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A German test

 

P7

The acceleration is marvellous for a quarter litre machine.  By quick shifting through the gear range the MB250 reaches 60kp/h in 5 seconds, ten seconds to 80kp/h and twenty seconds to 100kp/h.  the highest speed lay at 112kp/h with this test.  In other tests it was measured repeatedly at 116.5kp/h.

The exemplary spacing of the gears leaves nothing to be desired.

and also the documentation from the factory nominates (with embarrassment) a value of 5.75 = 1, which corresponds to the compression value at the exhaust port point. 

A high compression ratio in the case of a two-stroke means, when it is healthy in other ways, only a very noticeable thermic relief of the exhaust area and with that, better concentric stability of the cylinder.  In fact the MB 250 has a total compression ratio of 7.8:1 to 8.0:1.  Therefore even with normal petrol under the strongest uphill load or under acceleration it shows not the slightest inclination to ring.

The impressive maximum speed, which, in spite of many doubts, represents an undisputed performance benchmark, and which here proves very obviously that the low rider-seat and, as a consequence, the slightly stooped position giving a reasonably noticeable lowering of the area of resistance, is not the strongest impression of the test.

Even more convincing is the very exceptional acceleration for a quarter-litre machine , which by appropriate use of the gears, can keep up with most half-litre machines.  From a standing start, 80 km/h is achieved in 10 seconds and 100 km/h in 20 seconds, when one drives the gears out to a good 6000rpm.  That is 35 in the first, 60 in second and 85 in the third.  Here becomes evident the excellent torque of the MB 250, the peak of which with 2.14mkg at 5200rpm lies somewhat high, which between 4000 and 5800rpm, however, stays over 2mkg .

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