Description
Description
Research: 
JEEP's Archives
Motorcycle Magazines
On-Line encyclopedias
News Paper Cuttings/ Scrap Books
My thanks to Lukáš Hromádka and Martijn Stehouwer for their assistance in compiling these pages

We are always looking for contributions to the web page. Please let the web master know if you have any information or pictures for them. If we have used a picture that requires permission please contact us.
Description
Logo
Logo
Logo
Description
Return to Terry Larner JAWA
At this time the factory also produced for the JAWA Company, the 90cc engine, a sporty rotary valved model for the export markets. This Jawa 90 was a simplified version of the Povaszke Strojarne factories special motorsport engine. 
It had the spine frame of the off-road types but was a lower, individual structure for the racer. At the front, instead of pressed steel forks with a swing arm movement it had a 100 mm stroke telescopic fork. The rear spring units have their stroke reduced to 80 mm. Smaller 2.25 x 17 inch wheels and tyres guarantee a significantly lower machine build. 
The water-cooled, reversed cylinder had different port timings between the racers and off-road bikes air-cooled units. It also had the rear facing exhaust port allowing a better shaped expansion system to be manufactured, using the knowledge and skills of Walter Kaaden, and a better fitting within the frame. The cylinder had three transfer ports with the one exhaust port. The 40mm stroke combined with a bore of 39.6mm gave a capacity of 49.76 mm. The engine did not have a starting system and a push start is required. The rotary disc induction system allows the horizontal carburettor to be fitted with a very short suction channel. The dry uncovered clutch is a substantial unit, more than capable of managing the power of the race competition engine. According to the catalogue data, it should have a compression ratio of 14.5:1 and develop 8-9 HP, 14000 rpm, giving a maximum speed: 142 km/h. (Jeep)
TATRAN 50cc and 125cc RACERS
Description
Description
Description
This new motorcycle was designed by Miroslav Špacek, who built three TATRAN racing motorbikes that are now in the museum. 
With this Tatran sport engine, introduced in 1964, a batch of production racers was built in 1965. A chassis of this bike was also produced in a off-road sport motorcycle mode using the same engine.
You can see the entire collection of motorcycles at the Museum of the White Carpathian Region, at the château in the village of Bohunice. The acquisition of the motorcycles was realized with the financial support of the Ministry of Culture of the Slovak Republic.
TATRANOV 50 RS series
TATRANOV 50 RS series
TATRANOV 50 RS  TYPE 104
Having a 6 speed gearbox, a rotary inlet system, and a dry clutch, the engine was very modern for its time. But the chassis was not of a very bright construction. So a lot of race drivers started building their own chassis around the Tatran/JAWA engine. 
To this end, in 1969 Tatran tried to make good their mistake with a more modern frame design for the second type of Tatran production racer. After some re-engineering it was labelled the 'TYPE 104' and as part of the up-grade was given water-cooling to aid the power range.
For off-road bikes, the wheels and brake hubs were from the J-05 model and were used on the racer from the start. The glass fibre laminated race tank has a low sleek profile allowing the rider to fit tight into the bike reducing air resistance. The bike was complimented with a racing seat, frame and a nicely shaped fairing. The engine was the two-stroke, single cylinder, water-cooled. It maintained the suction-controlled rotary disc valve.
Description
Works model of TATRANOV 50 RS  TYPE 104
Description
View
Description
View
Description
View
Description
View
Description
View
Tatran Racing factory - TATRANOV 50 RS  model 104 - racer, owned by Otto Krmícek,  from 1969, This is the first start after renovation.
TATRANOV 50 RS, VMW
A Gallery of Tatran Racing Motorcycle photographs
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Lukáš has been a motorcycle racer and is now a collector of the Tatran bike marque, racing models and an archivist of its history. Currently Lukáš is writing a book in the Czech language about the Racing and Enduro models of the Tatran and the production in the Povazske Strojarne factory of special bikes.
Lukáš Hromádka
Lukáš was Speedway racing for 10 years from 1962 and his first bike on the speedway track was a Jawa two-stroke. Now, for him the fantastic Oldtimer Racing, Motocross, Enduro and Speedway bikes are his love but especially the Tatran 50cc racer.
The following is a collection of messages from Lukáš giving information on the PS factory and the Tatran marque. I have re-written some but have not changed to context.  Lukáš: “My Tatran is an 50cc RS, type 104 water-cooled factory machine, the Bedrich Fenrich machine which he campaigned so successfully.  
“I must state here quite emphatically that the JAWA factory had nothing to do with the creation and manufacture of these motorcycles”. LukášHromádka
"In January 1964, a 50 cc motorcycle engine, with a 5 or 6 speed gearbox was introduced. This engine was developed to have a common road and off-road design. This was the first of the successful TATRANOV 50 RS series. It was air cooled and would have been one of those used in building the 'Larner Jawa'".
These were then made from the design drawings by two people Oldrich Prasil who worked from 1964 until 1969 and one more person named Miroslav Werner (I do not know exactly in what year he came to the factory but he was there until the end of the development department of the road racing motorcycle in 1973. He was also the mechanic of the most famous Czech motorcycle Tatran racer Bedrich Fendrich". 
"The Tatran road racing project was created, as a black or secret project in the development workshop and was started by Oldrich Prasil for their racer Bohumil Kovár, from the Tatran Enduro motorcycle using the 6 gear transmission".
Description
Bedrich Fenrich Please click to go to his page
This is 1 of only three machines made by the Tatran factory, on the left is the factory rider Otto Krmicek and on right, Oldrich Prasil who was the factory mechanic. This man hand built the first air cooled Tatran racer of the same type as the Terry Larner machine in the article”.
Description
View
Description
View
Description
View
"These motorcycles were designed and built in the Povazska Bystrica factory. These machines were designed by the factory’s leading constructor Ing. Zdeno Nagy".
Description
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Description
View
Lukáš Hromádka "These are my castings for my replica Tatran engine which took me 4 year hard work to make !!!! These made a good quality replica crankcase and covers for my Tatran Enduro or Tatran Racer (they are the same crankcase) I built this from using the original factory drawings + original parts"
Description
View
Description
View
Description
View
This gallery of pictures is of the Bedrich Fenrich Tatran engine when Lukáš stripped it for the re-build.
Back to the Factory
Lukas: "Few people know that the Tatran 125cc twin was originally produced by building a Tatran 50cc twin engine but because in 1968 the FIM banned all two-cylinder 50cc engines, this project was not completed, it was ready for the 1969 season in two versions but the engines were destroyed in the factory and there is no picture. Some parts were used on the Tatran 125 Twin. The 50cc motorcycle does not exist but I know there is a chassis and a part of the engine. I have 30% of the drawing documentation from this motorcycle".
Jeep: I have translated the following from a Czech language magazine and I hope it reflects the context of the information that was available. I have made changes and additions for a better read. 
A Czechoslovakian magazine journalist sent us pictures of an interesting road racing machine, which was created recently in the motorcycle factory of Pouazske Strojirny in Slovakia. This is the factory in which the Czechoslovak Manet -Roller was built along with the Tatran motorcycles and racers, and where they are now assembling this bike under the their brand name and that of of Jawa, along with running 50cc, 75cc and 90cc rotary valve two-stroke motorcycles).
Unfortunately, we do not have any further details about the engine and transmission. Only so much has been told to us for example a transistor ignition of Slovak manufacture is being used and the source also finds that the engine will rotate to 15 000 rev/min and that the machine should reach a top speed of 200km/h under favourable conditions. The 18-inch wheels are running with a 2.50 tyre on the front and a rear tyre of 2.70
The company Pouazske Strojirny is based in Slovakia and has supplied engines and complete motorcycles to CZ and Jawa for a number of years. These have been to the customers specifications but with a great amount of development work from the TATRAN Development Department. A large amount of this work has been in improvement and promotion of the customers road bikes but evidently the development work in the sports motorcycle sector is not currently only for the likes of CZ and Jawa:
Description
The two Czech designers Zdenek Nagi and Antonin Hajek are the fathers of this water-cooled two-stroke, twin cylinder. racing machine seen presented here which, as the pictures show, has two rotating disc valves, one on each of the two crank housings with its own single-carburettor control and is consequently, the power control for such two-strokes transmission. 
Description
Description
In the pictures you can also see the ignition system: obviously an AC generator with two separate coils and the transmitter for the plugs which is mounted with the remaining parts of the electro circuitry at the bottom of the high-voltage coils
Description
View
Description
View
It is interesting to note the remarkable similarity in the design of the frame, tank and seat between the 125cc Twin and the Tatran 50cc.
This is an example of the Cold War racers developing their own race bikes from the parts available. This one is using a sleeved down version of the Jawa 90cc motor which had a good reputation for tuning
Description
View
Description
View
Description
View
Description
View
Description
View
There are no details of the specification or history of its use. Some of the updates to the build include the water-cooling system, a new magnesium cast front brake and a change from the upside-down front forks. It still appears to have a 6 speed gearbox. There are changes to the frame design and the swing arm is now in box tube.
Jeep:  If anyone has details I would welcome them and would include them in the page. If the photographer would care to contact me and allow me to continue to use them I will happily add his name as the owner of the copyright.
Tatran 125cc Czech Republic -a -New Racing Machine
Description
Bedrich Fenrich on the Tatran 125cc GP Twin model
$SIGNUP$
$VALIDATION$
Working... Please wait