The importance of maintaining an air cleaner in proper condition cannot be
over-emphasized! Improper air cleaner maintenance can create engine damage which the engine manufacturer will not warrant.
CARBURETOR (Figure 22)
The carburetor has a main fuel (high speed) adjustment (J) and an idle fuel adjustment (K). The main adjustment affects operation under high engine speed conditions. Idle adjustment (K) affects operation at idle or low speed conditions.
Under normal circumstances, factory carburetor adjustments should not be
disturbed. If the adjustments have been disturbed, turn the needles lightly to their
seats, then turn needles off their seats 1 to 1-1 /8 turns to permit
starting. Readjust for smooth operation. Engine idle speed is 1900 + or
- 50 RPM.
Heat shield must be removed to adjust carburetor on units so equipped.
FORCING THE NEEDLE AGAINST ITS SEAT WILL DAMAGE IT. THE NEEDLE DOES NOT COMPLETELY SHUT OFF FUEL WHEN TURNED FULLY IN.
Before final adjustment, allow the engine to warm up. Make the idle adjustment (L) under no
load. Set the engine idle speed at 1900 RPM. Open the main jet (J) until the engine runs smooth under acceleration with no
load. Slightly more fuel may be needed (open about 1/4 turn further) when sudden load is
Set the throttle stop screw (located on carburetor throttle lever) with no load connected and while running at a low speed
setting. Turn the screw to give approximately 1/32 inch (.73mm) clearance between the screw and pin at
If engine develops a "hunting" condition
(alternate increase and decrease of engine speed), try correcting by opening the main adjusting needle a little more. Do not open more than 1 /2 turn beyond the maximum point of power.