Comments on: 1950 TWN BDG Barn Find

By: Hans Juergen Kahler

Hans Juergen Kahler — Thu, 03 Sep 2015 11:11:55 +0000

The post-war TWN (Triumph) 125, 250 and 350 Boss were all twin piston models with a common combustion chamber. That is why they were not call “two cylinder” or “twin cylinder”.
They had a forked con rod, meaning the two pistons were positioned side by side.
I don’t know whether the TWN (Triumph) scooter had the same sort of engine.

In the Austrian Puch “twin piston” models (125, 175, 250 cc) the pistons were in tandem positions and the con rod had a hinged rear segment for the rear piston. The earlier models (TF250) had only one spark plug, SG and SGS had twin spark ignition. The Puch 150 cc scooter did have only a single piston engine.

By: Bernie Stevens

Bernie Stevens — Tue, 17 Mar 2015 18:01:25 +0000

Hi there, great bike to find in that condition!just clean it and oil it,just one more point, as regards to the name, because of the English copyright laws, only English Triumph’s when exported can still carry the name Triumph! In Germany, German made Triumph’s still carry the name,but when they were exported were named TWN (Triumph Werke Nurnberg) and that all the name changing took place in 1923. see more on my web site about TWN/Triumph.
regards Bernie.

By: Michael

Michael — Sat, 07 Mar 2015 10:14:36 +0000

I would advise you to keep it original. Restoring it will only destroy the original paint and patina, and give nothing. Original is always best.