Honda CRF450R 2011 User Manual

86 Servicing Your Honda
Piston/Piston Rings/Piston Pin
3. Install the piston (3) with the “IN” mark (4)
and/or the large valve recesses (5) facing the
intake side of the engine.
4. Apply engine oil to the piston pin (6) outer
surface.
Apply engine oil to the piston outer surface and
piston pin hole inner surface.
Install the piston pin and new piston pin clips
(7).
NOTICE
Use new pin clips. Never reuse old clips.
Do not let the clips fall into the crankcase.
Do not align the piston pin clip end gap with the
piston cutout (8).
1. Clean off any gasket material from the gasket
surface of the crankcase, being careful not to
let any material fall into the crankcase.
Be careful not to remove any metal from the
gasket surface.
2. Remove the shop towels. Do not let any gasket
debris fall into the crankcase.
3. Install a new cylinder gasket (1) and dowel
pins (2).
NOTICE
Do not let the dowel pins fall into the crankcase.
(3) piston (5) large valve recesses
(4) “IN” mark
(3)
(4)
(5)
(6) piston pin (8) piston cutout
(7) piston pin clips
(8)
(6)
(7)
(6)
(7)
Cylinder Installation
(1) cylinder gasket (2) dowel pins
(1)
(2)
CRF450R.book Page 86 Thursday, July 8, 2010 9:34 AM

Honda CRF450R 2011 Specifications

General

Engine Type	449cc liquid-cooled single-cylinder four-stroke
Bore x Stroke	96.0mm x 62.1mm
Compression Ratio	12.0:1
Transmission	Close-ratio five-speed
Final Drive	#520 chain; 13T/48T
Front Brake	Single 240mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	120/80-19
Trail	114mm (4.5 inches)
Induction	PGM-FI, 46mm throttle body
Front Suspension	48mm inverted with rebound and compression damping adjustability; 12.2 inches travel
Rear Suspension	Pro-Link single shock with rebound and compression damping adjustability; 12.4 inches of travel
Wheelbase	58.7 inches
Seat Height	37.6 inches
Fuel Capacity	1.5 gallons