© 2009 ICS, Blount Inc.
F/N 70944 Oct 09
TITLE
633GC / 633F4 OPERATOR’S MANUAL
22
SPARK PLUG
• A worn or fouled spark plug can cause a loss of power,
difficulty starting or rough idle (Figure 3).
• If the spark plug is dirty, clean it with a wire brush and check
the electrode gap. Readjust if necessary.
The correct gap is .020” (0.50mm).
• The spark plug should be replaced after 40 hours of operation
or earlier if the electrode is badly corroded.
• Always use the recommended spark plug type. Using the
wrong spark plug can severely damage the piston and cylinder
(Champion RCJ7Y).
Figure 3
MAINTENANCE
DRIVE SPROCKET INSTALLATION
• Slide the rim sprocket onto the splined adapter, either side out.
• Apply a liberal amount of grease to the needle bearing.
• Place the thin metal washer onto drive shaft. Slide the needle
bearing and clutch cup w/rim sprocket onto shaft (Figure 1).
• Install the clutch by turning it counter clockwise on the drive
shaft and firmly tighten. Replace the clutch slurry shield.
Installation of drive sprocket assembly is now complete.
• The needle bearing on the drive shaft has to be greased
regularly (daily). Use high quality water-resistant bearing
grease.
• Bearing Tip: It is not necessary to remove the clutch cup to
grease the bearing. There is a channel that goes directly from
the drive shaft to the bearing (Figure 2). Simply inject grease
directly into the end of the drive shaft.
Figure 1
Figure 2
Grease hole
