If your outboard is suffering from the symptoms of E10 fuel damage (hard starting, rough idling, stalling out when you hit the throttle), you’ve probably tried the classic "can of carb cleaner" approach. You spray it down the throat, you twist the screws, and… nothing changes.
Here is the brutal truth: a standard aerosol spray cannot reach the macroscopic jets and internal fuel passages where the real blockages live. Once old fuel turns into that sticky, green varnish, it is physically hardened inside the tiny channels that control your engine's precise fuel-to-air mixture. To get it breathing right again, you need more than a spray; you need science.
What is an Ultrasonic Clean?
We don't just "soak" your carburettor. An ultrasonic clean is a powerful, industrial deep-cleaning method that uses a heated, specialized cleaning solution combined with high-frequency sound waves to blast grime away from the microscopic internal surfaces of your carby.
How the "Miracle" (Cavitation) Works
It all comes down to a process called cavitation. Here is the breakdown:
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The Waves: A high-frequency generator (transducer) sends powerful, ultra-high-pitched sound waves (which you can only hear as a faint buzz) directly into the cleaning tank.
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The Bubbles: These sound waves create a dramatic low-pressure zone in the heated fluid. This extreme pressure change causes hundreds of thousands of microscopic vapor bubbles to grow rapidly, like invisible pearls.
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The Implosion: When these bubbles reach a critical size, the surrounding fluid pressure becomes too intense. Instead of "popping" outwards, the bubbles violently implode inwards.
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The Scrub: This implosion creates a tiny, focused, and powerful jet of solution (a micro-shockwave) that blasts debris and varnish directly off the metal surface, including the tiniest passages of the main and pilot jets.
Think of it as thousands of microscopic scrubbing brushes working simultaneously inside every single orifice, channel, and circuit of your carburettor, cleaning it in a way that hand-scrubbing can never achieve.
Why It’s the Only Professional Fix
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It Reaches the "Unreachable": It penetrates blind holes, deep threads, and microscopic passages that a standard wire brush or spray can never touch.
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It Restores Flow, Not Just Appearance: A polished exterior doesn’t help you on the water. Ultrasonic cleaning ensures that the internal flow of fuel and air is restored to perfect factory specifications.
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It is Gentle yet Powerful: The process is safe for delicate aluminium housings and brass components (unlike harsh wire brushes or abrasive sandblasting), but it will effortlessly remove rock-hard fuel varnish.
When we pull your carburettor rack from the heated ultrasonic bath, every jet is cleared, and every passage is free to breathe. That is the difference between "spraying" it and "cleaning" it.
The Cavitation Process: Infographic
To visually understand how this deep-cleaning process works, look at this technical diagram. It shows exactly how the imploding bubbles are directed against the varnish, reaching inside the microscopic jets that a spray can cannot.
f you’ve tried a basic clean on your outboard carburetor and the symptoms still haven’t cleared up, it is time for a professional, ultrasonic deep clean. We strip every carby down, run the entire unit through the heated tank, and pressure test it on the bench before you bolt it back on.