OrphanSpecStraight answers for orphaned outdoor equipment

Craftsman 917.271100

Front Engine Lawn Tractor — service parts and specifications. Also written 917271100.

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.

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Reference data — no warranty, no fitment guarantee, used at your own risk. Disclaimer

Spark plug
RC12YC p.5
Spark plug gap
.040 p.5
Engine oil
10W30 (above) · SAE 10W30 (above) · SAE 5W30 (above) p.5, 18
Belt
850857 · 72110504 · 140294 p.49
Blade
134149 (mulching) p.49
Tire pressure
14 · 10 p.5

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.

What these parts do

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.

Belt — Belts are consumables. Length and width must match exactly — a belt that is half an inch off will throw or burn.

Blade — Sharpen or replace at the start of each season. Always balance a sharpened blade before refitting.

All values found, with sources

ItemValueContextPage
Spark plugRC12YCF/SG/SH): (above 32°F) SAE 5W30 (below 32°F) OIL CAPACITY: 4.0 PINTS SPARK PLUG: Champion RC12YC GAP: .040") GROUND SPEED FORWARD: 0-5.5 (MPH) …5
Spark plug gap.040TYPE SAE 10W30 API-SF/SG/SH): (above 32°F) SAE 5W30 (below 32°F) OIL CAPACITY: 4.0 PINTS SPARK PLUG: Champion RC12YC GAP: .040") GROUND SPEED …5
Engine oil10W30UCT SPECIFICATIONS GASOLINE 1.25GAll ONS CAPACITY UNLEADED _, NDTYPE: REGUL/_R OIL TYPE SAE 10W30 API-SF/SG/SH): (above 32°F) SAE 5W30 (below 32°F) …5
Engine oilSAE 10W30PRODUCT SPECIFICATIONS GASOLINE 1.25GAll ONS CAPACITY UNLEADED _, NDTYPE: REGUL/_R OIL TYPE SAE 10W30 API-SF/SG/SH): (above 32°F) SAE 5W30 (below …5
Engine oilSAE 5W30… ONS CAPACITY UNLEADED _, NDTYPE: REGUL/_R OIL TYPE SAE 10W30 API-SF/SG/SH): (above 32°F) SAE 5W30 (below 32°F) OIL CAPACITY: 4.0 PINTS SPARK PLUG …5
Belt850857… 72 131870 Spdng, Return 6 130832 Arm, Suspension, Rear 73 127847 Arm, Clutch, Secondary 8 850857 Belt, Hox 3/8-24 x 1.25 Grade 8 74 121748X Washer …49
Belt72110504… Washer, Spacer 114 73510500 Nut, Hax, Keps 5/16-18 UNC 32 153535 Pulley, Mandrel 115 72110504 Belt, Carriage 5/16 UNC x 1/2 33 137266 Nut, Toplock …49
Belt140294… Spdng, Return, Clutch 157 153236 56 STD523712 Bolt Hex 3/8-16x 1-1/4 158 165589 57 140294 V-Belt 159 165494 59 140312 Keeper, Center Span 160 …39
Blade134149… x 16 9 STD551137 Washer, Lock Gauge 10 140296 Washer, Hardened 75 12000029 Ring, KIIp 11 134149 Blade, Mulching 76 128903 Bolt, Shoulder 3/8-16 UNC …49
Tire pressure14C12YC GAP: .040") GROUND SPEED FORWARD: 0-5.5 (MPH): REVERSE: 0-2.4 TIRE PRESSURE: FRONT: 14PSI REAR: 10 PSI CHARGING 15 AMPS @ 3600RPM SYSTEM …5
Tire pressure10… GROUND SPEED FORWARD: 0-5.5 (MPH): REVERSE: 0-2.4 TIRE PRESSURE: FRONT: 14PSI REAR: 10 PSI CHARGING 15 AMPS @ 3600RPM SYSTEM: BATTERY: AMP/HR: 30 …5

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