HERCULES
Models D,E,F,G,H,S 1-1/2 to 12HP Also Economy, Jaeger, etc.
We can't guess how many jobber's sold Hercules engines but the above were the most popular. Parts on this page are for the models listed above. However, some of these parts will also fit the not so common 'N' (contact us for more info). Use these links for the JI/JK and XI/XK parts listings. We do not have a listing for Thermoil. When ordering parts for Hercules please give the HP and the letter with it off the serial tag on the top of the engine (Jaeger engines have an extra plate on the lower side of the block-do not use info off of this tag for ordering). Here are some other notes that may be helpful to you. No Serial Plate? Give us the diameter of piston and we'll ask you a few questions to determine HP, etc. 1-1/2 to 2HP Cyl. blocks and caps have a double liner for the main bearing, one is a factory installed poured liner, not replaceable, and must be poured. The replaceable insert sits in this (APPLIES ONLY TO 1-1/2 to 2HP engines). History of Hercules by Glen Karch 1914-1934 This 20 year period is when most of the engines in collector's hands were made. Although this book is on Hercules engines it is good reading for anyone.

Part#	Description	Price
L25	Instruction & Parts, 1-1/2 to 12HP, 64 pages	9.00
L270	History of Hercules by Glen Karch	10.00
L271	Serial number list	1.00
L076	Instruction & Parts, Economy 1-1/2 to 12HP, 1926	4.00
HM302	Bearing, Rod 1-1/2 to 2HP	18.50
HM3021	Bearing, Rod 2 to 2-1/2HP (cly bore 3-5/8")	26.50
HM3022	Bearing, Rod 2-1/2 to 3-1/2HP	29.00
HM3023	Bearing, Rod 5-6HP	37.00
HM3024	Bearing, Rod 7-8HP	44.00
HM3025	Bearing, Rod 9HP	52.50
HM3026	Bearing, Rod 12HP	84.00
HM303	Bearing, Main, 1-1/2 to 2HP	23.00
HM3031	Bearing, Main, 2 to 2-1/2HP (cyl. bore 3-5/8")	30.00
HM3032	Bearing, Main, 2-1/2 to 3HP	33.50
HM3033	Bearing, Main, 5-6HP	48.00
HM3034	Bearing, Main, 7HP	57.50
HM3035	Bearing, Main, 9HP	80.00
HM30355	Bearing, Main, 12HP	140.00
HM305	Carb, Choke Plate, 1-1/2 to 2HP	8.50
HM306	Carb, Choke Plate, 2-1/2 to 3-1/2HP	9.00
HM307	Carb, Choke Plate, 5-6HP	9.50
HM309	Carb, Needle Valve, 1-1/2 to 2HP	14.75
HM310	Carb, Needle Valve flat spring (held on with screw)	6.00
HM311	Carb, Needle Valve wire spring (goes in hole)	1.00
The Following carb parts are for kero. pump type carbs.
HM3036	Carb Drain Valve	16.00
HM308	Carb Fill Hole Lid	8.50
HM3037	Carb Fuel Needle Valve	14.75
HM3038	Carb Pump Body	77.50
HM3039	Carb Pump Plunger	28.50
HM431	Carb Throttle Water Valve Assembly	45.00
For related parts see "Fuel Line Assy", etc.
HM315	Con. Rod Bushing 1-1/2 to 2HP	10.00
HM3151	Con. Rod Bushing 2 to 2-1/2HP (3-5/8" bore)	11.00
HM316	Con. Rod Bushing 2-1/2 to 3-1/2HP	13.00
HM317	Con. Rod Bushing 5-6HP	15.00
HM3171	Con. Rod Bushing 7HP	18.00
HM318	Crankguard 1-1/2 to 2HP	47.50
HM320	Crankhandle 1-1/2 to 2HP, closed style	35.00
HM3205	Decal, ARCO	5.00
HM321	Decal, Economy 1-5/8" X 6"	3.00ea
HM322	Decal, Economy 3-3/4" X 10"	7.00ea
HM323	Decal, Economy "Propeller" 2-1/8" X 6-1/2"	5.00ea
HM325	Decal, Hercules Engine	5.00ea
HM327	Decal, Jaeger	7.00ea
HM329	Exhaust Rocker Lever, 1-1/2HP **Model 'N' ONLY	37.50
HM330	Exhaust Rocker Lever 1-1/2 to 2HP	26.50
HM3305	Exhaust Rocker Lever 2 to 2-1/2HP 'S' **w/3-5/8" bore	37.50
HM331	Exhaust Rocker Lever 2-1/2 to 3-1/2HP	35.00
HM332	Exhaust Rocker Lever 5-6HP	36.50
HM3325	Exhaust Rocker Lever 7-8HP	52.50
HM333	Exhaust Rocker Lever adjustment bolt (like original)	6.50
HM334	Exhaust Push Rod assy. 1-1/2 to 2HP	72.50
HM3345	Exhaust Pushrod assy. 2HP 'H', 2-1/2HP 'S'	72.50
HM335	Exhaust Push Rod only	35.00
HM336	Exhaust Cam Roller 1-1/2 to 2HP	12.50
HM3361	Exhaust Cam Roller 2-1/2 to 12HP	12.50
HM337	Exhaust Cam Roller Pin Only 1-1/2 to 2-1/2HP model 'S'	12.50
HM3371	Exhaust Cam Roller Pin Only 2-1/2 model 'E' to 12HP	7.50
HM338	Exhaust Detente Latch Block 1-1/2 to 2HP	20.00
HM3382	Exhaust Detente Latch Block 2-1/2 to 12HP	20.00
HM339	Flywheel Key, Straight, 1-1/2 to 2HP	1.00
HM3391	Flywheel Key, Straight, 2-1/2 to 2-1/2HP (3-5/8" bore)	1.00
HM3392	Flywheel Key, Straight, 2-1/2 to 3-1/2HP	1.00
HM3393	Flywheel Key, Straight, 5-6HP	1.50
HM3394	Flywheel Key, Straight, 7-8HP	1.50
HM340	Fuel line assy. (from tank to carb)	18.50
HM3405	Fuel line check valve (included with HM340)	10.50
HM3511	Fuel Line 'T' (inc. with HM340)	2.00
HM3435	Fuel Tank "H" Model 2HP, Fills In Back	47.50
HM343	Fuel Tank, Fills Mag Side, 1-1/2 to 2HP	47.50
HM344	Fuel Tank, Fills Opposite Side, 1-1/2 to 2HP	47.50
HM345	Fuel Tank, Fills Mag Side, 2-1/2 to 3-1/2HP	52.00
HM346	Fuel Tank, Fills Opposite Side, 2-1/2 to 3-1/2HP	52.00
HM347	Fuel Tank, Fills Mag Side, 5-6HP	62.50
HM348	Fuel Tank, Fills Opposite Side, 5-6HP	62.50
HM3485	Fuel Tank, Fills Mag Side, 7-8HP	68.00
HM3486	Fuel Tank, Fills Opposite Side, 7-8HP	68.00
HM349	Fuel Tank Filler Spout w/lid, 1-1/2 to 5HP	35.00
HM350	Fuel Tank Filler Lid, 1-1/2 to 2HP	4.50
HM351	Fuel Tank Lid, Swivel 1-5/8" dia.	4.50
HM3512	Fuel Tank Lid, Swivel 2-5/8" dia.	4.50
HM352	Gasket, Cyl. Head, 1-1/2 to 2HP	6.50
HM353	Gasket, Cyl. Head, 2 to 2-1/2HP (3-5/8" bore)	6.50
HM354	Gasket, Cyl. Head, 2-1/2 to 3-1/2HP	7.50
HM355	Gasket, Cyl. Head, 5-6HP	8.50
HM356	Gasket, Cyl. Head, 7-8HP	9.50
HM357	Gasket, Mag Bracket, 1-1/2 to 2-1/2HP model 'S'	2.00
HM358	Gasket, Mag Bracket, 2-1/2 to 12HP	2.00
HM3585	Gear, Cam, 1-1/2 to 2HP	145.00
HM3586	Gear, Cam, 2-1/2 'E' to 6HP	165.00
HM3587	Gear, Cam, 7-8HP	185.00
HM359	Gear, Crankshaft pinion, 1-1/2 to 2HP	72.50
HM3592	Gear, Crankshaft Pinion, 2-1/2 'E' to 3-1/2HP	85.00
HM3594	Gear, Crankshaft Pinion, 5-6HP	85.00
HM3596	Gear, Crankshaft Pinion, 7-8HP	115.00
HM360	Gear, Gov. Pinion, 1-1/2 to 12HP	42.50
HM362	Gov. Detente Blade, 1-1/2 to 2HP	22.50
HM3621	Gov. Detente Blade, 2-1/2 to 12HP,(1 bolt hole)	27.50
HM3621A	Gov. Detente Blade, 2-1/2 to 12HP,(2 bolt hole)	27.50
HM3621B	Gov. Detente Blade Bolt, 1-1/2 to 12HP	10.50
HM3621C	Gov. Detente Blade Adjusting Screw	10.50
HM3622	Gov. Detente Lever, 1-1/2 to 2HP	34.00
HM3624	Gov. Detente Lever, 2-1/2 to 12HP	34.00
HM363	Gov. Spindle Rod, 1-1/2 to 2HP	15.50
HM3632	Gov. Spindle Rod, 2HP (3-5/8" bore)	15.50
HM364	Gov. Spindle Rod, 2-1/2 to 12HP	16.50
HM3642	Gov. Spindle Shaft, 1-1/2 to 2HP	82.50
HM3645	Gov. Bracket 1-1/2 to 2HP (3-1/4" bore)	82.50
HM365	Gov. Speed Control Lever 1-1/2 to 12HP	6.50
HM366	Gov. Weight 1-1/2 to 2-1/2HP	14.00
HM3662	Gov. Weight 2-1/2 to 12HP (round style)	24.50
HM368	Gov. Weight Pin, 1-1/2 to 2-1/2HP model 'S'	1.50
HM369	Gov. Weight Pin, 2-1/2 to 12HP (early style weight)	2.00
HM371	Grease Cup, Auto, Brass, 1-1/2 to 2HP model 'S'	41.00
HM372	Grease Cup, Auto, Brass, 2-1/2 to 12HP model 'S'	48.00
GR03	Grease Cup, Rod, 1-1/2 to 2-1/2HP	5.75
GR04	Grease Cup, Main, 1-1/2 to 2-1/2HP	7.00
GR05	Grease Cup, Rod, 2-1/2 to 12HP	9.00
GR07	Grease Cup, Main, 2-1/2 to 12HP	13.50
WICO 'EK' mag linkage parts
HM374	Mag Bracket, 1-1/2 to 2-1/2HP model 'S'	45.00
HM375	Mag Bracket, 2-1/2 to 12HP	47.50
EK11	EK Trip Rocker group - contains rocker, latch block and latch block adjusting screw - (will also work with WICO PR)	24.50
EK14	Armature Return Spring, EK	3.30
EK18	Trip Finger Mag Drive Spring, EK	3.30
EK22	Armature Spring Support, EK	8.00
EK23	Armature Spring Support Shaft & Nut, EK	12.50
EK24	Trip Finger Assy., EK	47.50
EK25	Trip Finger Latch Group Only, EK	20.50
EK26	Finger Frame Group Only, EK	27.50
EK27	Trip Finger Retard Lever, EK	4.50
HM386	Trip Finger Bracket, 1-1/2 to 2-1/2HP model 'S'	29.50
HM387	Trip Finger Bracket 2-1/2 to 12HP	26.00
HM3879	Push Rod Clamp 1-1/2 to 2-1/2HP	28.50
HM388	Push Rod Clamp 2-1/2 to 12HP	34.00
For WICO 'EK' mag. parts see WICO 'EK' mag. section
Webster mag linkage parts
WEB11	Mag. Trip Finger Assy. 1-1/2 to 12HP	47.50
For Webster mag parts see Webster mag. section
HM393	Muffler, Ball, 7" dia., 1" to 1-1/2NPT (state pipe size)	47.50
HM394	Muffler, Ball, 9" dia., 2" to 2-1/2NPT (state pipe size)	85.00
HM395	Muffler, Cone, 6" dia., 1" to 1-1/4NPT (state pipe size)	47.50
These mufflers are nicely cast with square head bolts.
HM396	Nameplate, 1-1/2 to 12HP	8.00
	Oilers
HM3965	Piston, 1-1/2 to 2HP (3-1/4" bore), oversize available	137.50
HM397	Piston Wrist Pin, 1-1/2 to 2HP	13.75
HM3975	Piston Wrist Pin, 2 to 2-1/2HP (3-5/8" bore)	13.75
HM398	Piston Wrist Pin, 2-1/2 to 3-1/2HP	15.40
HM399	Piston Wrist Pin, 5-6HP	19.25
HM3991	Piston Wrist Pin, 7-8HP	20.90
HMR20	Piston Ring, 3-1/4" x 1/4", 1-1/2 to 2HP	5.25ea
HMR28	Piston Ring, 3 5/8" x 1/4", 2 to 2-1/2HP(3-5/8" bore)	5.25ea
HMR35	Piston Ring, 4" x 5/16" model 'E', 2-1/2HP	6.75ea
HMR39	Piston Ring, 4 1/4" x 5/16", 3 to 3-1/2HP	6.75ea
HMR48	Piston Ring, 5" x 3/8", 5-6HP	10.25ea
HMR52	Piston Ring, 5 3/4" x 3/8", 7-8HP	12.25ea
HM400	Pulley With Set Screw, 1-1/4" shaft	65.00
HM401	Pulley With Keyway and Set Screw, 1-1/4" shaft	72.50
Pulleys for shafts to 1-1/2
HM02	Spark plug, 1/2" NPT	4.50
HM4015	Spring, Detent, 1-1/2 to 12HP	2.20
HM402	Spring, Exh. Push Rod, 1-1/2 to 2-1/2HP model 'S'	4.40
HM403	Spring, Exh. Push Rod, 2-1/2 to 8HP	4.40
HM404	Spring, Gov. Spindle Rod, 1-1/2 to 2HP	3.30
HM405	Spring, Gov. Spindle Rod, 2-1/2 to 12HP	3.30
HM406	Spring, Exh. Valve, 1-1/2 to 2HP	4.40
HM407	Spring, Exh. Valve, 2-1/2 to 6HP	4.40
HM4075	Spring, Exh. Valve, 7-8HP	5.50
HM408	Spring, Int. Valve, 1-1/2 to 2HP	4.40
HM409	Spring, Int. Valve, 2-1/2 to 6HP	4.40
HM4095	Spring, Int. Valve, 7-8HP	5.50
HM4097	Spring, Valve Lock, 2-1/2 to 12HP	2.50
HM415	Valve, Exh. or Int., 1-1/2 to 2HP	26.50
HM4155	Valve, Exh. or Int., 2 to 2-1/2HP (3-5/8" bore)	26.50
HM416	Valve, Exh. or Int., 2-1/2 to 3-1/2HP	28.50
HM417	Valve, Exh. or Int., 5-6HP	34.00
HM418	Valve, Exh. or Int., 7-8HP	40.00
HM4183	Valve, Exh. or Int., 9HP	45.00
HM4185	Valve, Exh. or Int., 12HP	51.00
HM4192	Valve Lock, 2-1/2 to 3-1/2HP	12.00
HM4193	Valve Lock, 5-6HP	12.00
HM4194	Valve Lock, 7-8HP	12.00
HM4195	Valve Lock, 9-10HP	12.00
HM4197	Valve Lock Stud, 2-1/2 'E' to 8HP	4.50