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How to use a petrol earth auger

Updated: 21.10.2026

The two-stroke is in the shed, and the dangerous moment is the one before the cord moves. A petrol earth auger will spin the handles if the bit stops in a root, and a two-stroke run in a closed garage can fill the space with exhaust. This is the sequence for how to use a petrol earth auger. Bit choice for a post sits on the [petrol auger for fence posts](/hub/garden-tools/petrol-earth-auger/sub/petrol-earth-auger-fence-posts) page. What the six listings omit is on the [petrol earth auger comparison](/hub/garden-tools/petrol-earth-auger). The Products Compared editorial team drew the steps from UK hire sheets and the Health and Safety Executive on 20 October 2026. A purchase through our links may earn a commission at no extra cost to you.

The two-stroke is in the shed, and the dangerous moment is the one before the cord moves.

Our top picks

Donened Donened 52 cc petrol earth auger

Best overall

Donened Donened 52 cc petrol earth auger
6.8/10about £109.99
View offer
Draper Draper 51.7 cc petrol earth auger

Rank 2

Draper Draper 51.7 cc petrol earth auger
7.4/10about £214.79
View offer
Donened Donened 52 cc powerhead

Best value

Donened Donened 52 cc powerhead
4.0/10about £60.50
View offer
On this page
  1. 1.Before the cord
  2. 2.Start and stance
  3. 3.Drill, clear, and a jam
  4. 4.When you stop for good

Before the cord

Check the ground before you mix fuel. The Health and Safety Executive's guidance on underground cables asks for plans, a locator and trial holes where a service is shown or the ground is uncertain. LSBUD is a place to start. If you strike a cable, the UK electricity emergency number is 105. Mix to the manual for the machine in your hands, and shake the can. Draper Tools states 40:1 for the 30278 only. The other listings in our set do not print a ratio, and Speedy's hire guide tells you to check the bottle rather than inherit a number. GOV.UK says to check garden machinery before you use E10. The Draper listing states E10 compatibility. A silent listing stays on its own manual. Start outdoors, because exhaust in a closed garage is a carbon monoxide risk. A Doncaster hire sheet for a one-man auger warns of noise up to 107 dB(A) and calls for boots and gloves. That figure is the sheet's warning, not a reading for every Amazon model.

Start and stance

Speedy's sequence is a usable pattern when your manual agrees. Prime four or five times, set the choke, put the machine on the ground with a foot holding it, and pull the cord. Once it is running, take the choke off. Squeeze the trigger only when the tip is over the mark and has bitten. Idle must not be doing the drilling. STIHL's BT 131 manual, which applies to that machine and its drill brake, says start outdoors at least 3 metres from where you refuelled, with the brake engaged before the cord. Our Amazon listings mostly do not mention a brake. If yours has none, you do not invent a QuickStop. Keep both hands on the handles from the moment the bit can turn. A Doncaster sheet titled as a one-man auger still tells two able-bodied adults to do the work, and it describes the body spinning if you fail to stop a jam. Whether you are alone is on the one man or two man post hole borer page. You release the throttle the instant the bit meets something solid.
Donened Donened 52 cc petrol earth auger

Testsieger

Donened Donened 52 cc petrol earth auger
6.8/10about £109.99
View offer

Drill, clear, and a jam

Open the throttle after the tip has seated, and let the bit cut. In heavy clay, the STIHL manual's approach on that machine is to bore part of the way, lift out and clear the flighting, then go back in. The Doncaster sheet says the same kind of lift while the bit is still turning, so spoil leaves the hole. Clear in short lifts, with both hands, and stop if the machine starts to labour. If the bit jams, stop the engine before you wrestle the flight. The Doncaster sheet then uses the gear lock and turns the whole machine anti-clockwise. That unwind is with the engine stopped. An extension goes on only after the bit is already as deep as it will go, which is the same sheet's rule. The Donened kit at £109.99 names an extension and does not state its length. Fit only the bar the manual allows.

When you stop for good

Stop when you cannot say what the bit has hit, and use a spade for a trial hole. Refuel only with the engine stopped and cool, away from the hole, and wipe spilled mix off the casing. Speedy's guide tells you to shut down on the rocker switch and not to touch the hot parts. Stop for a person when the ground is rubble, when the locator will not give you a clear run, or when you cannot hold the handles through a jam. A fencing contractor is the right call for a long run in unknown ground. A spade is the right call for one hole beside a wall, where a spinning powerhead has nowhere to go.

Common questions

What order do I start it in?
Follow the manual if it differs. Otherwise check services, mix outdoors, prime, choke on, hold the machine with a foot, pull the cord, take the choke off once it runs, and open the throttle only when the tip is in the mark.
Where do I stand?
Both hands on the handles, body clear of the swing if the bit stops. Face the open garden rather than a fence you could be thrown into.
What do I do when it kicks?
Release the throttle at once. If the bit has stopped dead, stop the engine before you try to free the flighting. On a listing that never mentions a brake, your stop is the switch.
How do I get a stuck bit out?
Engine off first. The Doncaster sheet then locks the gear and turns the whole machine anti-clockwise to unwind the bit. If it will not unwind, dig beside the flighting until the obstruction is visible.
Can I use it in a garage?
Start and run it outdoors. A two-stroke in a closed garage is a carbon monoxide problem. Pull the cord in the open, a few metres from where you poured the fuel.
When should I stop and not carry on?
Stop when the bit hits something you did not expect, when you cannot confirm services, or when the handles are winning. A cable you may have nicked is a contractor and, for electricity, 105.

Related pages

Petrol earth auger buying guide

Petrol earth auger

Best petrol earth auger on these amazon.co.uk files

Petrol auger for fence posts: depth and hole width

One man or two man post hole borer: handles and hire

Sources

Public UK sources used for this comparison. Listing prices, stars, and review counts are the six kept amazon.co.uk files. Scores were updated on 20 October 2026.

  1. HSE — Control of Vibration at Work Regulations (retrieved 20.10.2026)
  2. HSE — INDG480, vibration in horticulture (retrieved 20.10.2026)
  3. Control of Noise at Work Regulations 2005 (retrieved 20.10.2026)
  4. GOV.UK — E10 petrol explained (retrieved 20.10.2026)
  5. HSE — Underground cables (retrieved 20.10.2026)
  6. LSBUD — UK utility-map search (retrieved 20.10.2026)
  7. Draper Tools — petrol earth auger 30278 (retrieved 20.10.2026)
  8. Ron Smith — choosing an earth auger (retrieved 20.10.2026)