Honda HHH25D and HHH25S

When it's running it sounds more like a mower than a hedgetrimmer — that's the GX25 mini four-stroke behind the HHH25 series from Honda.

The company has designed a lubrication system that enables the engine to operate at any angle. The tester rotates the HHH25D through 360? to test it. It keeps running.
And, before you ask, yes they have power and speed. Maximum engine speed is 11,500rpm. Engine acceleration to full speed is 0.7 seconds — a feature made possible by weight reduction in the rotating parts such as the flywheel, plus the inclusion of Honda’s carburetter — equipped with acceleration pump. A good finish is achieved on both the privet hedges in the test.
Starting is easy. These machines have an exhaust-side decompression mechanism to keep the energy needed to start the motor to a minimum. We also like the idea that they run on unleaded petrol.
But what about the weight associated with four-strokes? It’s true these models weigh more than the others in the test. It’s not a huge amount, although that little extra weight is noticeable after a while. Offsetting the weight, of course, is the extremely small amount of pollutants — Honda claims 90 per cent less than conventional two-strokes — lower noise and low vibration levels. Good for the private gardens.

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