Is your lawn mower refusing to start after a Perth winter? You’re not alone! Cold mornings, leftover humidity, and months of sitting idle can leave your mower stubbornly silent when you need it most.
The good news? Most winter-related starting problems are easy to fix yourself. In this guide, I’ll walk you through the 5 most common reasons your mower won’t start post-winter—and exactly how to solve them without calling a repairman.
Why Perth Winters Are Tough on Lawn Mowers
Before we dive into fixes, let’s talk about why this happens. Perth’s “winter” might not be freezing, but the combo of:
Morning dew + humidity → corroded spark plugs & stale fuel.
Long inactivity → gummed-up carburetor from old petrol.
Cool nights → thickened oil making the engine harder to turn over.
Sound familiar? Let’s get your mower roaring back to life.
Fix #1: Check the Fuel System (90% of Winter Starting Issues)
Problem:
Old fuel is the #1 culprit. Petrol starts breaking down after 30 days, turning into a sticky varnish that clogs your carburetor and fuel lines.
Solution:
Drain the old fuel (if it’s been sitting since April, it’s garbage).
Tip: Use a siphon pump to avoid spills.
Add fresh, ethanol-free petrol (WA’s United Petroleum sells it—ethanol attracts moisture).
Still not starting? Clean the carburetor:
Remove the carb bowl (YouTube has tutorials for your model).
Spray carb cleaner through the jets (wear gloves!).
Pro Tip for Next Winter: Add a fuel stabiliser (e.g., STA-BIL) before storing your mower.
Fix #2: Test the Spark Plug (The Silent Killer)
Problem:
A fouled or corroded spark plug won’t ignite the fuel—especially common after humid Perth winters.
Solution:
Pull out the spark plug (use a socket wrench).
Check for:
Black, oily residue → Clean it with a wire brush.
White crust (corrosion) → Replace it ($10 at Bunnings).
Test for spark:
Reconnect the plug, hold it against the engine (don’t touch metal!).
Pull the starter cord—you should see a blue spark. If not, buy a new plug.
Perth Hack: Keep a spare spark plug in your shed—they fail often here!
Fix #3: Inspect the Air Filter (Blocked = No Start)
Problem:
A clogged air filter starves the engine of oxygen. Dust + winter moisture turn it into a brick.
Solution:
Locate the air filter (usually under a plastic cover).
If it’s paper: Tap out debris or replace it (5–15).
If it’s foam: Wash it in soapy water, dry fully, and add 2 drops of oil.
Warning: Never run the mower without a filter—Perth’s dust will destroy the engine!
Fix #4: Check the Oil (Thick Oil = Hard Starts)
Problem:
Cold mornings thicken the oil, making the engine harder to turn over.
Solution:
Check the dipstick—oil should be amber, not black or milky.
Drain and replace if:
It’s been >6 months.
Looks like a “chocolate milkshake” (water contamination).
Use SAE 30 oil (best for Perth’s climate).
Pro Tip: Store your mower on a level surface to prevent oil leaks.
Fix #5: Safety Switches & Battery Issues (For Electric Mowers)
Problem:
Electric mowers? Dead batteries or tripped safety switches (common after long storage).
Solution:
Charge the battery fully (even if it “seems” charged).
Check the safety key (yes, it’s obvious—but 20% of “repairs” we do are just this!).
Reset the circuit breaker (tiny button near the motor).
Still dead? Bring it to us—we test battery health for free!
When to Call a Pro (Perth’s Lawn Mower Repair Experts)
If you’ve tried all 5 fixes and your mower still won’t start, it might be:
A seized engine (from lack of oil).
A broken starter cord (common in older mowers).
Fuel pump failure (rare, but happens).
We offer mobile repairs across Perth—book a same-day service here.
Winter Storage Tips for Next Year
Run the tank dry or add fuel stabiliser.
Change the oil before storing.
Store indoors (or under cover—Perth’s UV kills mowers).