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31,054 Posts
Discussion Starter #1
The US 2004 YZF-R1 Press Launch is officially complete. The event was held in Borrego Springs, California at La Casa Del Zorro Resorts ( www.lacasadelzorro.com ) and the R1-forum.com was there apart of it all. A big thanks to photographer Tom Riles for spending the day with us and taking care of business, if you ever need a pro camera, Tom’s the MAN! There is plenty information and a TON of photographs in this article so ENJOY. Click here or the replies link below to view the entire thread.


31,054 Posts
Discussion Starter #2
To start things off, I’m going to write about tech specs and do some comparisons to previous model R1s. The technical focus of the 2004 R1 is: TECHNOLOGY, ENGINE PERFORMANCE, HANDLING PERFORMANCE & STYLING!


31,054 Posts
Discussion Starter #3
What’s All NEW for 2004?


• Completely redesigned short-stroke 998cc,
DOHC, 20-valve, liquid-cooled, inline 4-cylinder
engine now produces 180 horsepower at an
amazing 12,500 rpm (with Ram-Air).
• All-new, 27mm narrower fuel injection system
uses motor-driven secondary throttle valves and
32-bit ECU for super-responsive, instantaneous
power delivery.
• Two-piece ergonomically designed fuel tank
carries fuel in the rear section, for good centralization
of mass, while the front half contains a
new, Ram-Air-fed airbox for increased power.
• Re-angled cylinder head–40 degrees forward
instead of 30–optimizes weight distribution,
straightens intake tracts for improved cylinder
filling, and allows frame to pass over instead of
around the engine for great strength.
• Radical new closed-deck cylinder block reduces
cylinder pitch, allowing an engine with 3mm wider
bores to grow only 2.8mm wider instead of 12mm.
• Narrower-angle 5-valve combustion chambers
produce a highly efficient 12.3:1 compression
ratio. Bigger valves and intake cams with more
lift and duration flow more air.
• 16% lighter crankshaft, 3% lighter forged
pistons, and 9% lighter 7.5mm shorter
carburized connecting rods with perfectly mated
big ends add up to a quicker-revving engine with
excellent high-rpm durability.
• High silicon-content ceramic-composite cylinder
sleeves ensure greater heat dissipation for
consistent power delivery and reduced friction.
• Strong, yet lightweight clutch and close-ratio
6-speed gearbox with triangulated shaft layout
for increased strength, compactness, and
quicker acceleration.
• Titanium underseat exhaust system (except
for stainless steel midpipe with catalyst)
contains a new titanium EXUP valve for a broad,
seamless powerband.
• High-efficiency curved radiator and an
aluminum liquid-cooled oil cooler maintain
stable operating temperature.
• Direct ignition coils, new dual-electrode spark
plugs and high-output magneto deliver more
reliable firing.
• AC generator moves behind cylinder block for a
narrow engine with excellent cornering clearance.

• All-new, aluminum Deltabox main frame rails
pass over the engine instead of around it, resulting
in a structure that’s 200% more rigid vertically,
50% stiffer laterally, and 30% stiffer torsionally.
• Overall frame width is reduced from 464 to
395.6mm, which produces more comfortable
ergonomics as well as more efficient
aerodynamic penetration.
• All-new, Controlled Fill die cast, truss-type
swingarm is 30% stronger and long for optimal
traction and feedback.
• Front-end geometry with 5mm more fork offset
and reduced trail from 103mm to 97mm for
increased maneuverability.
• The rider is repositioned for greater comfort too:
Clip-on handlebars are 10mm higher, footpegs
are 2.5mm further forward and 7.5mm lower,
and the fuel tank is narrower.
• Controlled Fill die cast, detachable aluminum
subframe is light, strong and allows easy rear
shock access.
• Rear brake caliper is 12% lighter and rear disk
is 10 grams lighter.
• Dual 320mm front disc brakes; lighter/stronger,
forged one-piece radial-mount calipers and Brembo
radial-pump front master cylinder with adjustable
lever delivers great braking controllability.
• Fully adjustable KYB inverted telescopic front
fork gets stiffer springs, 4.7” of travel, and rigid
43mm tubes.
• Piggyback rear shock gets a stiffer spring, 5.1"
of wheel travel, full adjustability and a lightweight,
accessible aluminum preload adjustment collar.
• New, 5-spoke wheels are 10% lighter in front
and 7.5% lighter in rear for improved acceleration,
deceleration, handling and suspension action.
• Underseat titanium exhaust system is lightweight,
reduces drag, enhances mass centralization,
allows 56 degrees of cornering clearance–and
adds to R1’s predatory appearance.

• Two multi-reflector and two projector “Gatlingbeam”
headlights provide great illumination and
distinctive style.
• New instrument panel with adjustable LCD
illumination and multi-function digital gauges:
odometer, dual tripmeters, water temperature,
air temperature, full-time clock and lap timer.
Large 15,000 rpm analog tachometer with
adjustable shift light.
• Aggressive new bodywork for improved
aerodynamics with twin Ram-Air intakes for
increased engine performance.
• LED taillight is light, bright and highly efficient.
• Sticky 120/70-ZR17 and 190/50-ZR17 radial
tires for incredible grip and precise handling.
• Forged footpegs are extra durable and light.
• Extensive use of hollow bolts and lightweight
fasteners help trim overall weight.
• 8.2 AH battery is more compact and
25% lighter.
• California emission compliant.
• Durable #530 O-ring–sealed drive chain.
• Standard toolkit located in convenient storage
compartment under passenger seat.


31,054 Posts
Discussion Starter #5
I'm going to go through and picture some of the things I found interesting about the new bikes features before I start the write up. :)

Spark Plugs... New split tip for increased spark... = Cleaner and faster fuel atomization...


31,054 Posts
Discussion Starter #7
The new Hydraulic cam chain tensioner... It's oil pressure fed!:rock


31,054 Posts
Discussion Starter #9
Crank.. 16% less weight.. Fracture splitting technology is high tech for all you techno buffs.


31,054 Posts
Discussion Starter #10

* Completely new crankcase assembly and is 56mm narrower from 469mm to 413mm

*Main journal bolts are angle tightening type


* New smaller diameter clutch basket is reduced from 172mm to 154.8mm for a 5%
weight reduction

*Width is increased from 58.5mm to 63.1mm by the addition of one extra steel and friction

* Spring cushion with wire retainer for smooth clutch operation

* There are 3 different friction plates that are changed from cork to paper base for better
heat management

* Final friction plate is located differently than the rest of the clutch pack to reduce clutch

* Six coil springs replace diaphragm type clutch spring for a more positive clutch feel

* There are 3 types of damping springs in the primary driven gear. Each has a different spring rate for a progressive feel.

and the TRANNY:


31,054 Posts
Discussion Starter #11
 Forced air intake was added
 Front of the frame is used as the air intake
 Viscous type non-cleanable air filter
 Filtered side of airbox is 5.9L


31,054 Posts
Discussion Starter #12

 Electronic Fuel Injection with new style 45mm throttle bodies
 Throttle body assembly is 27.4mm narrower to accommodate chassis space
 Diaphragm slide is replaced by a servomotor operated secondary butterfly valve for
improved throttle response
 Two Throttle Position Sensors are used – one main TPS and another for the secondary
 Long nose, high dynamic range fuel injector for steep angle location and high rpm
 Self-diagnostics can be monitored and viewed through the instrument panel
 Fuel pump is mounted inside the fuel tank


 Completely new all black Deltabox frame
 Frame rigidity was substantially increased for greater stability – Vertical = +200% /
Torsional = +30% / Side = +50%
 Frame main frame rails are 68.4mm narrower than the ’03 R1


31,054 Posts
Discussion Starter #13
More on the FRAME(and the reason why the bike handles so well and feels so comfortable!):

 Engine is slanted another 10° forward from 30° to 40° and fits under frame main rails to
allow for a narrower frame.
 Footpegs are moved 2.5mm forward and 7.5mm down
 Handlebars are 10mm higher.


31,054 Posts
Discussion Starter #17
Get yourself a backpack, you'll thank me later (btw Yamaha has some nice ones :wink).. alot less room in the trunk..


31,054 Posts
Discussion Starter #18

 All new “CF Die Casting” swing arm
 Swing arm supports are on the bottom to accommodate the under-seat exhaust system
 Torsional and side rigidity are increased 30%


 New 43mm Kayaba front forks
 Internal settings are changed to match the
new chassis
 Fully adjustable preload, compression and
rebound damping
 4.72in (120mm) of travel
 Spring rate is changed from 8.5N/mm to
 Triple clamp offset is increased from
25mm to 30mm


31,054 Posts
Discussion Starter #19

 New radial mount brake calipers for superb braking taken from the GP ranks of racing
 Radial mounted brakes have their mounting brackets on the leading and trailing edges of
the brake rotor, not just the trailing edge as with traditional type brake calipers. This type
of mount virtually eliminates caliper flex
 The master cylinder is a Brembo radial pump style with a 2mm increase in piston size
for more precise brake feel
 Brake rotors are larger and thinner

(and they work incredibly, I can attest to that!!)


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