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I
SERVICE AND ADJUSTMENTS
I
BLADE CARE
• For bestresultsmower blades mustbe keptsharp.
the bladescan be sharpenedwith a few strokesofa
file or on a grindingwheel. Do not attemptto
sharpenwhile blades are on mower.
• To remove blade for sharpening,usewooden block
to hold blade whileremovingthe blade mounting
nut. The nuts have right handthreads. (See Fig. 7)
CAUTION: I
Do not handle mower blades with bare
hands, Careless or improper handling
may result in serious injury,
WOOD BLOCK NUT---..-_
BLADE
FIG. 7
• When grinding,take care to maintain blade balance.
Check blade for properbalance before reinstalling
to mower.
• To check and balanceblade use a balancing
machine orfixture as shownin figure 8. File
material oft heavier end of blade until itis balanced.
,_,ON NAIL. DO NOT LET BLADE TOUCH___ -_"
-BENCH. A BALANCED BLADE WILL _._
_REMA[N LEVEL. I
_ '\ NAiL LUBRICATED
WORKBENCH ,WITH DROP OF OIL
FIG. 8
To a sa[isfacto_¥ _=ration,we recommend that
you (_ ,_dold ...ad .s _, d _eplacethem with new ones
before the start of each mowing season.
NOTE: Check nuts and bladesoccasionallyto make
surenuts are tight.
I 4_11 CAUTION: I
Shut off mower engine and remove spark I
plug wire from spark plug before making I
any adjustments or repairs to mower. I
CARBURETOR ADJUSTMENTS
The manufacturer of the equipmenton
which this engine isinstalledspecifiestop
speed at whichthe enginewillbe operated.
DO NOT EXCEED thisspeed.
Differencesin fuel, temperature, altitude or loadmay
requireminor carburetor adjustment. Air Cleaner and
air cleaner cover mustbe assembledto carburetor
before starting engine.
The carburetor on thisengine is low emission, it is
equipped with and idle mixture valve with a limiter (see
inset), which allows some adjustment, and an idle speed
edjustment screw.
ADJUSTMENTS
Start engine and warm up approximately5 minutes
before adjusting. With engine running,placethrottle
controlin SLOW position. Rotate carburetor throttle
lever againstthe idle speedscrewand holdit. Turn idle
speedscrewto obtain 1750 rpm.
Rotate idle mixture valve fulltravel clockwiseandthen
counter clockwise. Finally, positionidle mixture valve in
middle of travel. Check idlespeed and re-adjustto
1750 rpm, if necessary.
Move throttle controlto FAST position, Engine should
accelerate smoothly. If itdoes not, adjustIdle mixture
valve countemlockwise1/8 turn.
CARBUR_OR
THF_O_LE
LEVER
_DLE SPEEO
SCREW
IDLE MLXTURE
VALVE
WITH LiMITER
Carburetor adjustments
18
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