Editing Yamaha XV500/reviews



When the Virago 500 began its trip down the drawing boards, Yamaha's designers must have figured the task
was more like play, a working vacation perhaps. The original Virago was a an
air-cooled V-Twin with shaft drive and full cruiser treatment, as in stepped
seat, small tank and high bars. The model hit the target market right on
center and the Virago 750 was Yamaha's sales hit of the year.
Traditional looks, traditional
engine configuration, so it made perfect sense to take another old-time
favorite, the 500 Twin, and scale down the Virago theme to fit the smaller
engine. Lower seat, lower price, proven looks and engineering, it's bound to
work.
And so it does, but with some reservations.
They have little to do with the
mechanical package. The 500, like the 750 and 920 Vees, is air cooled, but
the angle of the vee is 70° for the small engine vs 75° for the larger ones.
Good reasons here. The best balanced vees are 90°, and the closer together
you go from there, the less good the balance gets while the package itself
becomes smaller and more easily packaged. Because the Virago 500 is small,
the tighter angle allows a shorter wheelbase with room for suspension
travel, etc.
The same applies to the Yamaha's
other two 70° Vees, the Vision 550 Twin and the Venture 1200 Four. Except
that those two engines produce more power and thus need water-cooling and
coun-terbalancer shafts.
The Virago 500 is not as highly tuned or stressed, so like the other
air-cooled Vees it neither has nor needs water jackets or counterbalancers.
The 500 shares concept with the 750 and 920 but no parts. The two valves per
cylinder (37mm intake, 32mm exhaust) are opened via aluminum rockers by a
single camshaft running in the cylinder head casting. Intake valve lift is
7.2mm, exhaust valve lift 7.7mm, and valve lash is adjusted with screw
tappets. The cams are driven by link-plate chain off each end of the
plain-bearing crankshaft.
Cast-iron sleeves are pressed
into the aluminum cylinder castings. The cast pistons are moderately domed,
producing a 9.3:1 c.r., and use internally-tapered wrist pins located in the
center of the pistons, with no offset. Bore is 73mm, stroke 59mm for 494cc
of displacement.
Primary drive is straight-cut gear to the clutch basket. From there, power
is transmitted through the clutch hub to the transmission mainshaft, through
one of the five gearsets to the driveshaft and through another set of bevel
gears to the rear wheel. The engine spins in the same direction as the
wheels.
Two 23mm Mikuni CV downdraft
carbs are positioned between the cylinders. Along with the carbs there is a
small, two-chamber tank that serves as part of the YICS (Yamaha Induction
Control System). We've seen YICS before, on inline Fours, in which the
intake ports of the engine are connected by small passageways intersecting
each port just past the intake valve. An inline Four has regularly paced
pulses in the intake tract and these passageways take advantage of the
pulses to (in effect) boost the charge entering each cylinder in sequence.
Another form of YICS appears on the Yamaha two-strokes, where the regular
but more widely spaced intake pulses are stored and reinforced in a
container now popularly known as a boost bottle.
For the Virago 500, Yamaha uses
another form of YICS, this one shared with the 550 Vision. Because a V-Twin
has an irregular firing order the Virago's secondary ports aren't connected.
Instead each cylinder has its own chamber in a YICS tank, connected by a
passageway leading to the intake port just above the intake valve. When the
valve shuts, the mixture still entering the port escapes up the passageway
into the YICS chamber, which is precisely sized so pressure continues to
build up until the intake valve opens again. When the valve opens, the
pressure in the YICS chamber rushes into the cylinder again in the form of a
jet stream and swirls the mixture entering through the intake port proper.
The rest of the engine package is simple enough: electronic ignition, wet
sump, exhaust system with an expansion box (located just behind and below
the engine), dual mufflers.
The engine is a stressed member
of the frame, and there are no downtubes or engine cradle tubes. The four
forward cyk inder studs extend above the cylinder head and attach to a plate
suspended from the frame's backbone. That backbone is formed of stamped
steel plates, welded together in box section and curving from steering stem
to swing arm pivot. The rear of the engine bolts to the backbone in two
places, one above and one below the swing arm pivot.
The backbone is sealed and serves as the air intake system. A rubber plenum,
located under the seat and left sidecover,
feeds air into the backbone, which forms a still air box. A pleated paper
air cleaner fits into the backbone just above the carburetors.
A single rear shock bolts to the backbone, under the front of the seat, and
runs down and back to a triangulated steel swing arm. The frame rear
subsection, which supports the seat and tail section, bolts to the backbone
tube on the top and the footpeg carriers on the bottom. The swing arm pivots
in tapered roller bearings.
The leading-axle non-adjustable
forks have 36mm stanchion tubes held by a steel lower triple clamp and an
aluminum upper clamp. These clamps are different in more than material. The
lower triple clamp has less offset than the top triple clamp, so the
Steering Head Angle is different from the fork rake. The difference is 1.5°,
the steering head set at 29°, the forks set at 27.5°, producing a long 4.9
in. of trail. Two rubber-mounted risers bolt to the top triple clamp and
hold the tubular steel pullback handlebars. The front wheel is 1.85 in. wide
and holds a 3.00-19 Bridgestone L303 tire, the rear rim is 2.5 in. wide and
holds a 130/90-16 Bridgestone G509 tire. Both wheels are cast aluminum in
the now common swirl pattern used on most Yamaha Virago and Maxim models. An
11.75 in. disc is used for the front brake and a 7.1 in. drum is used in
back.
Because the lowest part of the teardrop-shaped gas tank is lower than the
carburetor float bowls, an electric fuel pump is used to feed the carbs. The
pump supplies more fuel than the carburetors need, the surplus recirculating
to the gas tank. According to Yamaha engineers, this recirculation system
lowers gasoline temperatures an average of 50°. Lowering fuel temperatures
can reduce evaporative emissions, which will be controlled on California
motorcycles in 1984.
Instruments include a 120-mph
speedometer and a 10,000 rpm electric tach (redline is 8500 rpm), with a
simple row of warning lights positioned below the instrument faces. Those
lights indicate turn signal and high-beam use, low oil level and neutral
selection. There isn't a fuel gauge; the gas tank petcock has a reserve
position.
Comes now a persuasive case for simplicity. Because the two are very
different motorcycles from the same factory, the Virago 500 and Vision 550
can be considered as two ends of same scale. Yamaha claims a modest 33 bhp
for the Virago, an impressive 68 bhp for the Vision. However, the Virago's
claimed torque is 30.4 lb.-ft. at 7000 rpm against the Vision's 34 lb. ft.
at 8000 rpm, and with tanks half full the Virago weighs 402 lb. and the
Vision weighs 482 lb.
Power requires weight, tuning means the power grows out of rpm, and torque
is mostly a function of displacement.
And at the drag strip the Virago
turned 13.70 sec. for the quarter mile with a trap speed of 93.55 mph and
the Vision (Cycle World, April 1983) did 13.05 sec. at 99.33 mph. More to
the point in daily living, in top gear acceleration the Virago is actually
quicker; 40-60 mph in 5.4 sec. vs 5.8 for the Vision.
Sure, the sporting Vision is quicker and faster and the more complex package
can justify itself... to the rider who wants it.
(It's also interesting to note how close are the middleweight and big Twins,
from Yamaha, Honda, Harley, BMW, Triumph, et al. Be they 1000, 750, or
500cc, they all turn the quarter mile in the high 12s to high 13s while the
big Fours are much quicker than their smaller brothers.)
At any rate, the Virago's strong
mid-range and easy-on torque supply make it great fun to ride on the street.
It's perfectly happy tooling down the road at less than 3000 rpm, and will
leave traffic behind when short-shifted at 4000 rpm. It's equally happy when
run to the red-line in every gear, the power delivery strong and steady with
an extra kick of bhp above 6000 rpm.
The 500 is more willing to rev
quickly than the larger Viragos and stays smoother in the process. The 500
responds whenever the throttle is opened, no matter where the engine is in
the rpm range. There isn't any surge at steady throttle when threading
through traffic jams, and there's no hesitation off idle when the throttle
is opened quickly. And all the time there's that intriguing V-Twin exhaust
note, muffled on the 500 but there just the same, the off-cadence beat that
says, well, motorcycle.
Some notes on smoothness, or maybe on size: We have all read and heard at
great length about counterbalancers, rubber mounts, offset crankpins, frames
tuned to absorb engine shake and other ways to cure or dissipate the
vibrations inherent in any Twin.
Know what works? Size, or more accurately lack of size.
The technical advances mentioned
above are advances. They do quell the tremors. But when an engine has
smaller pistons it also has smaller tremors and the uncomplicated little
Virago is smoother than the 750 or 920 Viragos or the Honda Shadow 750 or
Harley 1000. There are vibrations, sure, but what the rider gets is little
more than a reminder of an engine at work. No problem here, the mirrors even
remain clear at cruising speed.
The Virago 500 is also a narrow engine, just 13.5 in. across, and the
combination of narrowness, light weight and the broad powerband encourages
sporty riding. The Virago is an in-between size, feeling more a full-size
motorcycle than a 450 or 400 and seeming incredibly light compared to most
550s, especially 550s with Inline Four engines.
The light weight and short
wheelbase make the Virago nimble, good for cornering, and make it more
easily disturbed by sidewinds and wind blasts from semitrailers on the
highway, not so good for straight-line touring. But the Virago is stable at
top speed and in fast, sweeping corners. The suspension is not adjustable
(except for rear shock preload) and comes set up a bit on the stiff side.
The trade-off is a choppy ride over repetitive bumps in the roadway.
Speaking of trade-offs, we've arrived at the Virago 500's downside. It began
back on the drawing board, when the Virago 500 was scaled down.
The cruiser look began as a
chopper look and choppers were originally built from Really Big Twins. Low
seats, kick-out front ends, stretched wheelbases and the riders could easily
lean back, put their feet up and stretch out. Those first Specials, Customs,
etc. had the look but not the dimensions. Since then the Big Four has
learned to deliver the looks after amending the style to allow for more
compact machines.
This works up to a point; the [[Yamaha XS1100]] and [[Honda CB1000C]], for example, can be cruised and ridden while the Honda 650 Night-hawk has cruiser elements while still being fine
in daily use.
The Virago 500, though, doesn't have the wheelbase or any of the other
distances to be both a cruiser and a good place on which to go riding.
Riders of average height found the 500 cramped. The bars come back too far
and the ends rotate inward toward the tank, making the bars into tillers.
The bend of the bars cock the rider's wrists at an unusual angle and,
because the control pods are shaped to follow the handlebar contours, makes
it harder to reach the controls with the thumb.
The horn button, for example, is
tucked down and inward on the left control pod, and the one time one rider
needed the horn, all he got with his thumb was a blank space on the control
pod. The footpegs had some riders searching for someplace to put their feet
during long rides, and the one-position-only seat didn't help riders avoid
feeling cramped. Those are the prices of the Virago's style.
The hornor, more correctly, the
hornsare loud enough when the button is finally located. The headlight was
everything a headlight should be bright penetratingly and perfectly aimed.
The turn signals are self-cancelling, and can be manually over-ridden by
pushing down on the side-to-side signal switch. Over-riding the signals
often caused the switch to hang-up the next time the rider wanted to signal
a turn, and it took prodding and poking at the switch before the signals lit
again.
The Virago's brakes are good enough, being very controllable throughout our
stopping tests. From 60 mph, the bike needed 119 ft. to stop; from 30 mph,
30 ft.
On the Cycle World mileage test loop, the Virago 500 returned 51 mpg in the
standard combination of open highway, country road and city traffic. Ridden
hard on backroads, mileage dropped to 47 mpg.
The fuel tank holds 2.9 gal.,
which gives the Virago a total range of between 136 and 148 mi., depending
upon how it's ridden. Reserve is usually good for 16-20 mi. at highway
speeds.
So what have we in this Virago 500? We have a V-Twin simpler and lighter
that the Yamaha Vision, and, at a suggested list price of $2299, less
expensive as well. The flip side of that is that the Virago isn't as quick
or fast at the dragstrip.
The Virago is fun to ride, feels
light and agile, sounds neat, gets good gas mileage. It also compromises
rider comfort with styling, styling far enough into the cruiser mode to
deter riders who don't care for that look, yet perhaps too conservative to
appeal to hard-core cruiser fans.
The Virago is indeed a motorcycle in the middle, good as it may be. Q
Source Cycle World 1983