-
Enjoy XS650.com? Consider making a donation to help support the site.
XS650.com receives a small share of sales from some links on this page, but direct donations have a much greater impact on keeping this site going.
Interesting motorcycles, not XS650
- Thread starter Kevin Werner
- Start date
The highly innovative Puch / Allstate 250cc twin piston single or “twingle”
“The advantage of the split-single engine compared to a conventional two-stroke engine is that the split-single can give better exhaust scavenging while minimizing the loss of fresh fuel/air charge through the exhaust port. As a consequence, a split-single engine can deliver better economy, and may run better at small throttle openings. A disadvantage of the split-single is that, for only a marginal improvement over a single-cylinder engine, a split-single engine is larger, heavier and more expensive. Since a manufacturer could produce a conventional two-cylinder engine at similar cost to a split-single engine, a two-cylinder engine is usually a more space- and cost-effective design.”
With the carburetor on the side of the cylinder, it intakes fuel mixture in one cylinder and exhausts out of the other.
The Puch company was founded as a bicycle manufacturer by Austrian Johann Puch in 1903. They also began producing motorcycles , cars and scooters. By 1957 the company starting selling Puchs in the USA under the Allstate and Sears names, including the Sears 250 SGS Twingle.
With the carburetor on the side of the cylinder, it intakes fuel mixture in one cylinder and exhausts out of the other.
I love the air filter housing that doubles as the choke, you simply rotate the housing to close off the openings to choke the carburetor. ( which also has a tickler button like Amals )
I think they are a very classic looking bike with a very unique look, I even like the enclosed drive chain. You can hear one run here,
Puch was also very successful in racing.
In 1974 Puch hired Belgian motocross rider Harry Everts to race the 250 World Championships on a new machine. Everts finished third in Puch’s first year, and the factory responded with a much-improved machine for 1975. Everts then promptly rewarded Puch with its first World Championship in motocross. This machine was very advanced for its time with top shelf suspension, extensive use of magnesium and a truly unique intake system that utilized two carburetors for the single piston engine. One carburetor fed traditional two stroke ports and the other carburetor fed into a rotary intake system. As seen here,
Puch was also competitive in Grand Prix road racing
and International Six Day Trials
“The advantage of the split-single engine compared to a conventional two-stroke engine is that the split-single can give better exhaust scavenging while minimizing the loss of fresh fuel/air charge through the exhaust port. As a consequence, a split-single engine can deliver better economy, and may run better at small throttle openings. A disadvantage of the split-single is that, for only a marginal improvement over a single-cylinder engine, a split-single engine is larger, heavier and more expensive. Since a manufacturer could produce a conventional two-cylinder engine at similar cost to a split-single engine, a two-cylinder engine is usually a more space- and cost-effective design.”
With the carburetor on the side of the cylinder, it intakes fuel mixture in one cylinder and exhausts out of the other.
The Puch company was founded as a bicycle manufacturer by Austrian Johann Puch in 1903. They also began producing motorcycles , cars and scooters. By 1957 the company starting selling Puchs in the USA under the Allstate and Sears names, including the Sears 250 SGS Twingle.
With the carburetor on the side of the cylinder, it intakes fuel mixture in one cylinder and exhausts out of the other.
I love the air filter housing that doubles as the choke, you simply rotate the housing to close off the openings to choke the carburetor. ( which also has a tickler button like Amals )
I think they are a very classic looking bike with a very unique look, I even like the enclosed drive chain. You can hear one run here,
Puch was also very successful in racing.
In 1974 Puch hired Belgian motocross rider Harry Everts to race the 250 World Championships on a new machine. Everts finished third in Puch’s first year, and the factory responded with a much-improved machine for 1975. Everts then promptly rewarded Puch with its first World Championship in motocross. This machine was very advanced for its time with top shelf suspension, extensive use of magnesium and a truly unique intake system that utilized two carburetors for the single piston engine. One carburetor fed traditional two stroke ports and the other carburetor fed into a rotary intake system. As seen here,
Puch was also competitive in Grand Prix road racing
and International Six Day Trials
The specific PUCH layout is new to me. But I did know of some oldtime 2 strokes that used two slugs on one crank to supercharge...see> Excerpt)> The Puch U-shaped conrod was heavy and unsuitable for the sustained high revolutions expected of a racing engine, so in 1931 DKW engineer Arnold Zoller refined the concept with a master/slave conrod design. There was a single crankpin for both rods, with the exhaust piston connected directly to the crankpin by the “master” rod, while the intake side piston was controlled by a “slave” conrod." and so forth> https://www.odd-bike.com/2014/02/dkw-supercharged-two-strokes-force-fed.html Many picture.
Interesting…I had remembered hearing about twin piston singles back in the 70’s, but I never really tried to understand how they worked until today. They were just exotic curiosities to me.
But I think they are actually pretty interesting.
Wow! DKW really went to town with the supercharging variants.
Last edited:
Yeah. Me too!
Yeah. Me too!Interesting…I had remembered hearing about twin piston singles back in the 70’s, but I never really tried to understand how they worked until today. They were just exotic curiosities to me.
But I think they are actually pretty interesting.
Wow! DKW really went to town with the supercharging variants.
View attachment 240873View attachment 240875View attachment 240876View attachment 240877
Properly this is a truck engine. “Commer Knocker” Opposed piston 2 stroke diesel with one crank and a whole buncha rockers...but it's cool> Also history. https://www.enginebuildermag.com/2014/10/ferraris-flat-twelve-dyno/ It's so cool, and so forgotten, if there's a proper thread fellas, say what. But enjoy the TS-3! (I understand that these were wonderfully noisy!)
Puch sold a lot of Mopeds 50 cc in the 60 -- 70 ies
Needed to be 15 years old
and are popular among enthusiasts today divide kr with 10 and get approximate US $
Today on the web Tradera
I don't know why they are so expensive but they are .And Old blokes go in groups on them having a good time
They were restricted in speed But was sometimes tuned some claimed 90 km / h on some 50 cc.
That tuning was illegal
words like " jack in the piston " " Adjustable jet " and getting problems with the law .
One friend had a White Jeans jacket and was ordered by the police to dismantle I believe the carburetor at the town road
Getting a dirty jacket and hands ---And .When nothing wrong The Police or should I say Pigs just left.
I believe today they are faster . Electronically managed and customers demanding the shop to kick in a faster mode .
Or no deal .. buddies otherwise leave him the son behind.
:And i remember reading one speeding .Chased by the Police ..
Getting stopped .. Sometimes back in the day could look funny a big Police Officer test riding the small moped in town.
Heard of Switches making that test ride impossible and Read in the Newspaper after one Youngster speeding at the
footpath. Had a remote control ..as key fob or Remote for the TV set .Getting stopped + 60 km /h. 50 only for cars and less in many areas .. .Pushing the button getting a limp mode .. I don't know how they found out. Perhaps. in The factory shop accessory package
Zundapp was well know for having accessories engine parts available from Germany and was tuned a lot Asking $ 6500
below
Difficult to understand ,,but there is market
Needed to be 15 years old
and are popular among enthusiasts today divide kr with 10 and get approximate US $
Today on the web Tradera
I don't know why they are so expensive but they are .And Old blokes go in groups on them having a good time
They were restricted in speed But was sometimes tuned some claimed 90 km / h on some 50 cc.
That tuning was illegal
words like " jack in the piston " " Adjustable jet " and getting problems with the law .
One friend had a White Jeans jacket and was ordered by the police to dismantle I believe the carburetor at the town road
Getting a dirty jacket and hands ---And .When nothing wrong The Police or should I say Pigs just left.
I believe today they are faster . Electronically managed and customers demanding the shop to kick in a faster mode .
Or no deal .. buddies otherwise leave him the son behind.
:And i remember reading one speeding .Chased by the Police ..
Getting stopped .. Sometimes back in the day could look funny a big Police Officer test riding the small moped in town.
Heard of Switches making that test ride impossible and Read in the Newspaper after one Youngster speeding at the
footpath. Had a remote control ..as key fob or Remote for the TV set .Getting stopped + 60 km /h. 50 only for cars and less in many areas .. .Pushing the button getting a limp mode .. I don't know how they found out. Perhaps. in The factory shop accessory package
Zundapp was well know for having accessories engine parts available from Germany and was tuned a lot Asking $ 6500
below
Difficult to understand ,,but there is market
I confess to Ostalgie. And observe what Herr Victor Grossmann says about the DDR, not great, but pretty good, considering. And they built very nice bikes!
Thanks for the pictures, Brother.
Thanks for the pictures, Brother.
A DIRTY BOXER NO LESS:
More here: https://www.bikeexif.com/bmw-r100-e...ff372a753_640xauto.jpg&utm_campaign=BEX230420
More here: https://www.bikeexif.com/bmw-r100-e...ff372a753_640xauto.jpg&utm_campaign=BEX230420
Does it matter at all that I have a friend who is restoring a Yankee 500 twin, pistons go up and down together?
Traub, worth googling for the story!
Ah dunno... Has RC116 been mentioned already?
Factory racer 50 cc 115 mph...has aspects of oldtimeystuff...as in bicycle aspect.
Factory racer 50 cc 115 mph...has aspects of oldtimeystuff...as in bicycle aspect.
I can smell the castor oil...
In case you didn't make it to the current owner's website, there's all kinds of similar stories here https://wheelsthroughtime.com/
They do a hell of a presentation, including the Traub: happened to be there one year on "Drawing Day" and heard the old beast run. Dale (rip) had solved several mysteries about its creation by German immigrants and IIRC their subsequent issues related to WWI....
I saw that bike at Maggie Valley. Dale himself may have told me the story.
Gary, I had read somewhere about Traub. A one off it seems.
Anybody do Velocette yet?
Couple of years ago returning over hwy 36 from Samoa "Bikes to Bay" I chanced to meet several interesting people and have a long and pleasant dialogue with a group ride of Velocette people...there must have been 50 bikes...all Velocettes, rigids, swing-arms, the bikes have a sound all their own, hear it and know what it is a mile away. They were closing up a very strung out group ride, stopped in a little park...actually a public shooting range, albeit closed., by a creek, college kids skinny dipping a bit away, and hot as hell.
and on the way to Samoa...
Camping on a cold creek sandy beach in 105 degree heat in coastal mountain forest, and having spliced the main brace rather well, I was awakened by two fellas speaking what sounded like Ruski. They were Serbs from Macedonia, cultivating some sort of plant... They began getting me wasted all over... Serbs can drink ordinary men right under the table...we 3 slugging hooch standing up to our knees in ice water flowing. They showed me pictures of their families back home. I've forgotten the Macedonian they tried to teach me. Wonderful men, full of life and vigor and kindness, devout too in the Eastern Orthodox way...but not the men you want to fight..like bears. They had wives of stunning beauty, and many children. The nazi armies never subdued Macedonia... I saw why that was. You meet all sorts, eh? Actor Sterling Hayden was with OSS in the war, and ran guns accross the Adriatic to the Macedonian commies, Tito an' that stuff... He did learn Macedonian, and even joined Commie Party in Hollywood...which turned out to have been a mistake... aheemmm. Stuff we collect!
Anyway>
Anybody do Velocette yet?
Couple of years ago returning over hwy 36 from Samoa "Bikes to Bay" I chanced to meet several interesting people and have a long and pleasant dialogue with a group ride of Velocette people...there must have been 50 bikes...all Velocettes, rigids, swing-arms, the bikes have a sound all their own, hear it and know what it is a mile away. They were closing up a very strung out group ride, stopped in a little park...actually a public shooting range, albeit closed., by a creek, college kids skinny dipping a bit away, and hot as hell.
and on the way to Samoa...
Camping on a cold creek sandy beach in 105 degree heat in coastal mountain forest, and having spliced the main brace rather well, I was awakened by two fellas speaking what sounded like Ruski. They were Serbs from Macedonia, cultivating some sort of plant... They began getting me wasted all over... Serbs can drink ordinary men right under the table...we 3 slugging hooch standing up to our knees in ice water flowing. They showed me pictures of their families back home. I've forgotten the Macedonian they tried to teach me. Wonderful men, full of life and vigor and kindness, devout too in the Eastern Orthodox way...but not the men you want to fight..like bears. They had wives of stunning beauty, and many children. The nazi armies never subdued Macedonia... I saw why that was. You meet all sorts, eh? Actor Sterling Hayden was with OSS in the war, and ran guns accross the Adriatic to the Macedonian commies, Tito an' that stuff... He did learn Macedonian, and even joined Commie Party in Hollywood...which turned out to have been a mistake... aheemmm. Stuff we collect!
Anyway>
Attachments
Last edited:
