Fix it
Chainsaw Won't Start or Cuts Poorly? Fixes (2027)
A chainsaw that will not start, stalls or cuts slowly usually has one of five causes: battery, fuel, chain, oil or air. Five ordered fixes, from pack size to chain sharpness.
The saw refuses to start, stalls under load or produces dust instead of chips, and the instinct is to blame the tool. Work through the causes in order: battery delivery for battery saws, fuel freshness for gas saws, chain tension and sharpness for both, bar oil for both, and only then the saw's capability class. Most chainsaw complaints end at step one or two.
The battery cannot feed the saw its rated output
Output and cuts-per-charge figures assume the largest, fully charged, high-output battery the platform offers. A compact or half-charged pack can cut delivered power dramatically. Fit the biggest charged pack you own, reseat it firmly, and retry. If the saw recovers, the tool was never the problem, and the small pack should be retired to drill duty.
The gas saw has stale fuel or a flooded engine
Two-stroke fuel goes stale in weeks, and stale fuel is the most common reason a gas saw refuses to start after storage. Drain the tank, mix fresh fuel at 50:1 with quality 2-stroke oil, and follow the starting sequence: choke, prime, pull until it coughs, then half choke and pull to start. If the engine is flooded from over-priming, turn the choke off, hold the throttle open and pull several times to clear it.
The chain is dull, loose or fitted backwards
A dull chain produces dust instead of chips and forces the operator to push, which is both slow and dangerous. Sharpen with the correct file size and angle, or swap to a spare chain. Check tension: the chain should pull snugly around the bar by hand without sagging, and it should be re-checked after the first few cuts on a new chain. Confirm the cutters face forward, since a backwards chain cuts nothing and confuses every diagnosis.
The bar is starved of oil
A dry bar destroys chains quickly and makes any saw cut poorly. Check the oil reservoir, top it up with proper bar and chain oil, and confirm oil is reaching the bar by holding the running saw over a light surface and watching for a fine oil line. Clear a clogged oil port or bar groove with a thin tool, and never substitute used motor oil, which gums the system. On oil-free designs like the RYOBI PSBCW01B, this step does not apply, and the chain itself is the suspect instead.
The wood is beyond the saw's class
Some wood simply exceeds the saw: hardwood near the bar's limit, large-diameter rounds on a short bar, or an all-day session on a single small battery. The honest fix is the next class up, a bigger bar, a larger battery or a gas saw, not more patience. Forcing a small saw through big wood dulls chains, overheats motors and invites kickback. Recognising the class limit early saves the chain, the bar and the afternoon.
Questions, answered
Why does my battery saw stop mid-cut?
Usually battery protection tripping under load, a dull chain forcing the motor to work too hard, or a loose chain binding on the bar. Sharpen or swap the chain, check tension, and fit the biggest charged pack. If it still stops, the cut may exceed the saw's class.
How often should I sharpen the chain?
Whenever cutting produces dust instead of chips, the saw needs pushing, or the cut drifts to one side. During heavy bucking that can mean every tank or battery session. A few minutes with a file and guide keeps a chain cutting like new, and it is the highest-value maintenance habit a saw owner has.
Why is my gas saw hard to start after winter?
Stale fuel and a gummed carburettor are the usual culprits. Drain old fuel, mix a fresh 50:1 batch, and run the saw dry before storage next time. If fresh fuel and correct starting procedure do not help, the spark plug and air filter are the next checks, followed by a carburettor service.
My chain keeps coming off. Why?
Almost always tension: a new chain stretches in its first sessions and needs repeated re-tensioning, and a loose chain derails under load. Tension it so it pulls snugly by hand without sagging, check it after the first few cuts, and inspect the bar rails and drive sprocket for wear if the problem persists on a properly tensioned chain.
Every guide on Chainsaws15 pages
- Topic hubChainsaws
- Best ofThe Best Chainsaws (2027)
- This ranking covers only battery saws, because the battery decision is the whole purchase. The ranking separates on three things: bar length against the wood you cut, the battery platform you already own, and whether the box is a bare tool or a working kit. A flagship on a small pack is ranked below its headline, and a kit with a small included battery is flagged for it. Gas saws are excluded here, not judged inferior, because they answer a different question.The Best Battery Chainsaws (2027)
- Firewood cutting is the hardest honest test in this guide, because it combines diameter, volume and duration. A pruning saw cannot fake it, and a battery saw with one small pack cannot sustain it. This ranking weights bar length for the rounds you actually buck, sustained output over a session, and refuel or battery-swap stamina. Pruning specialists are excluded even when they are excellent saws, because firewood is not their job.The Best Chainsaws for Firewood (2027)
- Pruning rewards the opposite virtues from firewood: light weight, short bars, easy starting and control in tight spaces. This ranking excludes the heavy gas saws and the long-bar battery saws, even though they can prune, because carrying them through brush all day is the wrong tool for the job. Weight, balance, tensioning ease and starting effort decide this ranking more than peak power.The Best Chainsaws for Pruning and Limbing (2027)
- ReviewDEWALT 20V MAX XR DCCS620B 12 in. Compact Chainsaw Review (2027)
- ReviewMilwaukee M18 FUEL 2727-20 16 in. Chainsaw Review (2027)
- ReviewEGO Power+ CS1611 16 in. Chainsaw Kit Review (2027)
- ReviewGreenworks Pro 80V 18 in. Brushless Chainsaw Review (2027)
- ReviewMakita 18V X2 (36V) LXT 14 in. Chain Saw Kit Review (2027)
- ReviewDEWALT 60V MAX FLEXVOLT DCCS672X1 18 in. Chainsaw Kit Review (2027)
- Head to headMilwaukee 2727-20 vs DEWALT DCCS672X1 (2027)
- Head to headWORX WG322.9 vs BLACK+DECKER LCS1020 (2027)
- Buying guideChainsaw Buying Guide (2027)