I’m a mechanic for over twenty years and I see the same symptoms again and again. If any of these sound familiar, it’s likely you’ve got a fuelling issue.
- Mower won’t start after winter
- Engine hesitates
- Mower losses power
- Engine surging
- Mower starts and then dies
- Engine stalls when cutting grass
- Mower cuts out on a hill
A carburettor is tasked with the job of mixing gas and air to a ratio of 14.7 to 1, known as AFR (Air Fuel Ratio). This ratio is the optimum mix of gas and air. Your mower carburettor may look simple, in fact it’s a finally tuned instrument.
Your carburettor has a brass fuel jet with tiny precise fuel feed holes. If any of these holes get blocked, your engine will hesitate, it does so because it’s not getting enough gas – engine running lean.
This condition apart from begin irritating, is bad for your engine. An engine that runs lean, runs hot.
Dirt in the carburettor is primarily caused by debris entering through the gas tank and stale gas.
Cleaning around the gas tank before opening it will help keep the crap out. But what most people don’t know is that gas now starts to go stale after one month storage.That means your mower carburettor may well have gum and varnish deposits blocking up the tiny port holes and passageways.
Cleaning should fix the problem, but if it’s too bad, just go ahead and replace it.
Using a gas stabiliser in your fuel over the winter months will prevent this happening again.
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