The EF2000iS puts out 1,600 W continuously and up to 2,000 W for a few seconds when a motor starts. It runs up to 10.5 h at ¼ load on a full 1.11 gal4.2 L tank. It weighs 44 lb20 kg. Noise is rated at 51.5 dBA at ¼ load, 7 m, economy control on. It takes 0.42 qt0.4 L of engine oil, and the source recommends SAE 10W-30 or 10W-40 (Yamalube 4 10W-40), API SE or higher. The spark plug is NGK BPR6HS, gap 0.024–0.028 in (0.6–0.7 mm).
Specifications
Units: /| Power | |
|---|---|
| Running output | 1,600 W 1Yamaha's manual lists rated output as 1.6 kVA and 1,600 W for loads with a power factor of 1. |
| Starting output | 2,000 W 3Yamaha Motor Canada lists maximum AC output as 2000 W (16.7 A) for the same 120 V, 60 Hz model. Yamaha's global spec page gives 2.0 kVA. |
| Voltage | 120 V 1 |
| Inverter (clean power for electronics) | Yes 2 |
| Engine | |
| Engine | Air-cooled 4-stroke OHV, single cylinder 1 |
| Displacement | 79 cc 1 |
| Fuel | Unleaded gasoline 1 |
| Starting | Recoil 2 |
| Fuel and run time | |
| Tank | 1.11 gal4.2 L 1 |
| Run time | 10.5 h 1at ¼ load4.2 hours at rated load. |
| Size and noise | |
| Weight | 44 lb20 kg 1Dry weight. Yamaha Motor Canada lists 21 kg (46 lb). |
| Length × width × height | 19.3 × 11.0 × 17.9 in490 × 280 × 455 mm 1Yamaha's US manual prints the length as 490 mm (13.3 in); Yamaha Motor Canada prints 490 mm (19.3 in). Yamaha's global spec page gives a height of 445 mm. |
| Noise | 51.5 dBA 1at ¼ load, 7 m, economy control on61 dB(A) at rated load. Average of four sides, measured 7 m away. |
| Outlets | |
| Outlets | 12 V DC output (8 A) The manual doesn't list the type of AC receptacle. |
Oil, spark plug and service
What to have on the bench before an oil change or tune-up.
| Oil capacity | 0.42 qt0.4 L 1 |
| Oil type | SAE 10W-30 or 10W-40 (Yamalube 4 10W-40), API SE or higher 1The manual's temperature chart also allows SAE 30, SAE 20 and 10W. |
| Spark plug | NGK BPR6HS, gap 0.024–0.028 in (0.6–0.7 mm) 1 |
| Change oil every | After the first month or 20 hours, then every 6 months or 100 hours 1 |
Parts
Search links for common parts. Check the part number against the label on your unit before you buy.
| Part | Find it |
|---|---|
| Air filter | Amazon · eBay |
| Spark plug | Amazon · eBay |
| Engine oil | Amazon · eBay |
We may earn a small commission if you buy through these links. It doesn't change what we list. More.
Model numbers
This page covers model number EF2000iS. Brands often sell the same name under several numbers with small differences, so check the label on the frame.
Compare
Often compared: Honda EU2000i, Predator 2000 Super Quiet Inverter, Yamaha EF2200iS, WEN 56203i
Questions people ask
How much oil does the Yamaha EF2000iS take?
0.42 qt0.4 L. Oil type: SAE 10W-30 or 10W-40 (Yamalube 4 10W-40), API SE or higher. Oil change: After the first month or 20 hours, then every 6 months or 100 hours.
What spark plug does the Yamaha EF2000iS use?
NGK BPR6HS, gap 0.024–0.028 in (0.6–0.7 mm), according to the source. Check the plug in your unit before you buy a replacement.
How long does the Yamaha EF2000iS run on a tank?
10.5 h. That's at ¼ load, according to the source. More load means less time.
How much does the Yamaha EF2000iS weigh?
44 lb20 kg. Dry weight. Yamaha Motor Canada lists 21 kg (46 lb).
How loud is the Yamaha EF2000iS?
51.5 dBA. Measured at ¼ load, 7 m, economy control on.
What's the difference between 1,600 W and 2,000 W?
1,600 W is what it can supply continuously. 2,000 W is a short burst for the moment a motor (a fridge, a pump, an AC unit) starts up.
Sources
- Yamaha EF2000iS owner's manual (LIT-19626-01-68, 2011). Owner's manual, accessed November 11, 2026.
- Yamaha EF2000iS specifications, 120 V 60 Hz. Manufacturer, accessed November 11, 2026.
- Yamaha EF2000iS specifications, Yamaha Motor Canada. Manufacturer, accessed November 11, 2026.
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