Craftsman 917.271630 Owner's Manual page 26

ENGINE
Maintenance, repair, or replacement of the
emission control devices end systems, which
are being done at the customersexpense,
may be performed by any non-road engine
repair establishmentor individual.Warrenty
repairs must be performed by an authonzed
engine menufacturer's sennce outlet.
TO ADJUST THROTTLE CONTROL
CABLE
The throttlecontrol has been preset at the
factory and adjustmentshould not be
necessa_ Check adjustmentas described
below before looseningcable. If adjustment
is necessary,proceed as follows:
1. With engine not running, move throt_
controllever from slow to choke position.
Slowly move lever from choke to fast
position.
2. Check that holes "A" in governor control
lever and hole in governor plate line-up.
If holes "A" are not aJigned, loosen clamp
screw end mOve throttle cable until holes
are aligned. Tighten clamp screw
Securely.
Governor Governor
_ Plate
Holes "A" _'_ _ Clam_ qL_(K_J T hrottle
TO ADJUST CARBURETOR
NOTE: The carburetoron this engine is low
emission. It is equipped with an idle fuel
adjustingneedle with a limitercap, which
allows some adjus_ent within the limits
allowedby the cap. Do not attempt to remove
the lim'rter c ap. The limitercop cannot be
removed without breaking the adjusting
needle.
The carburetorhas been preset at the factory
and adjustment should not be necessary.
However, minor adjustment may be required
to compensate for differences in fuel,
temperature, altitude or load. If the carburetor
does need adjustment, proceed as follows:
In general, tuming idle mixture valve In
(clockwise) decreases the supply of fuel to
the engine givinga leaner fueVair mixture.
Turning the idle mixture valve out (counter-
clockwise) increases the supply of fuel to the
engine giving a richerfueVair mixture.
IMPORTANT:Damageto theneedlevalve
end the seatin carburetormayresult ifscrew
isturned in too_ght.
PRELIMINARY SETI'ING*
1. Aircleanerassembly mustbe assembled
to the carburetor w henmakJng c arburetor
adjustments.
2. Be surethe throttlecontrol cableis
a_ustedproperly (see above).
FINALSET-rING-
1. Startengine and allowtowarmforfive
minutes.Makefinaladjustments with
enginerunning and shifl/rnotion c ontrd
leverin neutral ( N')pos_on.
2. MovethrottlecontrollevertosJow
position. With finger,rotate and hold
throttlelever against i dlespeedscrew.
Turnidle speedscrewto attain1750
RPM.
3. Wnilestillholding throttleleveragainst
idlespeedscrew,turn idle mixture valve
full travel c lockwise t hencounterclock-
wiseuntil e ngineruns rough.Turnvaive
to a point midwaybetweenthosetwo
positions. R elease throttlelever.
ACCELERATION TEST -
4. Movethrottlecontrol lever from slowto
fastposition. I f engine hesitates or dies,
turn idle mixture valveOut(counterclock-
wise)1/8turn. Repeattestand continue
toadjust,ifneceesen/, u ntilengine
accelerates smoothly.
High speedstopisfactory adjusted.Do not
adjust - damagemay result.
IMPORTANT:Nevertamperwiththe engins
governor, whichisfactory set for proper
enginespeed. Overspesdingthe engine
abovethefacton] highspeedesttingcanbe
dangerous. Ifyouthink the engine-geverned
highspeedne_s adjusting, contact a
Sears or other quatifiedservicecenter,
whichhas properequipmentand experience
to makeanynecessary adjustments.
Idle S
Throttle
With Limiter
26