Measuring The Compression Pressure - Yamaha YZF-R6 Service Manual

CHECKING THE IGNITION TIMING/

MEASURING THE COMPRESSION PRESSURE

2. Install:
S timing light 1
S engine tachometer
(onto the ignition coil of cylinder #1)
Timing light
90890-03141
Engine tachometer
90793-80009
3. Check:
S ignition timing
a. Start the engine, warm it up for several min-
utes, and then let it run at the specified en-
gine idling speed.
Engine idling speed
1,250 X 1,350 r/min
b. Check that the mark a is within the required
firing range b on the pickup coil rotor.
Incorrect firing range ! Check the ignition
system.
NOTE:
The ignition timing is not adjustable.
EB303060
MEASURING THE COMPRESSION PRES-
SURE
The following procedure applies to all of the cyl-
inders.
NOTE:
Insufficient compression pressure will result in a
loss of performance.
1. Measure:
S valve clearance
Out of specification ! Adjust.
Refer to "ADJUSTING THE VALVE CLEAR-
ANCE".
2. Start the engine, warm it up for several min-
utes, and then stop it.
3. Remove:
S rider seat
S fuel tank
Refer to "SEATS" and "FUEL TANK".
S air filter case
S heat protector plate
S ignition coils
Refer to "AIR FILTER CASE AND IGNITION
COILS".
3-24
CHK
ADJ