2007 Yamaha YZ450F

New 2007 Yamaha Dirt Bikes

Sep. 01, 2006 By ORC STAFF
New Features and Refinements
2007 Yamaha YZ450F
  Key Features:
  • Modifications to the light and strong aluminum frame and suspension mean light, precise, confident handling at any speed.
  • Five-speed gearbox provides maximum flexibility and the right gear for a wide range of riding environments.
  • Ready to race straight out of the crate - with a ProTaper aluminum handlebar in adjustable clamps, titanium shock spring, ti footpegs, gripper seat, etc.
 New for 2007:
  • Replacing the upper cast triple clamp with a light and strong forging, slightly reducing steering head rigidity, and the use of lighter outer fork tubes; lighter wheel rims and light wave-type brake rotors add up to super-accurate, super-responsive steering.
  • Increasing the length of the rear shock by 1.5mm further sharpens handling. Replacing steel damping adjusters with aluminum ones removes even more weight from the four-way adjustable, titanium-sprung rear suspension unit.
  • A more rigid clutch pressure plate helps put power to the ground and dissipates heat more efficiently, especially during partial-clutch operation. Shorter lever stroke with 12-percent reduced effort means instant response.
  • New, titanium exhaust pipe fattens low- and mid-range power while simultaneously adhering to 2007 AMA noise regulations.
  • This year's ProTaper aluminum handlebar bend raises the grips 8mm for an expanded cockpit. Forged bar clamps reduce weight for superior handling.
  • 449cc five-valve DOHC liquid-cooled engine is super-powerful yet tractable.
  • 39mm Keihin FCR flat-slide carburetor with throttle position sensor (TPS) and leak jet delivers precise fuel/air mixture and instant throttle response.
  • Revised CDI ignition keeps that amazingly broad and deep powerband hard-hitting, yet controllable.
  • Lightweight, titanium valves and load-reduced springs minimize reciprocating mass for fast-revving, hard-hitting power delivery across the rev range.
  • Additional weight-saving engine features include: small-design cam chain tensioner and oil pump, aluminum oil hose, all-titanium exhaust header, flange, bracket and heat shield and light CDI ignition unit.
  • Primary kickstarting with automatic decompression and convenient handlebar-mounted hot start lever ensures easy restarts.
  • Kick pinion gear is separate from the primary driven gear for smoother clutch engagement.
  • Large-capacity radiator is reinforced for greater strength.
  • Aluminum frame uses a mix of alloy casting, forgings and extrusions to produce a tuned-flex frame that makes the YZ the finest handling motocross bike ever.
  • Speed-Sensitive System 48mm Kayaba fork places transfer control valves (TCV) above the fork springs, so that damping force is controlled by piston speed; Eliminating mid-stroke damping force changes provides a smoother, more precise ride.
  • Titanium-sprung four-way adjustable rear shock with Kashina-coated internals reduces friction for fantastic compliance and great handling.
  • More weight savings come via two-piece (part aluminum, part plastic) engine protector plates and thin-walled engine guard construction.
  • Removable aluminum rear subframe constructed of square-section tubing for light weight and easy maintenance - lighter fasteners for 2007 enhance weight distribution and handling.
  • Lightweight front wheel hub for reduced unsprung weight and increased durability.
  • Premium Dunlop knobbies provide unbeatable, competition-spec traction and great wear.
  • Lightweight 21-inch front and 19-inch rear Excel rims are exceptionally durable and reduce unsprung weight.
 Additional Features:
  • “Gripper” style seat cover gives excellent feel and control, and the seat is lighter for 2007.
  • Wide, cleated, folding titanium footpegs are light, strong, and provide excellent comfort, grip and ground clearance.
  • Works-style clutch lever features oversize barrel adjuster for easy, on-the-fly adjustability of lever/cable play.
  • Cleated rear brake lever and folding shift lever tip offer superb grip and excellent durability.
  • Repackable exhaust silencer.
  • Durable, comfortable handlebar grips.
Stainless steel clutch cable for longer life.

2007 YZ450F
Engine Type 449cc, liquid-cooled, 4-stroke, DOHC, 5-valve
Bore and Stroke 95 x 63.4mm
Compression Ratio 12.3:1
Carburetion FCR-MX39 x 1
Fuel System MikuniTM VM12
Ignition Digital CDI
Transmission Constant mesh 5-speed/Wet, multiple-disc
Final Drive Chain Drive
Front Suspension Telescopic Fork, coil spring/oil damper, 11.8" Travel
Rear Suspension Swingarm (link, suspension), coil spring/gas-oil damper, 12.4" Travel
Front Brake Hydraulic single disc brake, 250mm
Rear Brake Hydraulic single disc brake, 245mm
Front Tire 80/100-21-51M
Rear Tire 110/90-19-62M
Overall Length 86.3"
Overall Width 32.5"
Overall Height 51.4"
Seat Height 38.9"
Ground Clearance 14.7"
Wheelbase 58.8"
Dry Weight 220 lb
Fuel Capacity 1.8 gal.
Other Main Jet #160
Main Air Jet #200
Jet Needle NFLR-4
Needle Jet N/A
Pilot Air Jet 1 #100
Pilot Outlet 0.9
Pilot Jet #45
Primary Reduction Ratio 61/23 (2.652)
Secondary Reduction Ratio 49/13 (3.769)
Gear Ratio - 1st Gear 27/14 (1.929)
Gear Ratio - 2nd Gear 23/15 (1.533)
Gear Ratio - 3rd Gear 23/18 (1.278)
Gear Ratio - 4th Gear 24/22 (1.091)
Gear Ratio - 5th Gear 20/21 (0.952)
Warranty 30 Day (Limited Factory Warranty)
MSRP*$6,999 (Team Yamaha Blue/White) Available from September 2006
$7,099 (White/Silver) Available from September 2006

Off-Road.com Newsletter
Join our Weekly Newsletter to get the latest off-road news, reviews, events, and alerts!