Yamaha engines
The engines of the Japanese manufacturer Yamaha are known for their precision, emphasis on quality workmanship and a sophisticated system for sensing all driving parameters in real time so that the assistance system is as natural as possible. This has been the case for many decades, from the first electronic assistance systems, which even in the pioneering days of the 1980s were gaining popularity compared to low-volume combustion engines, to the present day, when e-bikes with Yamaha engines are some of the most sought after for their driving performance at an affordable price. Here we will look at the most common of them, their parameters, comparisons and areas of use.
Yamaha PW-ST
The Yamaha PW-ST engine was announced as a new product for the 2020 season and replaced the previous PW-SE version. The designers managed to reduce weight, modify the design, but the main difference was in the tuning of the control unit with many improvements. Until then, the rather unpleasant jump-off at speeds around the limit of 25 km/h was replaced by smooth modulation, as well as smoother starting even with an unnecessarily heavy gear engaged. The smoother performance was also contributed by the new Quad Sensor technology, where the control unit detects cadence, crank torque, speed and terrain inclination in real time so that immediate assistance is always as accurate as possible. The Yamaha PW-ST engine is subjectively one of the livelier electric motors, which is why it is especially suitable for mountain bikes for sporty riding even in more difficult and technical terrain, even though it has a lower maximum torque than premium engines.
The motor weight is 3.4 kg, the nominal power is 250 W, the peak power is not specified and the maximum torque is 70 Nm.
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Yamaha Pw-S2
One of the things that has been criticized about the best-selling PW-ST is its relatively higher weight, at least compared to its competitor Bosch Performance Line CX. Its revised version PW-S2 was developed in the spirit of Less is sometimes more . Its riding performance is supposed to be very similar to the PW-ST, but thanks to its compact dimensions it offers manufacturers more freedom when integrating it into the frame and saving 500 grams is also not to be missed. It is still a reliable, lively and smooth drive unit, which we are used to from Yamaha.
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Yamaha Pw-x3
The manufacturer's flagship for at least the 2023 season will be its new, redesigned PW-X3 model, marking the 3rd generation of the powerful PW-X sports series. Although the PW-ST and PW-S2 are also known as sports engines with a lively engagement, the PW-X3 takes this expression one step further. Compared to older generations, the engine has been narrowed and equipped with a 128 mm axle, significantly expanding the range of cadences at which the engine works optimally, and maintaining immediate assistance when the pedal is pressed, not when the cranks are turned. As is traditional for the PW-X series, the highest assistance EXPW is the assistance with the highest degree of engine assistance compared to the legs
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Note: Engines such as PW-TE, PW-CE, PW-SE or PW-X2 were not represented by manufacturers on their models, therefore they are not included in the comparison.