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PT / PG / PD REPAIR PG SERIES PUMPS 4<br />
4.5 Spark Plug<br />
Clean or replace spark plug as needed to ensure proper<br />
operation. Refer to the engine Operation Manual.<br />
Recommended Plug: (NGK) BPR 6ES<br />
WARNING<br />
The muffler becomes very hot during operation and<br />
remains hot for a while after stopping the engine. Do<br />
not touch the muffler while it is hot.<br />
1. Remove spark plug and inspect it.<br />
2. Replace plug if the insulator is cracked or chipped.<br />
Clean spark plug electrodes with a wire brush.<br />
3. Set gap to 0.028–0.031" (0.7–0.8 mm).<br />
4. Tighten spark plug securely.<br />
CAUTION: A loose spark plug can become very hot<br />
and may cause engine damage.<br />
4.6 Carburetor Adjustment<br />
1. Start engine and allow it to warm up to operating<br />
temperature.<br />
2. Set pilot screw (g) 2 turns out. See Note.<br />
3. With the engine idling, turn pilot screw (g) in or out to<br />
the setting that produces the highest rpm.<br />
4. After pilot screw is adjusted, turn throttle stop screw<br />
(h) to obtain the standard idle speed, 1400 ±150 rpm.<br />
Note: On some engines the pilot screw is fitted with a<br />
limiter cap (j) to prevent excessive enrichment of the airfuel<br />
mixture in order to comply with emission regulations.<br />
The mixture is set at the factory and no adjustment should<br />
be necessary. Do not attempt to remove the limiter cap.<br />
The limiter cap cannot be removed without breaking the<br />
pilot screw.<br />
j<br />
0.028–0.031 in.<br />
(0.7–0.8 mm)<br />
g<br />
1006SD37<br />
h<br />
1015SD05<br />
4-5
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