Ignition Timing - Buell 2007 FIREBOLT Service Manual

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IGNITION TIMING

INSPECTION
Check ignition timing:
After each removal of the cam position sensor.
CHECKING STATIC TIMING
1
CAUTION
Always wear proper eye protection when drilling. Flying
debris may result in minor or moderate injury.
CAUTION
Carefully drill hole, applying minimum pressure to drill
out timer plate cover rivets. Applying too much pressure
will damage cam position sensor and/or timer plate and
cover.
NOTES
It is not necessary to remove the spark plug to determine
TDC compression stroke of the front cylinder in the fol-
lowing procedure.
Do not remove the timing inspection cover to check the
static timing. If timing must be corrected, the inspection
plate will then be removed.
1. Raise rear wheel using a lift or jacking point. Tie down
motorcycle for additional support.
8351
Figure 1-49. Timing Inspection Plug
2. See Figure 1-49. Remove timing inspection plug.
3. Place transmission in 5th gear.
4. Connect Digital Technician to data port on motorcycle
and select the Static Timing procedure screen.
5. Turn on ignition and move handlebar stop switch to the
run position. Listen for fuel pump cycling to confirm igni-
tion is active.
6. Turn or gently bump the flywheel in a forward direction
using the rear wheel. Position the flywheel TDC mark at
the very left edge of the inspection hole.
1-46 2007 Buell Firebolt: Maintenance
7. If the engine is coming up on the compression stroke for
the FRONT (correct) cylinder, the screen will be display-
ing LOW - 0 volts with timing mark at left edge of window.
8. Gently bump flywheel forward in tiny increments.
b0965x1x
Figure 1-50. Correct Timing
9. See Figure 1-50. If the static timing is correct, the screen
will switch to HIGH - 5 volts at the precise moment the
timing mark exactly centers in the inspection window.
10. If engine is coming up on the compression stroke for the
REAR (incorrect) cylinder, the screen will be displaying
HIGH - 5 volts as timing mark is just coming into view at
left edge of window and will switch to LOW - 0 volts at
same point as the timing mark continues through the
window. (If this is observed, turn flywheel forward one
revolution to bring engine to compression stroke for front
cylinder.)
NOTES
If timing mark check point is overshot, bump flywheel
backwards till TDC mark is at left edge of inspection win-
dow and repeat test bumping flywheel in forward (nor-
mal) direction.
Never confirm timing while bumping flywheel backwards.
This will give you an incorrect reading.
11. If timing is correct, install timing inspection plug and
tighten to 120-180 in-lbs (14-20 Nm). If timing is not cor-
rect, see ADJUST TIMING
1.18
in this section.