Gas Walk Behind Mower — service parts and specifications. Also written 917389520.
Read this before you order anything. These figures are transcribed automatically from manufacturer manuals and can be wrong. Nothing here is a fitment guarantee or professional advice.
Provided free, as is, with no warranty and no liability accepted — you use it at your own risk and on your own responsibility. Check every number against the plate on your own machine before you buy or fit a part.
Reference data — no warranty, no fitment guarantee, used at your own risk. Disclaimer
Transcribed from the manufacturer manual — not a fitment guarantee. Manufacturers supersede part numbers during a production run: check these against the plate on your own machine before ordering.
Note: some values below appear more than once in the manual without a clear label. This usually means the model changed across production years. Check your serial number plate before ordering.
Spark plug — Replace annually or every 100 operating hours. Cross-reference equivalents from other brands usually fit.
Spark plug gap — Set with a feeler gauge before installing. A wrong gap causes hard starting and rough running.
Engine oil — Grade depends on operating temperature, not on the machine. Several grades listed below are all correct — pick by season.
| Item | Value | Context | Page |
|---|---|---|---|
| Spark plug | RN4C | AE 5W-30 (BELOW 32°F) OIL CAPACITY: 20 OZS. SPARK PLUG (GAP: .030") CHAMPION RESISTOR TYPE RN4C BLADE BOLT TORQUE: 35-40 FT. LBS. • The model and … | 11 |
| Spark plug | RJ19LM4 | Valve (Std.) (Incl. 151) 130 6021A Screw, 5/16-18 x 1-1/2" 135 37598 Resistor Spark Plug (RJ19LM4) 150 31672 Valve Spring 151 31673 Valve Spdng Cap … | 21 |
| Spark plug gap | .030 | QUARTS UNLEADED REGULAR SAE 30 (ABOVE 32°F) SAE 5W-30 (BELOW 32°F) OIL CAPACITY: 20 OZS. SPARK PLUG (GAP: .030") CHAMPION RESISTOR TYPE RN4C BLADE … | 11 |
| Engine oil | SAE 30 | E OF PURCHASE GASOLINE CAPACITY/TYPE: OIL TYPE (API-SF - SJ): 1.5 QUARTS UNLEADED REGULAR SAE 30 (ABOVE 32°F) SAE 5W-30 (BELOW 32°F) OIL CAPACITY: 20 … | 11 |
| Engine oil | SAE 5W-30 | NE CAPACITY/TYPE: OIL TYPE (API-SF - SJ): 1.5 QUARTS UNLEADED REGULAR SAE 30 (ABOVE 32°F) SAE 5W-30 (BELOW 32°F) OIL CAPACITY: 20 OZS. SPARK PLUG … | 11 |
| Engine oil | 5W-30 | APACITY/TYPE: OIL TYPE (API-SF - SJ): 1.5 QUARTS UNLEADED REGULAR SAE 30 (ABOVE 32°F) SAE 5W-30 (BELOW 32°F) OIL CAPACITY: 20 OZS. SPARK PLUG (GAP … | 11 |