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F/N 71537 Oct 07 © 2007 ICS, Blount Inc.
TITLE613GC SERVICE MANUAL
69
23. CARBURETOR TUNING
23.3 Using a 5/64” straight blade
screwdriver, gently turn the
adjustmentscrewsclockwiseuntil
completely closed.
23.4 Settheadjustmentscrewsatthe
Basic Setting:
H = 1 3/4 turns from closed
L = 1 1/4 turns from closed
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
inpersonalinjury.
23.5 Start the saw and warm up the
engine.
23.6 With a tachometer check the saw
rpm, with no bar and chain:
A Idle = 3,000 ± 300 rpm
B If the idle rpm does not fall into this
rang,adjusttheTscrew,clockwiseto
raise RPM, counterclockwise to lower
RPM.
23.7 With a tachometer check the saw full
throttle rpm, with no bar and chain:
A Target = 11,000 ± 500 rpm
23.8 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 max
rpm for more than 5 seconds or
cylinder damage could occur.