Honda CRF450R User Manual

FRAME Remarks
Shock spring
Standard
Stiffer
Optional
Softer
Stiffer
Fork spring
Standard
Optional
Softer
The standard fork spring and shock spring
mounted on the motorcycle when it leaves the
factory are not marked. Before replacing the
springs, be sure to mark them so they can be
distinguished from other optional springs.
308.0 lbf/in (5.50 kgf/mm)
No mark
(factory products)
Red
paint
(aftermarket parts)
or
296.8 lbf/in (5.30 kgf/mm)
25.76 lbf/in (0.46 kgf/mm)
24.64 lbf/in (0.44 kgf/mm)
26.88 lbf/in (0.48 kgf/mm)
Jet needle number
(1/2 clip position
leaner than
standard series,
leaner only at 1/8
to 3/4 throttle)
NGJN
Ø2.725 mm
NGJP
Ø2.735 mm
NGJQ
Ø2.745 mm
NGJR
Ø2.755 mm
NGGN
Ø2.725 mm
NGGP
Ø2.735 mm
(standard needle)
NGGQ
Ø2.745 mm
NGGR
Ø2.755 mm
NGGS
Ø2.765 mm
NGJS
Ø2.765 mm
CARBURETOR Remarks
Main jet
(Standard: #168)
Slow jet
(Standard: #42)
#158 – #178 (in increments of
2 or 3)
#38 – #48
(in increments of 2 or 3)
Jet Needles
Standard needle: NGGQ
Straight diameter: ø2.745 mm
Jet needle number
(standard series)
TOOLS Remarks
FRAME Remarks
Driven sprocket
Standard
< >: Drive chain links
48 Teeth, Aluminum.
<114>
20 inch
• wheel assembly
(except brake disk)
• tire tube
• tire flap
• rim lock (bead stopper)
• front tire
(90/100-20, 90/100-20 M/C)
Fork height: 0 in (0 mm)
(align the top of the fork tube
with the top of the upper clamp)
Optional
Optional
Optional
47 Teeth, Aluminum
<114>
49 Teeth, Aluminum
<114>
Handlebar
lower holder
Standard 3 mm offset
no offset
Front wheel
Standard
21 inch
Fork height: 0.3 in (7.0 mm)
(align the index groove with the
top of the upper clamp)
Pin spanner A
Workstand
To adjust spring preload.
(two spanners required)
For maintenance
General flow characteristics
Leaner Richer
(at 1/16 to 1/4 throttle)
168
Red
Blue
319.2 lbf/in (5.70 kgf/mm)
330.4 lbf/in (5.90 kgf/mm)
Pink
Silver
These parts and tools may be ordered from your
authorized Honda dealer.
60.61 mm60.16 mm
2 scribe marks
(aftermarket parts)
3 scribe marks
Size
Jet needle number
Straight diameter (2.745 mm)
4 scribe marks
Technical Information 151
Optional Parts List

Honda CRF450R Specifications

General

Brand	Honda
Model	CRF450R
Category	Motorcycle
Language	English