Aermacchi Trial 250

built by Walter Traber

TWN Club Member Walter (age 50+) is not only a several times finisher of SSDT, but also racing in several disciplines as scooter race, Trottinet, Dragster, etc

Since two years he became infected by the Twinshock virus, a very bad desease. Makes you dreaming about old twinshock bikes, nobody else is owning and competing with them.

So, he transformed an Aermacchi Ala Verde street 4 stroker into a Trials motorbike. The Ala verde started production about 1959 - 1972, so should be eligible for Pre 65 Trials.

Aermacchi Ala Verde, 250cc, max speed 140 km/h

Aermacchi was an airplane factory and also started to produce motor bikes in 1948. In the early 70ies, the motor bike division was sold to Harley Davidson.

With the small OHV engine, many road races were won in the lower cc classes, because of the low weight distribution of this construction.

Here a ready to race version from Swiss tuner Liengme

And now Walters construction, Aermacchi 250cc Trial.


main frame original, tubes and slide plate under the engines added in background: Walter is discussing improvements with Daniel	nice inox exhaust, 4 stroke 250cc

steepter swing arm, TY 125 wheels and front fork	the 250cc engine

left side of the beast, airfilter made of an empty oil bottle	ground clearance looks ok for a Pre 65

Walter proudly presents his Aermacchi 250 on his first test day

Why this project? Walterbought the Aermacchi in the 80ies and was using it as a street bike. Then it remained unused in his garage. He already saw Trial bikes from Guzzi, Gilera, Bianchi, but no Aermacchi.

So why not be the first (or one of few) to built and compete with?

Ok, it is working, but needs improving, as it was a street bike. The test day at the Clubtrial in March 2011 revealed some problems with the power delivery.

Tests with other carbs are planned.

Next big event is to be Trial Caglio, back to the country of origine Italy.

I hope he can be ready in few weeks...

(to be continued)