2008 Honda TRX450R

Posted on by 1

Available in manual- and electric-start versions, the mighty TRX450R has won races in virtually every ATV racing arena as well as three victories in the grueling wilds of the Baja 1000.

New for 2008
New Black/Blue color joins White and Red on the TRX450ER.


High-Performance Unicam® cylinder head design (see Technology Section)
Compact, lightweight engine designed specifically for ATV usage is worthy of its CRF® heritage.
Electric-start version features an electric starter that drives the clutch side of the crankshaft to provide superior lubrication of starter gears and to produce a narrow engine with a short, strong crankshaft.
Lightweight, compact, internal auto decompressor provides superb cold-starting and hot-starting operation.
Kickstart version incorporates ATV-type forward kickstarting for ease of starting and light weight.
Crankshaft is made of high-strength, low-carbon steel with carburized main journals for maximum durability at sustained high-rpm operation.
Cylinder-head cover is made of magnesium to reduce engine weight.
Forged three-ring 12.0:1 compression slipper piston is lighter than a conventional design, revving quickly while maintaining excellent cylinder sealing and high-rpm power.
Maximum engine rpm is 9850.
Double-carburized connecting rod utilizes a big-end needle bearing for maximum high-rpm performance and durability.
Nikasil cylinder lining is lightweight and provides cooler and quieter operation for extended engine life.
Press-fitted steel spark plug pipe fits between forked exhaust rocker arms, further contributing to compact cylinder-head design.
40mm Keihin FCR-type carburetor features four rollers on the flat slide, resulting in very light throttle effort, smooth operation, crisp throttle response and excellent rideability.
Carburetor features a throttle position sensor (TPS) that helps maintain linear response throughout the rpm range.
Twin-sump lubrication system separates the oil supply for the crankshaft, piston and valve train from the clutch and transmission. This ensures a cool supply of oil to the clutch, eliminates clutch and transmission material contamination to the engine oil and reduces the amount of circulating oil and the required size of the oil pump.
Vertically split crankcases feature a built-in oil pump, reducing weight compared to a conventional design.
Left-side countershaft bearing and axle carrier feature double-row bearings for added durability.
Exhaust system uses a lightweight, stainless steel header and muffler.
Exhaust system and free-flowing muffler increase performance while maintaining low noise levels.
Radiator is lighter weight and has revised fin pitch for improved airflow in all riding conditions.
Compact, flat radiator fan is lightweight and provides efficient cooling.
Gear-driven balancer reduces vibration and drives the water pump. Eight clutch plates provide the surface area necessary to handle the engine’s massive torque.
Durable five-speed transmission with low ratios designed to match engine power characteristics.
Transmission ratios designed for racing applications and trail use.

Rider’s position features low handlebar, seat and footpegs for improved center of gravity and rider feel.
Round-tube steel frame with removable aluminum subframe is lightweight and durable.
One-piece, cast-aluminum swingarm for light weight, maximum strength and durability.
Independent, double-wishbone, double A-arm front suspension with fully adjustable Showa shocks provide 8.4 inches of travel, and features rear-facing reservoirs for increased durability.
Pro-Link® Rear Suspension (see Technology Section) with fully adjustable Showa piggyback shock provides 9.3 inches of travel.
Dual 174mm front disc brakes with twin-piston calipers and high-pressure front brake lines provide excellent stopping power.
190mm rear disc and beefy single-piston caliper provide improved stopping power and increased ground clearance.
Aluminum brake calipers and brackets front and rear reduce weight.
Removable aluminum rear grabrail and front bumper for reduced weight.
Lightweight aluminum wheels reduce unsprung weight for outstanding handling.
Dunlop radial tires provide superb traction and cornering ability.
Durable and lightweight O-ring-sealed drive chain.

Additional Features
Throttle lever and carburetor feature full-closed detection system.
Engine design meets California Air Resources Board (CARB) off-road emissions standards.
Convenient oil-level window allows for at-a-glance oil check.
Long, narrow seat is designed for superior comfort and performance in all operating conditions. Saddle is also easy to remove for convenient access to the air filter.
Large air filter allows maximum airflow for optimum engine power.
Airbox designed for improved airflow and increased power.
Adjustable dual headlights with 30-watt bulbs and improved reflectors for excellent visibility and distinctive appearance.
Headlight shape for race-derived look.
Pivot-access brake calipers for easy pad replacement.
Engine cases protected by high-impact plastic skidplate.
LED tail/brakelight to shed weight and add an aggressive appearance.
CRF-style clutch and front brake lever.
Wide footpegs for improved rider control.
Aluminum shift and brake pedals.
CRF-type handlebar grips.
Honda Racing-inspired colors and graphics.
Optional HRC Racing Kit available.
Transferable one-year limited warranty; extended coverage available with a Honda Protection Plan.


Honda TRX450R

Model:  TRX450R (kick start) / TRX450ER (electric start)
450cc liquid-cooled single-cylinder four-stroke
Bore and Stroke: 96mm x 62mm
Compression Ration: 12.0:1
Valve Train: Unicam; four-valve; 36mm intake, Ti (TRX450R); 30mm exhaust, steel (TRX450ER)
Induction: Keihin 40mm flat slide carburetor with throttle position sensor (TPS)
Ignition: CD with electronic advance
Starter: Electric or forward kick
Transmission: Five-speed
Final Drive: O-ring-sealed chain


  • Front: Independent double-wishbone with Showa shocks, featuring adjustable spring preload, rebound and compression damping; 8.4 inches travel
  • Rear: Pro-Link with single Showa shock featuring adjustable spring preload, rebound and compression damping; 9.3 inches of travel


  • Front: Dual hydraulic 174mm discs with twin-piston calipers
  • Rear: Single hydraulic 190mm disc with single-piston caliper


  • Front: 22 x 7-10 knobby radial
  • Rear: 20 x 10-9 knobby radial

Length: 73.3 inches
Width: 46.3 inches
Height: 43.3 inches
Seat Height: 32.8 inches
Ground Clearance: 4.4 inches
Wheelbase: 50.2 inches
Fuel Capacity: 2.7 gallons, including 0.8-gallon reserve
Colors: Red
MSRP: $6,849.00
Consult owner’s manual for optional HRC Racing Kit parts.
For highly experienced riders 16 years of age and older.

First impression

This is a proud looking bike with nice lines and plenty of grunt. It is clearly the best 450 out there. It has great throttle response with smooth shifting, plenty of power to spare and takes nothing to get the front tires off the ground!!

It’s just amazing! This atv has arm ripping power and it is extremely comfortable (when adjusted to your proper weight) so you can ride it for hours and not feel beat-up. This atv will beat every 450 out there. It is very fast and accelerates very quickly. It will never ever seem too slow for anyone. A very nice ride, easy to throw around and brakes well at high speeds.

Overall this atv is the best. An outstanding fourwheeler and a great buy. I would definitely recommend it to anyone currently in the market for an ATV.


hey im 14 and i just got an 04 honda 400ex with itp tires and rims and a blindstar bumper and grab bar and fly handlebars. do any of you boys have some tips for me to soup her up a lil bit?

*Registration is required to post in this forum

Back to top