250 Sprint/drag special.

[breakwellmz]

You don`t see many of these! -

[Puffs]

Ta for that pic, and I might add: probably for a reason!

The leading link front end is odd, and it might even have a sidecar? Cannot see clearly. Big Bing, no air filter, extended rear end & swingarm. What's with the second pot I see on the other side?

Another MZ racer, this one with a headlight:

[breakwellmz]

No sidecar, no second pot, only one sparkplug. That`s the bumper of the car on the other side not a second exhaust.

[Puffs]

Well indeed, it's a single 250/300, but it could still have a split exhaust header, to breath into 2 expansion exhausts? Would be a great help in increasing the throughput of the header. With that pot I mean this thing:

2nd muffler on RH side.jpg (58.66 KiB) Viewed 1220 times

Which to me looks distinctly like a second muffler on the RH side, not a car bumper.
Btw, here's what seems to be the same bike, but now with a new header & that awkward LH expansion exhaust removed (which makes sense, as I guess it would burn your leg):

On it having a sidecar: see those square tyres, particularly the F one in your pic. Tyres like that will make normal riding difficult. Another indication is the handrail at the rear which, with a seat like that, can only be used by the monkey (= sidecarist). But I'm not sure as we haven’t' seen the RH side of the bike.