Honda CRF450X 2005 User Manual

CYLINDER HEADIV ALVES
Reface the se ar Use a 45° seat cutte r, r emove any r oughness or
WIth a 45~cutte, irregularities from the seat.
whenever B valve
guide is rep/aced. TOOLS:
Seat cutter, 35 mm liN)
Seat c utter , 33 mm (EX)
Cutter holder , 5.5 mm (IN)
Cutter holder , 5.0 mm (EX)
07780·0010400
07780 · 0010800
07781 ·0010101
07781- 0010400
or equivalent commercially available in U.S.A.
Use a 32 ° flat cutter, r emove 1/4 of the existing
valve seat material.
TOOLS:
Fl at cutter , 36 mm (IN)
Fl at cutter . 33 mm (EX)
Cutter holder , 5.5 mm (IN)
Cutter hold er, 5.0 mm (E X)
07780 - 0013500
01780·0012900
07781 ·0010101
07781·0010400
or equivalent commercially available in U.S.A.
Use a 60° interior cutter, remove 1/4 of the existing
valve seat material.
TOOLS:
Interior cutter, 37.5 mm (IN)
Interior c utt er, 34 mm (EX)
Cutter holder , 5.5 mm (IN)
Cutter ho lder , 5.0 mm (EX)
07780 - 0014100
07780 - 0014700
07781·0010101
07781- 0010400
or equivalent commercially available in U.S.A.
-
ROUGHNESS
/ ~ EATWIDTH
32 °~
-~~...J~ OLD
~)SEA T WIDT H
Using a 45° seat cutter, cut the seat to proper width. ~=================~
Make sure all pitting and irr eg ularit ies are removed.
9-32
Refinish if necessary.
STANDARD:
IN: 1.1 - 1 .3 mm (0.04 - 0.05 in)
E X: 1.3 - 1.5 mm (0. 05 - 0. 06 in)
,''",
-------' 45 °L
•
•

Honda CRF450X 2005 Specifications

General

Engine Type	449cc liquid-cooled single-cylinder four-stroke
Bore x Stroke	96.0mm x 62.1mm
Compression Ratio	12.0:1
Valve Train	Unicam, four-valve
Transmission	Wide-ratio five-speed
Front Brake	Single 240mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	110/100-18
Wheelbase	58.3 inches
Seat Height	37.6 inches
Fuel Capacity	1.9 gallons
Ignition	Solid-state CD with electronic advance
Final Drive	520 O-ring-sealed chain
Front Suspension	47mm inverted Showa cartridge fork with 16-position rebound and 16-position compression damping adjustability; 12.4 inches travel
Rear Suspension	Pro-Link Showa single shock with spring preload, 17-position rebound damping adjustability, and compression damping adjustment separated into low-speed (13 positions) and high-speed (3.5 turns); 12.4 inches travel
Induction	Keihin 40mm flat-slide carburetor