OrphanSpecStraight answers for orphaned outdoor equipment

Poulan 917.279891

Front Engine Lawn Tractor — service parts and specifications. Also written 917279891.

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.4
Spark plug gap
.040 p.4
Engine oil
10W30 (cold) · SAE 30 (above) · SAE 5W-30 (above) p.15, 17
Belt
136801 (drive) p.33
Blade
134149 (mulching) · 138498 (mulching) p.41
Tire pressure
14 · 10 p.4

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 plugRC12YC… 32°F) OIL CAPACITY: W/FILTER: 4.0 PINTS W/OFILTER: 3.75 PINTS SPARK PLUG: CHAMPION RC12YC (GAP: .040") GROUND SPEED (MPH): FORWARD: I st 1.2 2nd …4
Spark plug gap.040… 32°F) SAE 5W-30 (below 32°F) OIL CAPACITY: W/FILTER: 4.0 PINTS W/OFILTER: 3.75 PINTS SPARK PLUG: CHAMPION RC12YC (GAP: .040") GROUND SPEED (MPH) …4
Engine oil10W30I_,_._.__-_-_._,..._! i I ' \ / ',_"_, _GEARSHIFT , L ,. k ..... J_r_J i PIVOTS _SAE 30 OR 10W30 MOTOR OIL (_GENERAL PURPOSE GREASE (_) REFER TO …15
Engine oilSAE 30IFICATIONS GASOLINE CAPACITY 2.00 GALLONS AND TYPE: UNLEADED REGULAR OILTYPE (API-SF-SJ): SAE 30 (above 32°F) SAE 5W-30 (below 32°F) OIL CAPACITY …4
Engine oilSAE 5W-30CAPACITY 2.00 GALLONS AND TYPE: UNLEADED REGULAR OILTYPE (API-SF-SJ): SAE 30 (above 32°F) SAE 5W-30 (below 32°F) OIL CAPACITY: W/FILTER: 4.0 PINTS …4
Belt136801… Spring Return Clutch 6 75 197 169613 56 17060620 Screw 3/8-16 x 1-1/4 198 169593 57 136801 V-Belt Gd Drive 202 72110612 59 169691 Keeper Belt …33
Blade134149… 19061216 9 10030600 Washer, Lock 104 10071000 10 140296 Washer, Hardened 105 160793 11 134149 Blade, Mulching 42" Std 106 2029J 138498 Blade Mower …41
Blade138498… 10 140296 Washer, Hardened 105 160793 11 134149 Blade, Mulching 42" Std 106 2029J 138498 Blade Mower 42" Hi-Lift Std 111 179292X421 13 137645 Shaft …41
Tire pressure14WARD: I st 1.2 2nd 1.5 3rd 2.4 4th 3.5 5th 4.8 6th 5.3 REVERSE: 1.5 TIRE PRESSURE: FRONT: 14 PSI REAR: 10 PSI CHARGING 3 AMPS BATTERY 5 AMPS …4
Tire pressure10… 2nd 1.5 3rd 2.4 4th 3.5 5th 4.8 6th 5.3 REVERSE: 1.5 TIRE PRESSURE: FRONT: 14 PSI REAR: 10 PSI CHARGING 3 AMPS BATTERY 5 AMPS HEADLIGHTS BATTERY …4

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