Yamaha YZF-R1 Service Manual

– 5 –
Measuring the volume of the cylinder head combustion chamber
TIP
To obtain the highest performance for race use, the four cylinders should be uniform. If
you modify the head cylinder, always measure the combustion chamber volume and do
the work based on the measured value.
Measure the volume of the combustion chamber of the cylinder head (commonly called the
dome volume) as follows.
Measuring equipment
1. Burette
2. Glass plate
3. Oil (3:1 mixture of torque converter oil and white gasoline)
4. Vaseline (to seal the valve and glass plate)
Measurement method
1. Tighten a regulation spark plug to the regulation torque in the cylinder head to be
measured.
2. Set so that the alignment surface of the combustion chamber is level.
3. Apply a thin coat of Vaseline to the valve face and set the IN and EX valves.
4. Apply a thin coat of Vaseline to the combustion chamber alignment surface and set the
glass plate.
5. Add drops of oil from the burette. The total added amount is the volume of the cylinder head
combustion chamber.

Yamaha YZF-R1 Specifications

General

Bore x Stroke	79.0mm x 50.9mm
Compression Ratio	13.0:1
Fuel System	Fuel injection with YCC-T and YCC-I
Final Drive	Chain
Front Tire	120/70ZR17
Rear Tire	190/55ZR17
Wheelbase	55.3 in
Fuel Capacity	4.5 gal
Curb Weight	448 lb
Width	27.2 in
Ground Clearance	5.1 in
Engine Type	Liquid-cooled inline 4-cylinder; DOHC, 4 valves per cylinder
Transmission	6-speed
Clutch	Multiplate slipper clutch
Front Suspension	43mm KYB® inverted fork; fully adjustable
Rear Suspension	KYB® single shock; fully adjustable
Front Brakes	Dual 320mm hydraulic disc; ABS
Rear Brakes	220mm hydraulic disc; ABS