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Copyright © 2005 ICS, Blount Inc.
633GC SHOP MANUAL
23.6 Start the saw and warm up the
engine.
NOTE:
The side cover must be held
tightly in place with the side
cover nuts, using a bar and no
chain. Failure to do so may result
in personal injury.
23.7 With a tachometer check the saw
rpm, with no bar and chain:
A Idle = 3,000
± 300 rpm
If the idle rpm does not fall into this
range, adjust the T screw slowly.
23.8 With a tachometer check the saw full
throttle rpm, with no bar and chain:
A Target = 11,500
± 300 rpm
23.9 If the full throttle rpm falls below this
range, turn the H screw in (clockwise)
1/16
th
of a turn at a time.
A Pulse the throttle to help stabilize the
system.
Do not hold the saw at maximum
rpm for more than 5 seconds.
23.10 If the full throttle rpm falls above
this range, turn the H screw out
(counterclockwise) 1/16
th
of a turn at
a time.
A Pulse the throttle to help stabilize the
system.
Do not hold the saw at maximum
rpm for more than 5 seconds.
23. CARBURETOR TUNING
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