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Honda EX4500S Generator Set

The Honda EX4500S is a Gasoline generator set powered by a Honda GX340 engine. It is available at 120/24 V, AC, 60 Hz and rated 6.3 A. It holds about 1.1 L (0.3 gal) of oil. An integrated tank holds 19 L (5.0 gal). The same GX340 engine also powers generator sets from Cummins/Onan.

0.39 L
Displacement
1.1 L
Oil capacity
1
Document types

How to read your Honda serial & model number →

Service parts for the EX4500S

Grouped by system, with how many of each the parts manual calls for.

Electrical

1 required
0612-6748Batterysee priceAmazon

Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.

Specifications

FuelGasoline
Frequency60.0 Hz
Standby kVA4
Oil capacity1.1 L
Voltage options120/24 V
PhaseAC
Rated current6.3 A
Battery voltage12 V
Fuel tank19.0 L

Engine

Honda GX340
Oil capacity1.16 L
Displacement0.39 L
AspirationForced-air
Rated speed3600 rpm

Maintenance & consumables

for the Honda GX340
ItemSpecCapacityPart #Interval
Air filter3600 hr
Fuel filter3600 hr
Oil filter200 hr
BatteryDisconnect both generator set starting battery cables before performing maintenance. Remove the negative (-) cable first to reduce the risk of arcing.0612-6748 Amazon eBay
Belt3600 hr
Coolant3600 hr
OilHonda 4-stroke oil or equivalent1.1 L200 hr
Spark plugNGK WlGEPR-U3600 hr

Common questions

Which engine powers the Honda EX4500S?

The Honda EX4500S is powered by the Honda GX340 engine.

Is the Honda EX4500S diesel or gas?

The Honda EX4500S runs on Gasoline.

What is the oil capacity of the Honda EX4500S?

The Honda GX340 engine in the Honda EX4500S has an oil capacity of 1.16 liters.

Troubleshooting

2

Symptoms & remedies

SymptomCauseRemedy
The engine will not startIs there fuel in the NO tank. Is there enough oil in the engine? (The oil alert lamp goes on when YES cranking the engine) Is there a spark from the spark plug?Refill the fuel tank. Add the recommended oil. (The oil alert lamp goes on when cranking the engine) Replace the spark plug. Clean any dirt around the spark plug. Set the side electrode on the cylinder head. Crank the engine, sparks should jump across the gap. Take the generator to an authorized HONDA dealer if the engine still does not start.
There is no electricity at the AC receptaclesIs the breaker on?Turn the AC circuit breaker on. Check the electrical appliance or equipment for any defects. Take the generator to an authorized HONDA dealer if there are defects. Take the electrical appliance or equipment to an electrical shop for repair.

Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.

Parts

44
Part #DescriptionQtySystem
11381-ZE3-801Gasket, sump cover1Gasket Amazon eBay $8.99
12251-ZE3-000Gasket, cylinder head1Gasket Amazon eBay $6.00
12391-ZE2-020Gasket, rocker cover1Gasket Amazon eBay $13.99
15510-ZE2-033Oil level switch1Sensor Amazon eBay $7.79
16220-ZA0-702Gasket, air cleaner housing1Gasket Amazon eBay $11.50 FridayParts $33.22
16221-ZF6-800Gasket, carb1Gasket Amazon eBay $5.99
16223-ZE3-W00Gasket, carb insulator1Gasket Amazon eBay $5.95
17210-ZE3-505Air filter1Air filter Amazon Amazon eBay $21.84 eBay $14.67 FridayParts $19.50
17672-ZE2-W01Fuel strainer1Fuel filter Amazon eBay $12.95 FridayParts $11.00
18333-ZE3-800Gasket, muffler pipe1Gasket Amazon Amazon eBay $10.78
18381-ZE2-W10Gasket, muffler1Gasket Amazon eBay $10.34
28400-ZE3-W01ZAStarter assy., NEW STYLE1Starter Amazon eBay $15.14
28422-ZE2-W01Starter pawl1Starter Amazon Amazon eBay $15.99 eBay $15.99
28434-ZE8-811Starter pawl retainer1Starter Amazon eBay $21.91
28442-ZE2-W01Starter spring1Starter Amazon Amazon eBay $8.99 eBay $8.99
28443-ZE2-W01Starter pawl spring1Starter Amazon Amazon eBay $8.70 eBay $8.70
28451-ZE3-A02Starter cup1Starter Amazon eBay $34.75
30500-ZE2-023Ignition coil1Sensor Amazon eBay $12.49 FridayParts $12.11
31ZH9600Spark arrester screen1Spark plug Amazon eBay
90003-ZG0-003Starter center screw1Starter Amazon eBay $12.50
91201-ZE3-004Oil seal PTO1Seal Amazon eBay $8.95 FridayParts $9.98
95/27.5Rated Amps1Rated current a buy
95001-45300-40SFuel line1Hose Amazon eBay $50.00
04108-ZE2-000Rocker cover1Service part / kit Amazon eBay $19.87
13010-ZE3-003Ring set (std)1Service part / kit Amazon eBay $26.00
13101-ZE3-W00Piston (std)1Service part / kit Amazon eBay $29.95 FridayParts $89.99
13200-ZE3-020Connecting rod (std)1Service part / kit Amazon eBay $35.95
14711-ZE3-000Valve, intake1Service part / kit Amazon eBay $31.59
14721-ZE3-000Valve, exhaust1Service part / kit Amazon eBay $29.54
1560-735-00Oil cap and indicator1Service part / kit Amazon eBay
15600-ZG4-003Oil cap1Service part / kit Amazon eBay $11.35
16100-ZE3-V01Carb assy.1Service part / kit Amazon eBay $105.99
16610-ZE1-000Choke lever1Service part / kit Amazon eBay $9.98
16955-ZE1-000Fuel tank joint1Service part / kit Amazon eBay $19.95 FridayParts $11.50
17510-ZE3-010Fuel tank1Service part / kit Amazon eBay $28.99
17620-ZH7-023Fuel cap1Service part / kit Amazon eBay $9.20 KuduParts $11.00
18310-ZE2-W61Muffler assy.1Service part / kit Amazon eBay $15.59
18320-ZE3-W01Muffler shield1Service part / kit Amazon eBay $30.00
18330-ZH9-N00Muffler pipe1Service part / kit Amazon eBay $19.99
19610-ZE3-010ZABlower housing1Service part / kit Amazon eBay
30009010Pilot screw1Service part / kit Amazon eBay
34150-ZH7-003Diode assy1Service part / kit Amazon Amazon eBay $25.99 eBay $11.99
36100-ZE1-015Switch, on/off1Service part / kit Amazon eBay $9.75
96100-62070-000Ball bearing, crankshaft1Service part / kit Amazon eBay

Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Available documents

Owner's manual — EX4500S, Serial Number EB3-1000001-1099999 (Honda)
Other sets with this engine