’67 Sears Puch Twingle
Apparently I am on a Sears Allstate kick this week. I found another Sears motorcycle that is really interesting and has a huge potential for being so cool to ride. A Puch 250 Twingle. As I look back at bikes that I have wrote about, a couple of ‘Twingles’ have come up. This time I did a bit, actually a lot, more research of this design. While I don’t want to burden you with all that I found scouring the internet and friends for information, there are a few little nuggets here.
The basics of the ‘Twingle’ design are two pistons sharing a common combustion chamber, one piston handles the intake, the other the exhaust. This design was patented back in 1912 by Alberto Garelli and first put to use in a Garelli 346cc motorcycle. Well, then World War One hit and most all production went to weapons. In 1923 Puch started using an asymetrical port timing, it’s complicated and I can’t really explain it all that well, but it really made the difference in the performance of the bike. Basically, more power (?) and seriously better gas mileage.
The design was successful and in 1931 Puch won the German GP with the split single model. Because of Puch’s success, other manufacturers took up the design, particularly DKW, from there DKW was the dominant force in that design.
Next up was another World War and again motorcycle production shifted to military use. After the war Puch modified the original Split Single design by moving the intake to the front of the engine just under the exhaust. Interestingly, Yamaha a few years ago reversed the intake and exhaust on their motocrossers most thought it was revolutionary but,actually a sixty year old concept/design.
Those of us that have ridden two strokers forever remember the days of pre-mixing and what a pain it could be. Thanks to Puch, oil injection came to the world. Puch put an oil pump system into the gas tank, note the two filler caps, and made gassing up your two stroke 250 easier.
The Puch/Sears Twingle was produced up into the late Sixties but by that time it was way behind, (performance wise), Japanese speedsters like the Suzuki X6, the Kawasaki Samurai and even the lowly little Honda CB160. Styling was a bit dated, Puch took it’s cue’s from the older Honda Benly, pretty conservative looking.
So, I found this neat little Sears Twingle on ebay today and looks to be a great platform for a cool cafe racer or even an awesome vintage racebike It’s a nice condition ’67 Sears Twingle that runs well and really doesn’t need all that much to look nice as well. I also found a really good source parts source for this motorcycle, check out www.motorwestmotorcycles.com. Click on the pics below for more info and more pictures.