Honda NC700 2012 User Manual

10-22
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CYLINDER HEAD/VALVES
VALVE SEAT INSPECTION/REFACING
Clean the intake and exhaust valves thoroughly to
remove carbon deposits.
Apply a light coating of Prussian Blue to the valve
seats.
Tap the valves and seats using a rubber hose or other
hand-lapping tool [1].
Remove the valve and inspect the valve seat face.
The valve seat contact should be within the specified
width and even all around the circumference.
If the seat width is not within specification, reface the
valve seat (page 10-23).
Inspect the valve seat face for:
• Uneven seat width:
– Replace the valve and reface the valve seat.
• Damaged face:
– Replace the valve and reface the valve seat.
The valves cannot be ground.
If a valve face is burned or badly worn or if it contacts
the seat unevenly, replace the valve.
• Contact area (too high or too low)
– Reface the valve seat.
[1]
STANDARD:
IN: 0.90 – 1.10 mm (0.035 – 0.043 in)
EX: 1.30 – 1.50 mm (0.051 – 0.059 in)
SERVICE LIMITS:
IN: 1.5 mm (0.06 in)
EX: 1.9 mm (0.07 in)
SEAT WIDTH

Honda NC700 2012 Specifications

General

Engine Type	670cc liquid-cooled parallel-twin
Bore x Stroke	73.0mm x 80.0mm
Compression Ratio	10.7:1
Front Brake	Single 320mm disc with two-piston caliper
Rear Brake	Single 240mm disc with single-piston caliper
Fuel Capacity	3.7 gallons
Fuel System	PGM-FI
Transmission	6-speed
Front Suspension	41mm telescopic fork
Rear Suspension	Pro-Link single shock
Front Tire	120/70-17
Rear Tire	160/60-17
Wheelbase	60.6 inches
Curb Weight	472 pounds