Date of publication: 16-04-2017
Initially, the winter frame was designed under Rotax, but decided to put and test the four -stroke, for the start is important in winter, and the moment “from below” is important. The frame accepted the engine easily, the necessary transverse weightlifting was achieved by a slight displacement of the seat to the left, and the “excess” weight of the motor compared to the two -strokes even allowed the loading of the rear wheels without displacement of the seat back and choose the most convenient landing.
After almost 3 months of the forced “downtime” in the offseason (while the frame was preparing), the engine started in 5 minutes, it was necessary to simply twist a little on a turned candle and then run. Sound – just amazing!!! The uterine “Ryk” easily blocked the loud “screech” of the neighboring two -strokes. Start, as expected, did not disappoint. The first 2-3 seconds of cards, despite the extra 10 kg of mass, simply left the rotaxes, although it was no longer felt by the release of 7-8 thousand of the difference. An excess of power is affected here, which in winter is not easy to realize – there is not enough hook. A sharp press on the pedal – and the cards are slipping on a straight line regardless of speed. Only 250 cup two -strokes behave similarly, among which I had to ride.
From the features of winter operation. Antifreeze is required in the radiator. Used “REDENOL”, diluted as expected for “ordinary” engines. Even if the cards are working on idle, the heat is not enough and the interception can occur in the tube leading from the radiator (by the way, it had to be blocked on?, to provide the desired temperature). The axis used 25, but it would be better to be a powerful motor just oppressed the weak axis, and the increased weight also helps it, which is why when you exit the turn (where you already crush gas) on a bump or a chain flies when hit. Therefore, the lifting after each race is required. A more powerful axis solves the problem.
A feature in the behavior of the car is the free choice of the trajectory. You can “slowly” at the turns of close to idle in the lowest radius, and the lower point will make it possible to leave on the exits on an equal footing. This really helps in overtaking. In the races, he launched cards so that the muzzle went 10 centimeters from the inner parapet. Sensations are similar to rolling 4 tactics – how much you give gas, according to such a radius and you will go. A little granted (without even twitching the steering wheel) – the car is wider, when I let it go – I went into the turn.
In general – satisfied. But there are conclusions. Firstly, a different frame is required for the car than for a two-stroke, with a tougher back and a softer front. Secondly, there is clearly a lot of motor, you can forcibly limit the power of at least up to 25-30 liters. With., without noticeable loss in dynamics to avoid mistakes.