DIRT BIKE • JULY 2009 • www.dir tbikemagazine.com R R A A D D I I C C A A L L R R I I D D I I N N G G T T I I P P S S : : T T H H E E Y Y W WI I L L L L C C H H A A N N G G E E Y Y O O U U R R L L I I F F E E ! ! ALL-NEW 4-STROKE FIX ALL-NEW 4-STROKE FIX COOL GEAR & TIPS COOL GEAR & TIPS CCC 02977 • • D D R R . . D D ’ ’ s s W W I I C C K K E E D D K K L L X X • • P P R R O O C C I I R R C C U U I I T T K K T T M M M M O O D D S S • • D D U U A A L L S S P P O O R R T T 6 6 5 5 0 0 s s • • B B I I G G B B O O R R E E H H O O N N D DA A C C R R F F2 2 7 7 0 0 NEVER STALL AGAIN! NEVER STALL AGAIN! www.dirtbikemagazine.com JULY 2009 Attn retailer: Please display until July 16 BUILT TO THE HILT BUILT TO THE HILT DEAL WITH THE HEAT DEAL WITH THE HEAT B BE EA A T T T TH HE E R RE EC CE E S SS SI IO ON N A AN ND D H HA A V VE E M MO OR RE E F FU UN N $4.99 DB_0709_cover_spine:Quark Pg text 5/4/09 12:02 PM Page 1
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NEVER STALL ALL AGAGAIN!IN! - Dubach Racing Developmentdirt bike • july 2009 • tbikemagazine.com rraaddiiccaall rriiddiinnggttiippss::tthheeyy wwiillll cchhaannggee yyoouurr lliiffee!!
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BUILT TO THE HILTBUILT TO THE HILT
DEAL WITH THE HEATDEAL WITH THE HEAT
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AANNDD HHAAVVEEMMOORREE FFUUNN
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JULY 2009 / DIRT BIKE 33
TTHHEE QQUUIIEETT
HHUULLKKWaking up a silent monster
W e haven’t missed a Nevada 200 trail ridein over five years. We salivate for this
ride and look forward to it for the demandingterrain that runs the gamut from fast desert tohigh-elevation mountains. With this multidayride in mind, we always put considerableeffort into building a machine for the event.This year, DR.D stole our Kawasaki KLX450and returned it in a completely different formwith the goal of a stronger power curve andsuspension that focused on flattening out theterrain of the Nevada desert a little moreeffectively than the stocker. That meant valv-ing changes for better manners at speed with-out making it a jackhammer. Our only requestwhen the bike left our possession was that wedidn’t want a loud bike. After that, they coulddo as they pleased.
The DRD KLX did it all. It was a champ through every typeof terrain at the Nevada 200, handled EnduroCross-styleriding and even dealt with natural-style motocross tracks.
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32 www.dirtbikemagazine.com
PROJECT OFF-ROAD KLX450DB
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34 www.dirtbikemagazine.com
PROJECT OFF-ROAD KLX450DB
JOLLY GREEN GIANTDR.D put focused effort into the motor mods. It received
a Wiseco high-compression piston while the head wascleaned up with minor porting work. All the smog equip-ment was removed with the use of an Applied Racingblock-off kit. A complete DR.D titanium system with a 94-dB insert handled exhaust evacuation and kept noise onthe quieter side. Stock jetting is way too lean once a stocktrail motor is allowed to breathe, so an OBEKS needle inthe third position from the top replaced the stock needle,and we went one step richer on the pilot and main jets onthe KLX.The results were impressive. Right off idle, the motor
pulled very hard and kept pulling stronger through themidrange. The top-end power was decent, but not equalto a 450 MXer. Still, this motor loved to be short-shiftedand lugged, which is perfect for trail riding and general off-road excursions. While the motor was smooth, the addedboost was very welcome when you need to lift thefront end over rocks or get on top of the sand in themany sand washes of the Nevada 200. With the richerjetting, we never flamed out in slow conditions andwere able to go from sea level up to about 7000 feetbefore experiencing any slight rich burble. We wereable to clean up that issue with the fuel screw.
DR.D took care of the motor work while Barnett handled the clutch duties. Barnett has a lifetime guarantee on its baskets andpressure plates. Decal Works took care of the graphic duties, and an IMS GP tank meant we could go hours between gasstops. A CV4 reflective sheet was used on the underside of the gas tank, while trick-looking CV4 green radiator hoses flowedcoolant. Buried in the motor and airbox was a Ready Filter air filter and oil filter.
The suspension was handled by Race Tech, whorevalved it to mimic the stock plushness and resist bot-
toming out. Because we wanted our DR.D KLXto maintain its great ability to handle
single-track rocks and roots, wechose to leave the stock springs
rather than go stiffer. Thisturned out to be a great choicewith the Race-Tech valving. It
still soaked up all
All it takes is one crash to appreciate the Sunline levers.They move in every direction, and broken levers are virtuallya thing of the past.
TTHHEE QQUUIIEETT HHUULLKK
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JULY 2009 / DIRT BIKE 35
The 94-dB DRD exhaust system was fairly quiet and added power—both good things. The Kenda meats hooked up well in softand intermediate terrain, while the Seal Savers kept us from crying the seal-leak blues. Light Speed hooked the KLX up withsteel 57mm wide footpegs. A BRP chain slider and chain guard keep the chain in line.
the small stuff but did a much better job and handled bighits without hitting the stops. A big bonus to the handlingof the KLX was the Scotts Stabilizer. Most of the time weran it on a pretty light setting, but when things got rockyand nasty, we turned it up and just hammered through
ugliness in a straight, controlled line.Galfer handled the braking duties with a 270mm over-
sized Wave rotor up front and a Wave rotor at the back,both of which were made from high-carbon stainless steel.
Galfer brake pads put the squeeze on those rotors, muchto our approval. The added power of the oversized frontrotor really came into play after many hours in the saddlewhen big downhills seemed bigger and the fingersbecame weaker.Any bike, whether it is a stocker or a tricked out
machine like the DR.D KLX, needs protection. If you don’twant to add weight, Light Speed’s carbon fiber parts arean excellent choice. The DR.D machine sported a LightSpeed skid plate, engine guard set, rear rotor guard and
A BRP triple clamp held oversized Tag bars and a ScottsStabilizer. The stabilizer is heaven-sent in fast, rocky conditions.
If anyone ever tells you Nevada isn’t rocky, he’s lying.