Ever yanked that starter cord until your arm feels like spaghetti and still nothing? Trust me, I've been there with my old Stihl MS 170. Starting a Stihl chainsaw doesn't need to be a workout if you know the dance steps. Below is everything I've learned through years of cutting firewood and battling stubborn two-strokes.
Let's get this out upfront: I once flooded my saw three times in a row trying shortcuts. Rushing leads to frustration. These machines demand respect.
Safety Stuff You Absolutely Can't Skip
Look, I get it. You just wanna cut that tree. But skipping safety is how my neighbor ended up with seven stitches. Your hands aren't replaceable.
Essential Gear Before Pulling the Cord
- Chainsaw chaps (Kevlar-lined ones saved my leg last winter)
- Steel-toe boots - That falling branch won't care about your sneakers
- Eye protection - Wood chips hurt like hell at 60mph
- Hearing protection (Those little foam plugs actually work)
- Gloves with grip - Sweaty hands slip
| Safety Mistake | What Happens | How to Avoid |
|---|---|---|
| No eye protection | ER visit from wood chips | Wear goggles every single time |
| Loose clothing | Gets caught in chain | Wear fitted layers |
| Working alone | No help if injured | Always have someone nearby |
Pre-Start Checklist: Don't Be Like Me
That time I forgot the chain brake? Yeah, the kickback nearly took my nose off. Run through this list religiously:
- Chain tension - Lift a link midway on the bar. Should snap back, not sag. Too tight overheats the engine.
- Bar oil level - Running dry destroys bars ($80 mistake I made twice!)
- Fuel mix - 50:1 gas/oil ONLY (Stihl's Silver bottle oil prevents carb gunk)
- Chain brake engaged - The big lever front of handle must be pushed forward
- Clear work area - Tripping over branches while starting? Bad idea.
Pro tip: Store your mix in a metal can. Plastic gas cans degrade and clog your carburetor - learned that after rebuilding mine.
The Actual Starting Process: Cold Engine
Here's where most folks mess up. How to start a Stihl chainsaw correctly depends on engine temperature. For cold starts:
Step-by-Step Walkthrough
Position the saw: Left hand on front handle, right foot through rear handle. Pin it down.
- Activate choke - Push lever all the way down (Position ★)
- Press fuel primer bulb 5-8 times - Watch fuel flow through clear lines
- Pull starter cord slowly until resistance - This is the "compression stroke"
- Yank cord sharply upward - Don't strangle the handle; use a smooth motion
Listen for the engine to "pop" within 3-5 pulls. That's your cue!
- Move choke to half-throttle position (Position ▲)
- Pull cord again - Should start within 1-2 pulls
- Immediately blip throttle to disengage choke
Let it warm up 30 seconds before cutting. Revving cold engines wears piston rings.
Warm Start Shortcuts
If you've just turned it off? Skip the choke drama:
- Set master control lever to half-throttle (▲)
- One firm pull usually fires it up
- No priming needed unless it sat >10 minutes
| Symptom | Cold Start Fix | Warm Start Fix |
|---|---|---|
| Silent after 5 pulls | Check choke position | Try full choke briefly |
| Starts then dies | Move choke to ▲ faster | Clean spark arrestor |
Why Your Saw Won't Start: Diagnostic Table
My MS 250 refused to start for a week last spring. Here's what I learned troubleshooting:
| Problem | Likely Cause | Solution |
|---|---|---|
| Pulls too easily | No compression | Check spark plug tightness |
| Pulls extremely hard | Flooded engine | Remove plug, dry cylinder |
| Starts but dies | Clogged fuel filter | Replace $5 inline filter |
| No spark | Faulty ignition coil | Test with multimeter |
| Fuel leaking | Cracked fuel lines | Replace all rubber lines |
Old fuel is the #1 culprit. If your mix is over 30 days old, dump it. Ethanol attracts water and wrecks carbs.
Model-Specific Quirks to Know
Not all Stihls start the same! From my experience:
- MS 170/180: Needs exact choke sequence. Floods easily.
- MS 250/261: Decompression valve helps (that little button near spark plug)
- MS 500i (fuel injected): No choke! Just set to start position and pull.
The decomp valve deserves special mention. Press it BEFORE pulling on bigger saws (>50cc). Reduces pull force by 40%. But if your saw starts then dies immediately, check valve seals - mine failed after five years.
Essential Accessories That Actually Help
Wasting money on gadgets? Been there. These are worth it:
- Stihl Easy2Start: Spring-assisted starter (saves your shoulder)
- Mityvac fuel tester: Checks fuel pressure for $25
- Carb adjustment tool: For fixing lean/rich mixtures
- Quality fuel can: No-spill type prevents stale gas issues
Avoid "universal" starter ropes. They fray faster. Buy OEM Stihl replacement kits.
Maintenance to Prevent Starting Nightmares
That MS 170 that sat all winter? Took me two hours to revive it. Monthly upkeep prevents this:
- After each use: Clean air filter (tap out debris)
- Every 10 hours: Check chain sharpness and tension
- Every 20 hours: Replace fuel filter
- Off-season: Drain fuel completely or use stabilizer
Never store with fuel in the carburetor! Gummed-up jets will ruin your next project. Run it dry before storing.
FAQs: Real Questions from My Workshop
Why does my Stihl chainsaw only start with full throttle?
Usually indicates an air leak. Check intake boots and crankshaft seals. Had this on a used MS 361 - $15 seal fixed it.
Can I use regular motor oil for bar oil?
Technically yes, but it slings off faster. Proper bar oil has tackifiers. I tried 10W40 once - leaked everywhere.
How many pulls should a cold start take?
Properly tuned: 3-5 pulls max. More than 8? Something's wrong. My new MS 400 C starts in two pulls consistently.
Why does it smoke excessively on startup?
Normal for first 30 seconds if stored vertically (oil enters cylinder). Persistent smoke means bad crankcase seals.
When to Call a Professional
Despite YouTube tutorials, some jobs need a tech:
- Engine disassembly required
- Crankshaft bearing replacement
- Ignition module failures
- Carburetor replacements (unless you enjoy tiny springs)
My local shop charges $85/hour. Weigh that against DIY frustration. For basic starting issues though? You've got this.
Final Reality Check
Learning how to start a Stihl chainsaw reliably takes practice. My first season? Constant flooding and blisters. Now I can start any model blindfolded. Follow these steps, respect the machine, and remember - sharp chains and fresh fuel solve 90% of problems. Now go cut something safely!