Quick answer
Most "dead" Stihls are one of two things: the Master Control Lever sequence done out of order, or a flooded engine from too many pulls on full choke. Cold start: throttle trigger squeezed while you push the lever down to full choke, pull until the engine fires once, immediately move the lever up one notch to half choke, pull again, and it should run. If you've already pulled six times on full choke and smell gas, skip straight to the flooded-engine fix below.
The cold-start procedure, exactly
Stihl's single Master Control Lever runs the choke, the starting throttle lock, and the on-off switch, and the sequence matters:
- Engage the chain brake and put the saw flat on the ground. Left hand on the front handle, right foot toe in the rear handle.
- Squeeze the throttle lockout and throttle trigger, and while holding them, push the Master Control Lever all the way down to the cold-start (full choke) position. The lever won't reach full choke without the trigger squeezed — this is the step that trips people up.
- If your saw has a primer bulb, press it several times; it cuts down the number of pulls needed.
- Pull the starter cord straight up with short brisk pulls — don't let it rake across the fan housing.
- The moment the engine fires or "pops" once, move the lever up one notch to the half-choke position. This is the critical step: staying on full choke after that first pop is how Stihls flood.
- Pull again — the saw should start and run at fast idle. Blip the throttle once to drop the lever to the run position.
Warm engine? Skip the choke entirely: half-choke (or just fast idle on saws that have it) and pull.
Flooded: the smell of gas and no fire
More than three or four pulls at full choke floods most Stihls. Two ways out:
- The patient way: set the lever to the run position (choke fully open), hold the throttle wide open, and pull five to ten times. The extra air works the raw fuel through and the saw will usually cough to life. Let it scream at fast idle a second, then release.
- The thorough way: remove the spark plug, pull the cord several times with the plug hole open to purge fuel, let the cylinder air out a few minutes, dry or replace the plug, and restart with the lever at half choke — not full.
If flooding keeps happening on textbook-correct starts, the carburetor's metering side or the plug is suspect, not your technique.
Fuel: fresh mix or don't bother
A 2-stroke Stihl runs on 50:1 gas-to-oil mix, and ethanol-blend mix left in the tank for months turns to varnish that clogs the carburetor and hardens fuel lines. If the mix in the saw is old, dump it, refill with fresh mix or canned premix, and pump the primer (if fitted) before blaming hardware. Check the in-tank pickup filter and the fuel line while you're there — a line cracked at the tank grommet sucks air and starves the carb.
Spark, air, and the exhaust screen
- Plug: pull it and look. Wet and black after failed starts means flooding or a rich fault; crusted deposits, a cracked insulator, or a worn electrode mean replace. To confirm spark, ground the plug body against the cylinder with the boot on and watch for a snap while pulling — no spark with a new plug points at the ignition module.
- Air filter: a cake of sawdust chokes the mixture rich. Tap it clean or wash per the manual; replace if torn.
- Spark arrestor screen: a carbon-blocked screen in the muffler will let a saw fire and refuse to run — a classic on saws that idle a lot. Pull the screen, burn or brush the carbon off, or replace it.
Won't start hot
A saw that starts cold but refuses ten minutes after shutdown is usually vapor lock or a failing ignition module (they can die only when hot). Set the lever to run, hold the throttle open, and pull — same as the flood clear. If hot no-starts become a pattern while cold starts stay easy, have the module tested; that's a dealer-level part on most models.
Battery Stihls are a different checklist
If yours is an MSA-series battery saw, none of the above applies: check that the chain brake is pulled fully back (an engaged brake blocks the motor entirely), the battery is seated to the click, and the retaining latch is closed. Pack won't charge or flashes an error? Start with our Stihl battery charging guide. And if the engine runs but the chain won't move — gas or battery — that's the chain won't spin guide.