It's easy to gear a bike tall. All you
have to do is put on big countershaft sprocket and a real small rear sprocket.
When you do this, the bike gains a huge amount of top speed, but it sure takes a
long time to get there. And when you get into top gear, well… the acceleration
is positively lazy.
This, however, was not the case with
the Baja 1000-winning XR650 Honda ridden by Johnny Campbell.
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Johnny
Campbell stands proudly behind his butt-kicking Honda XR650R. The he
chewed his nails and sweated bullets when he let us ride the beast.
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Bruce Ogilvie, the man behind the
development of the XR650R, brought the Baja bike out with him during our test
session of the new XR650s.
Quite naturally, we were eager to
sling a leg over this bike, just to get a feel. Bruce looked a bit nervous, but
just asked us to take it easy on the gearbox, as he had no spare gears at the
time and a race was coming up soon.
He also informed us that the bike was
exactly in the condition it was after the end of the Baja 1000. Heck, the engine
hadn't even been rebuilt. All they did was change the oil, slap on some fresh
tires and do a valve adjustment.
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In
spite of a dry weight of 270, Campbell's bike doesn't feel that
heavy when you ride it. On normal jumps, it flies neutral and level,
with no gymnastics required.
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Bruce also noted that the bike had
been timed at 114 miles per hour, with the Baja gearing, so low gear might be
just a tad tall.
OK. Now go back to that first
paragraph and re-read it.
Done? Good. Then forget what you just
read, because it did not apply to the Baja-tuned XR650.
This bike positively RIPPED through
the gears!
While it's normal for most any bike
to spin the rear wheel under hard acceleration in the lower gears, we didn't
expect the Honda to throw a huge rooster-tail in top gear, as well!
That's right, bunky. This gnarly
beast sprayed dirt back like a jet-ski, in 5th gear, and the
acceleration was as brutal as your garden-variety 500 cc two-stroke MX dirt bike
with stock gearing.
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Our
test track had a small supercross-style section on it, and we talked
JC into doing some casual jumps.
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After a few passes from a standing
start to flat-out, I was curious as to how quick the bike was. With no
light-guns or speed traps at my disposal, I resorted to the old
glance-at-the-stop-watch technique.
My best guess is a bit over 13 seconds
to get the bike would out tight to 114 miles per hour.
Why is my timing relegated to a guess?
Maybe it's because I almost wet myself glancing down at the watch at 114 miles
per hour to get a reading. You think it's easy? Well, it ain't! So you'll
just have to live with my guess-timate.
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He
responded by landing on the downslope smoothly, just like McGrath and
friends.
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The rush of going at that speed ? on
dirt - is incredible!
Aside from the sensation of the
landscape going by at blurry-eyed speed, some other things penetrate your
frontal lobes; first of which is that the bike was rock-solid stable at 114
miles per hour, in spite of the fact I was on slippery, baked-dry Mexican adobe
dirt.
The other important sensation is that
the XR650 goes exactly where you want it, without thinking about it. Directional
changes at high speeds take little more than a nudge at the bars and a slight
shift of your weight, with a tweak at the throttle … and that sucker is locked
in to the new direction like a homing missile.
Since this was a modified racing
version, it was substantially stronger than the basic Honda.
Here are the numbers:
- Stock strangled-EPA bike ? 43
horsepower
- Lightly modified bike, as per
dealer specs ? 55 horsepower
- Campbell's Baja bike ? 67 plus
horsepower
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The
Baja XR650R felt extra stable on the high-speed sections, including
this particularly gnarly downhill. Just gas it and go!
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For details on getting the stock bike
to run right, refer to our in-depth article in the January issue of ORC. As you
might recall, we were the only publication to test the truly stock version of
the bike, and the only one to tell you how to fix it.
Amazingly enough, once you do the
basic cleaning up/jetting mods on the stock bike, it puts out more actual
horsepower than the 628 XR that Campbell won the 1998 Baja 500 and Baja 1000
with.
RACE MODIFICATIONS
- The compression ratio has been
jacked up one full point.
- Real race gas is used to deal with
the increased compression.
- Answer tapered aluminum bars are
used, with special bar clamps.
- An IMS big fuel tank is used, with
a dry-brake filler for speedy gas dumping.
- An Ohlins adjustable steering
damper is used to keep the front end stable when whacking rocks and ruts at
speed.
- IMS tank is vented through the
steering head hollow stem.
- Exhaust system is twin pipe, twin
muffler, made of stainless steel. And yes, the sound of the exhaust is
genuinely thrilling at full honk.
- DID premium chain is used. Gearing
is set for 114 mph.
- Slight internal gearing changes
were made to yield the most flexibility and widest use of power in the
all-important 45-70 mph range, where the bike is most of the time during
Baja-style racing.
- The airbox has been heavily
modified and runs a K & N filter. Large holes were also cut into the
airbox lid and screen was riveted to the lid to keep rocks out.
- Special ultra-wide pegs were
fabricated.
- Factory special Kayaba forks were
used with about an inch more travel than the stock bike. Lower legs are
carbon fiber outer skins with a metal liner inside. They're about three
pounds lighter than stock, and the triple clamps have more clamping surface
and are stiffer.
- Oil-in-frame sight lines allow you
to check the oil level at a glance.
- Dunlop rock-eating tires are used
for desert racing.
- A special mid-range torque cam
replaces the stocker.
- Increased windings make for greater
lighting capabilities.
- A works KYB (high-priced stuff)
shock is used. And, no, you cannot get one. The range of adjustments is
greater than stock, and the valving is made of bi-metal, which expands and
contracts with internal temperature changes, to keep the actual damping
action consistent.
- Frame and swingarm are completely
stock.
- Numerous nuts, bolts and fasteners
are the lightweight high-priced spread.
- There's some foam stuffed between
the plastic skid plate and the frame, to keep junk from accumulating there.
- The kickstand has been removed,
which saves about two pounds.
- Bike has been carefully re-jetted
to accommodate carb, intake and exhaust changes. A very, very cold plug is
used for the high speed running.
WHAT'S IT LIKE?
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Hand-fabricated
stainless steel exhaust pipes tuck in tightly, reduce weight and add
some horsepower.
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Actually, the race bike is easy to
start. No mystery. Just get a crate to stand on, keep your handoff the throttle,
find top dead center, go a notch past that, and give it a mellow kick. It'll
snarl to life.
The bike is a cold-blooded beast, and
requires a long warm up. This is good, which means that the cooling system does
a superior job.
You don't hear a lot of
tick-tick-tick noises from the engine. It's tight.
The bike is tall, but once you park
your buns in the saddle, it feels right. At 5'8 ?", I can touch both
toes to the ground when sitting centered on the saddle.
When taking off on the race bike,
there's a slight flat spot right off the bottom, which means you can stall it
if you're not aware of this glitch. But with a slight slip of the clutch and a
few extra revs, the bike pulls smoothly and strongly away.
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Works
Kayaba shock has all the trick parts, including hard-anodized innards
and bi-metal valving. A closer look will reveal extra section welded
on the stock pegs.
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A few tentative trips through the
gears reveals outrageous acceleration! This sumbitch pulls hard, and it pulls
long in each gear. You can easily torque the front end off the ground, without
tugging on the bars, or going through any gymnastics. Just goose the gas.
Instant wheelie!
When the first turn comes up, you
realize that this bike takes its time turning, unless you push the front end
down and whack the throttle, forcing it to power turn. All things considered,
Campbell's bike is much happier and more comfortable on high-speed turns. On
slippery, no-traction surfaces, the bike was as close to pure magic as you're
ever going to find.
I found myself shifting up a gear on
big sweepers, and rolling the throttle on gently, hanging the rear end out just
a bit, and feeling much like a fat flat-tracker. Lottsa fun.
Jumps. Hmmm. Here, I could feel the
weight when landing, but the high-bucks suspension did a great job. The course
we rode on had a few double jumps, and I avoided all the ones you could get hurt
on. A little 30-footer was easy, and the bike felt like a 250 Mxer, until I
over-jumped it and landed on the flat stuff. Then, the weight lets itself be
known and the G-out was no fun.
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Air
box has been opened up plenty and a K & N filter hides under the
plastic.
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Suspension-wise, the bike took the
bumps in stride, mostly ignoring the smaller ones. There's something to be
said about a heavy bike with a great suspension: The bike doesn't move when a
small bump is hit, and the suspension does all the work.
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Mufflers
are light, small and delightfully barky. There's noise and there's
music; this was a symphony of sound.
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Where does it fall short?
When the bike has to slam down hard on
either end, it's no fun. Go through a set of rockers and lose your rhythm, or
misjudge the front-end touchdown, and the entire chassis will pitch heavily and
you'll get an unfriendly jolt.
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Ohlins
steering damper is adjustable for the terrain. Answer tapered bars
replace the weak stockers. Dry brake filler is installed on the Big
IMX tank for quick re-fueling. Tanks vents into steering head tube.
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However, overall stability is superb.
Out track had a long very bumpy downhill in it, and the Baja bike simply ate
this whooped-out section of real estate alive. All you had to do was keep the
gas on and simply trust the inherent stability of the bike.
When watching Campbell come down this
nasty hill at speed, it looked like he was way over his head, but he did the
banzai charge lap after lap, and later told us he was simply cruising.
This emboldened your writer to try
this. So I went out and screamed down the hill and did not die, which surprised
me a lot. Johnny's bike responded well to lots of throttle, and if you have
the nerve to simply hang on and trust the bike, it will reward you with speeds
beyond your normal skills.
BITS AND PIECES
- Brakes. Typical Honda. Excellent.
- Shifting. Not as smooth as a CR,
but better than the older generation XR 600s.
- Clutch. Solid and smooth.
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Campbell
and his Honda crew can tell the oil level at a glance with this
external view line setup.
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- Ergonomics. Nothing got in the way
when you moved around on the bike. Layout was natural and controls felt
right.
- Vibration. Low. Bike is not tiring
to ride.
- Grips are first rate stock Hondas.
- IMS tank did not bother my chubby
thighs when riding, so your thighs should be just fine.
- I loved the smell of the race gas!
- Cracks were developing in the
stainless steel exhaust twin pipe system. They should have brazed the
flanges, rather than heli-arced them.
- Suspension was on the firm side.
THE BOTTOM LINE
Probably the most amazing thing about
Campbell's Baja winning bike, is that it's not that much removed from a
stock XR650R. Sure, they've pumped a bit more HP into the engine, but a
stocker (with cleaned up jetting) can easily be geared to 104-105 mph, which
should be enough to satisfy all but overall Baja winners.
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Da
good stuff! Genuine works KYB forks eat the bumps, and no, you cannot
afford a set.
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As for the trick suspension, quite
frankly, it didn't seem all that much better than the stock stuff. No doubt,
there are plenty of local shops around who will be able to dial your suspension
in for you, if you're fussy.
Me? I think the stock suspension is
just fine for trail riding and casual racing.
You could probably duplicate (by and
large) what Johnny Campbell rode to victory in the Baja 1000 for a few thousand
bucks .
All you would need to beat him at his
own game, would be some juevos grande to let you travel at the speeds he does
… and then some.
But the basic bike is yours for the
asking.
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