IIIlUl
SERVICE AND ADJUSTMENT
CARBURETOR
NOTE: A dirty Air Cleaner will cause the Engine to run rough. Be sure Air Cleaner is clean before adjustments_ Factory settings are satisfactory for most applications
and conditions, if adjustments are needed, proceed as follows:
Never attempt to change maximum Engine speed. This is preset at the fa,ctory and should only be changed by a qualified service technician who has the necessary equipment. The Carburetor mixture may need
MIXTURE ADJUSTMENT
. Turn Needle Valve (Fig. 33) clockwise (('_1)until it just
closes. Valve may be damaged by turning Needle Valve in too far,
•Open Needle Valve
•Start the Engine,. Allow Engine to warm up for about 5 minutes before proceeding,,
. Place Throttle Control in "iDLE" position,
•Turn Needle Valve in until Engine slows (clockwise
THROTTLE THROTTLE
LINKAGE STOP
*Next turn Needle Valve out past smoothoperatingpoint until Engine runs unevenly (counterclockwise(F'_)rich mixture).
,Now turn Needle Valve to the midpoint between rich and lean so the Engine runs smoothly_
IDLE RPM ADJUSTMENT
•To adjust Idle RPM, Rotate Throttle Linkage counter- clockwise (V'_,)and hold against stop while adjusting Idle Speed Adjusting Screw to obtain 1750 RPM. Re- lease Throttle Linkage,,
CHECKING ADJUSTMENT
. Test the Engine by tilling,If Engine dies out, it usually indicates that the mixture is slightly lean and it may be necessary to turn the Needle Valve counterclockwise (_"_,) slightly to provide a richer mixture,. This richer mixture may cause a slight unevenness in idling..
THROTTLE CONTROL CABLE ADJUSTMENT
CAUTION; NEVER TAMPER WITH THE ENGINE GOV- ERNOR, WHICH IS FACTORY SET FOR PROPER ENGINE SPEED°
• Loosen Throttle Cable Adjusting Screw.
. With Throttle Control in "FAST" position and Cable con- nected to Bellcrank, pull Cable backward through Screw until Bellcrank is as far rearward as it will go.
, Tighten Adjusting Screw
MUFFLER | ;PARK PLUG |
| WIRE |
IDLE SPEED NEEDLE
ADJUSTING VALVE
SCREW
THROTTLE
CABLE
ADJUSTING
SCREW
9ELLCRANK
FIGURE 33
2O
