key that limits the X4 to 25 mph.
Note that the rubber-mounted muffler is longer than
normal. The hitch is rated for 2000 pounds. The suspension
is self-leveling to make up for cargo and passengers.
The SE models have the fancier
colors for interiors, but all X4
models have a well-appointed
interior that is supportive
and comfortable for all four
There is ample under-body
protection on the Wolverine X4,
even though it has almost 11
inches of total ground clearance.