Specification: Warranty: yes (2 years) , 2 or 4 stroke: 2 stroke , Engine power: 0.6 kW , Weight: 3.9 kg The 2 stroke engine is easy to start, powerful and not too noisy, it hardly ever gets bogged down because of the power. The build quality of this petrol strimmer / brush cutter is surprisingly good for something priced so low. Everything feels strong and well-made and should last a while as long as it is not abused. Some trimmers have what are known as “wrap-around handles” that allow you to rotate and hold the trimmer at various angles, making it easier and more comfortable to use. Safety

Run fresh fuel through the system with an additive applied. If you’ve previously used old petrol or low quality fuel, flushing it out can help the motor to run more smoothly. Sprouse III, Charles; Depcik, Christopher (1 March 2013). "Review of organic Rankine cycles for internal combustion engine exhaust waste heat recovery". Applied Thermal Engineering. 51 (1–2): 711–722. doi: 10.1016/j.applthermaleng.2012.10.017. The Hyundai HYPT5200X is a 52cc long-reach petrol hedge trimmer with strong cutting power on tall, hard-to-reach hedges. When fully extended, it can reach from two to three metres and can be increased with the one-metre extension shaft that is included. Most modern production engines use hydraulic lifters to automatically compensate for valve train component wear. Dirty engine oil may cause lifter failure.An internal combustion engine is on average capable of converting only 40-45% of supplied energy into mechanical work. A large part of the waste energy is in the form of heat that is released to the environment through coolant, fins etc. If somehow waste heat could be captured and turned to mechanical energy, the engine's performance and/or fuel efficiency could be improved by improving the overall efficiency of the cycle. It has been found that even if 6% of the entirely wasted heat is recovered it can increase the engine efficiency greatly. [8] Assembly wasn’t the easiest, the instructions forget to mention removing a rubber band so you can fit the handle, and this might frustrate some people, but it takes less than 30 seconds to rectify.

Another thing Makita has done is use sporty ventilated shoulder straps. This ensures that you don’t get too sweaty after using this petrol leaf blower for extended periods. If the hedges you intend to trim are 6ft or less high, then a standard petrol hedge trimmer will be more than adequate. Long-reach Petrol Hedge TrimmerThe not so great things that you have to put up with when using a petrol strimmer are extra maintenance and running costs. You will need to make sure you have a can of petrol on hand and you will also need oil to keep the motor lubricated and to change spark plugs and such from time to time.

Fueling: a 2-stroke engine must be fueled with a mixture of petrol and oil, which must be mixed externally to the fuel tank. The ratio of fuel to oil is generally about 50:1, although the manufacturer will specify how much of each to use for their given engine. On the other hand, 4-stroke engines take fuel and oil separately, like a car. The 33cc motor is a single-cylinder, air cooling, 2 stroke engine that is started via a recoil system and produces 1.2 HP. This power makes clearing out tough weeds a piece of cake as you would expect from a petrol strimmer. The HHH 25D 75E is fitted with one of Honda’s 25cc mini four-stroke GX25 petrol hedge trimmer engines and is one of the first four-stroke petrol hedge trimmers on the market. Turbocharging allows for more efficient engine operation because it is driven by exhaust pressure that would otherwise be (mostly) wasted, but there is a design limitation known as turbo lag. The increased engine power is not immediately available due to the need to sharply increase engine RPM, to build up pressure and to spin up the turbo, before the turbo starts to do any useful air compression. The increased intake volume causes increased exhaust and spins the turbo faster, and so forth until steady high power operation is reached. Another difficulty is that the higher exhaust pressure causes the exhaust gas to transfer more of its heat to the mechanical parts of the engine. To sum it up, you need a lawnmower for doing the brunt of the heavy work and a strimmer for tidying and polishing the final look of your lawn.Clean the fuel filter – it might be clogged up with gunk if the mower is more than two years old. You can wipe any dirt or debris off and then spray the filter with a cleaning product, or you can replace the fuel filter completely. As tools go, strimmers are up there with the most useful and versatile, plus, both the cost of purchasing and maintaining a petrol strimmer is pretty low.