The science behind CWT — or at least the wording on the poster accompanying the MT4000 to the test — is difficult to understand. Put simply, the harmful exhaust gases are used to propel the fuel into the combustion chamber, while only emitting clean air through the exhaust ports. This, says Efco, reduces fuel consumption by 40 per cent and hydrocarbons emissions by 75 per cent.
But, as often happens with developmental technologies, other things may have to give. The Right Burn system does mean that you will want to warm up this saw properly before using it. If you try to use it straight away, then like us, you will probably think it is underpowered. On the first cuts we made on beech, the saw struggled.
Weighing just 4.1kg and producing 2.4hp, the MT4000 has an impressive power to weight ratio. And once it is warm, the high-torque engine provides a good cutting speed. This model is fitted with inertia chain brake and a fine-tooth, low-kickback chain. The “no oil at idle” feature further reduces consumption and prevents burnt oil emissions.
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