Brush cutter advice & how-to
Practical, step-by-step help for getting the best from your brush cutter — starting, using, maintaining and staying safe.
Start here — the essentials
How to start a brush cutter Cold and warm petrol starts, cordless start-up, and no-start fixes. Read → How to use a brush cutter The right cutting technique for grass, long growth and brambles. Read → Brush cutter maintenance Fuel, filters, plugs, cutting head and winter storage. Read → Brush cutter safety tips PPE, keeping bystanders clear and avoiding blade kickback. Read → How to change the line Choosing, winding and feeding new trimmer line, step by step. Read → How to choose a brush cutter The complete buying guide — type, engine, blades and more. Read →
Troubleshooting
Won't start, cuts out, loses power — diagnose and fix it.
- Brush cutter won't start: the 9 causes (and the fix for each)
- 4-stroke brush cutter leaking oil: causes
- Brush cutter blowing blue smoke: too much oil in the mix
- Brush cutter blowing white smoke: what it means
- Brush cutter dies at full throttle: causes and fixes
- Brush cutter gearbox getting hot: what to check
- Brush cutter hard to start when cold: causes and fixes
- Brush cutter hard to start when hot: the vapour-lock fix
- Brush cutter has no spark: how to test and fix the ignition
- Brush cutter keeps cutting out intermittently
- Brush cutter leaking fuel: where it comes from and how to stop it
- Brush cutter loses power under load: why it bogs down in thick grass
- Brush cutter making a rattling or knocking noise
- Brush cutter not cutting cleanly: why it tears grass
- Brush cutter only runs with the choke on: what it means
- Brush cutter overheating: causes, damage risk and fixes
- Brush cutter primer bulb not filling: causes and fix
- Brush cutter pull cord stuck or won't pull
- Brush cutter pull cord won't retract
- Brush cutter recoil hard to pull (but not seized)
- Brush cutter stalls once warm: the fixes
- Brush cutter starts then dies: why it cuts out after a few seconds
- Brush cutter vibrating excessively: find the cause fast
- Brush cutter won't idle: it dies when you release the throttle
- Brush cutter won't rev up: stuck at low revs
- Fuel not reaching the carburettor: how to diagnose
- How to read a brush cutter spark plug
- How to unflood a flooded brush cutter
- Why is my brush cutter backfiring?
Fuel, oil & carburettor
Mixing ratios, carb settings, filters and plugs.
- 2-stroke fuel ratio chart: 50:1, 40:1 and 25:1 in ml and litres
- Brush cutter carburettor screws explained: what L, H and T actually do
- Ethanol petrol (E10) and brush cutters: the damage and how to avoid it
- How to adjust a brush cutter carburettor (L, H and T)
- How to adjust brush cutter idle speed (the T screw)
- How to change a brush cutter spark plug (and read what it tells you)
- How to clean a brush cutter air filter (foam, felt and paper)
- How to clean a brush cutter carburettor without removing it (and with)
- How to clean a brush cutter fuel tank
- How to clean a brush cutter spark arrestor screen
- How to decarbonise a 2-stroke brush cutter exhaust
- How to drain old fuel from a brush cutter safely
- How to mix 2-stroke fuel for a brush cutter (step by step)
- How to replace a brush cutter carburettor
- How to store 2-stroke fuel safely
- What fuel does a brush cutter use? Petrol, octane and alkylate explained
Line, heads & blades
Fitting, sharpening and fixing the cutting gear.
- Brush cutter blade keeps loosening in use
- Brush cutter blade kickback (blade thrust): what causes it and how to avoid it
- Brush cutter head keeps coming loose or unscrewing
- Brush cutter head types explained: bump feed, auto feed, fixed line and blade
- Brush cutter head won't spin: clutch, drive shaft and gearbox
- Brush cutter line keeps breaking: 7 reasons and the fixes
- Brush cutter line size guide: which diameter to use
- Brush cutter line welding or fusing together in the spool
- Brush cutter line won't feed out: bump feed and auto-feed fixes
- How to balance a brush cutter blade after sharpening
- How to fit a brush cutter blade correctly and safely
- How to load line in a bump-feed head
- How to remove a stuck brush cutter head
- How to replace a brush cutter clutch
- How to replace or fix a bent brush cutter shaft
- How to sharpen a brush cutter blade (file, grinder and balance)
- How to thread brush cutter line through the eyelets
- When to replace a brush cutter blade: 6 signs it is done
Servicing & storage
Keep it running for years — routine jobs and winter prep.
- Brush cutter clutch problems: slipping, dragging and how to fix
- Brush cutter maintenance schedule: what to do every use, month and year
- Brush cutter winter storage: the 8-step end-of-season routine
- How long does a brush cutter last?
- How much does a brush cutter service cost? (2026 prices)
- How to break in a new petrol brush cutter
- How to check brush cutter compression
- How to clean a brush cutter after use (5 minutes that add years)
- How to grease a brush cutter gearbox (angle drive)
- How to replace a brush cutter fuel filter
- How to replace a brush cutter pull cord (recoil starter)
- How to service a brush cutter yourself: the full annual service
- How to transport a brush cutter safely (car, van and trailer)
- What to do if your brush cutter hits a rock or wire
Cutting technique
Brambles, slopes, edges and overgrown ground, done right.
- Brush cutter buying checklist: 10 things to check
- Brush cutter scything technique: the right cutting motion
- How to adjust a brush cutter harness correctly
- How to clear nettles with a brush cutter (and stop them returning)
- How to clear overgrown land with a brush cutter: a staged plan
- How to clear the bottom of a hedge with a brush cutter
- How to cut around fences, posts and walls without wrecking the line
- How to cut brambles with a brush cutter (without jamming it)
- How to cut long grass without clogging the head
- How to cut tall or wet grass with a brush cutter
- How to strim around obstacles, trees and posts safely
- How to strim around trees without killing them
- How to strim clean edges and borders
- How to use a brush cutter harness correctly
- How to use a brush cutter on a slope safely
Safety, noise & the law
PPE, hearing, vibration and what the rules say.
- Are brush cutters dangerous? The real risks
- Brush cutter eye and face protection: mesh visor or goggles?
- Brush cutter injuries and first aid: what to do
- Brush cutter noise levels and hearing protection explained
- Brush cutter PPE: what you must wear (and what the law requires)
- Brush cutter safety distance: keeping people, pets and windows safe
- Brush cutter vibration and HAVS: exposure limits and how to protect yourself
- Can you use a brush cutter in the rain?
- Do you need a licence or training for a brush cutter?
- Petrol vs battery brush cutter running costs compared
- When can you use a brush cutter? Noise rules and permitted hours
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