Jawa 250 ISDT engine with Slide Valve Industion System, 1981


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Jiri "George" Schubert's Jawa typ 554

I want you to look at my 1960 model JAWA 350 Six Day Trial (typ 554). As you know this type of JAWA was most successful model and was dominating the the world competition in sixties! In the year of 1962 JAWA Factory gave several Jawas to Austrian team just for the duration of World competition. After the competition all Jawas came back from Austrian team a where sold to the public in Czechoslovakia. I had JAWA 250 with the No. 316 that belong to an Austrian rider. But recently I wished to have this bike again. So, after a year of searching I find this Jawa 350 that was in world competition in 1960 for team DUKLA ( Czech military team ). And after total restoration I brought it into the USA! So, look at some pictures, please. This JAWA is "single hop" the same firing pint on both cylinders. Unbelievable power! And the first week in December I will get my beloved 1961 model JAWA 250 Six Day Trial. Kind regards, George Schubert

George, thank you very much for these great pictures!

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Above is the latest creation of Jiri Starec of Strakonice, Czech Republic. This CZ typ 969 built from scratch by Jiri will be used in European vintage moto-cross competition. Thanks for these pics Jiri!

Bohumil Poslední's Jawa typ 684-1-89

Hi Reese, I'm sending to you some pictures of my works JAWA from 1989. I can say these pictures are correct. There is only one small fault, I was using a different pipe. The rear fender you can see on the pictures was used only on my bike. The rest of works JAWA bikes had the same rear fender as on the model 1986-8. I hope this information helps you a bit. With many greetings from Prague, Bohumil


Magnesium Cases
6-Speed Transmission
Front Fork, WP 300 mm
Rear Shock, WP 300 mm
Disk Brakes - Front 235 mm, Rear 218 mm
Reed Valve Induction
Carburetor, Flat Slide Keihin

Water Cooling
Bore x Stroke 82 x 64, 338cc
Power Valve Exhaust
34.5 kw / 7500 rpm, (46.3 hp)
Ignition, Nippondenso Electronic
Weight 113.5 kg (249.7 lbs)
Top Speed, ISDE Gearing, 150 kph (93 mph)

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Many thanks to Bohumil for these great shots of one of the last Jawa
Works ISDE motorcycles!

The pictures at right show Bohumil at the 1989 ISDE in Germany where
he served as Czechoslovak Trophy Team Captain. These shots are from
Czechoslovak Motor Review 2/1990 & 3/1990.

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From Ian Bridge in the UK comes these shots he took at a Dutch Jawa rally a while back. A very nice Jawa speedway engine based motocrosser that shows some wonderful detail work. Also a Jawa Jr. class Banana Frame road racer that looks just like Thomas Héman's bike below. I bet this is the same bike, Thomas what say you? Thanks for these shots Ian!

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Thomas Héman's Jawa typ???

Dear Reese, I’ve had a look at your website. I’ve never seen such a good website on Czech bikes, my compliments! I have a Jawa Banana Frame 350 cc road racer of which I attach a picture. The bike is totally original and unspoiled.

Thomas: This is a great example of the Jawa Junior Class limited production road racer. I never knew they came in 350cc version. Thanks for these shots!

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Jukka Penttila's Jawa 682

Hello: My name is Jukka Penttila from Hyvinkaa Finland. Here are some pictures of a Jawa I have. It is a Jawa Type 682-0, 362cc Frame No. 274. Regards, Jukka

Thanks for the pictures Jukka!

Xavier Ponchant's CZ typ 513

Félicitations pour votre site , je viens de terminer la retauration d'une cz 250 type 513 , numéro du moteur 5130018772 , numéro du cadre 5130015119 par contre je ne connais pas l'année exacte ,si vous pouviez m'aider ... j'habite dans le nord de la france. ci joint une photo de ma cz 250 type 513
si vous pouviez mettre la photo sur votre je vous en serai reconnaissant..


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Clay Setzer's CZ typ 980.5 & 981.8

I was browsing your web site and was wondering if you were interested in photos of a 1976 CZ 250 and 400. Both bikes are original and have never been started. The person I got the bikes from was a dealer and the bikes arrived at his shop with the shocks laid down. I have the original "pinks" and the tool kit for the 400. Both bikes have the Preston Petty Mudders front and rear.

Clay, thanks for the shots. I think it's time to start those suckers! BTW Clay, they were started. At the factory before they were crated up!

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Johannes' Jawa typ 557 (1957 to 1962 250 Moto-cross)

Hello.  This is my Jawa-557. This is Ling Yes restore yourself,this is my Hobby. I have ten Machines. Thanks, Johannes

Johannes: Thanks for the picture. It looks like you ride this bike on the streets?

Jim Eyerman's Desert Special Special

I worked at a CZ shop in the mid 70's and we modified the crate CZ into laid down models. We then recrated them and shipped them back to JAWA. The shop was located in Oceanside California. I still have my 1974 which we laid down the shock on in the same manner that was done for the production models. We worked for
several months modifying red frames and then we took the enduro (black frame) and did similar modifications, also adding a coffin tank and electronic ignition to make, if I remember correctly, a bike they called the Desert Special. I had lots of fun working with Peter Sosna and his wife Tonya back when I was in my early 20's. I have attached photos of my bikes that was built while working with Peter. I hope to restore it in the nest few years after I finish a couple of projects that I have going right now. I hope you enjoy my pictures and have a nice day. Cheers, Jim Eyerman.

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Thanks for the pic and history Jim!

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Joerg Rohde's Jawa typ 652

My name is Joerg Rohde from Germany. I am coming from Enduro sports were I was riding for about 15 years in different international races for Germany and the Netherlands. Beside, I started to collect the bikes of my dreams when I began; in the early 80´s. So, now I have 2 MZ gt´s and a Jawa 250 ISDT model 652 (see attached pictures) as I recognized in your page.

Thanks for the pictures Joerg!

Alan Darlison's Jawa typ 654

Thanks to Alan for sending these pics of his just completed 1974 typ 654 Jawa ISDT machine, one of just a few ISDT Jawas in Australia

Hi Reese, I've finally finished the restoration of my 1974 Jawa 654 and have enclosed a couple pics. I want to thank you again for your assistance, for without which I'd still be struggling. It had been a while since I had dirtied my hands working on motorcycles and I must admit I enjoyed the experience.

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Mirek Toušek's CZ typ 981-2-80

Thanks to Mirek for sending these shots of his 1980 Works 412cc CZ. This was CZs last hurrah in the 500cc class. The bike looks to have KTM hubs fitted in place of the original CZ magnesuim hubs.

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CZ typ 519 Prototype Engine

Thanks to Martin Molcar for these pictures of this early prototype CZ typ 519, 125cc motocross engine. Circa 1983 thie engine featured a rotary valve intake behind the cylinder. The engine is also equipped with a prototype carburetor JIKOV 2936 SEB with a type of diaphragm controlled fuel delivery system, (no float). The designer of this engine was Oldrich Kreuz.

Lars Gerestad's Jawa typ 244

Thanks to Lars Gerestad from Linköping Sweden for sending this note and picture.

Sending you a picture of my Swedish army Jawa. Swedish army number "255", it`s a single cylinder 250 battery ignition 1959 model. Whas used in the army for almost 40 years, from 1959 to ca 2000. When the Husqvarna automatic came, it whas then transformed to the home defense and army training school. This Jawa and the magnetic ignition modell "257" from 1962, did a very good job. These bikes have an exellent roadholding and is very well known in Sweden. I have been an army motorcycle instructor and love and know these bikes very well.

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Bram Hartman’s 1952 Jawa 350 ISDT

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A beautiful example of an early
50's Jawa ISDT 350 Twin

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Bram needs an air bottle for this side,
can anyone help?

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Spare cables and levers are handy

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Jawa used aluminum cylinders
with steel liners on the ISDT's

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The starting point Perak frame

I recently received some pictures of a beautiful example of an early 1950's Jawa 350 ISDT Pérak. The bike was built by Bram Hartman in The Netherlands and accurately represents what Czech ISDT riders were using in the late 1940’s and early 1950’s. Below is what Bram writes about his project. Thank you for these great pictures Bram!

As far as I know the Jawa 350 Twin ISDT, model Pérak or Springer, was used in the Six Days Trial in 1951-1953 by the Czech team and in 1954 and 1955 by several private riders and the Hungarians. As usual in these years the competition motorcycle was almost the same as the standard production ones, except the following parts:

  • Cylinders made of aluminum for better cooling, with bigger intake and exhaust ports and bigger transfer ports. The pressed in cylinder liners use Niresist steel.
  • Reworked pistons to match the bigger ports.
  • Stone protection on headlamp and below the engine.
  • Spares for all control cables and levers, (brake and clutch).
  • A small seat on rear mudguard to protect rider to be hurt by the rear mudguard.
  • 26mm carburetor instead of 24 mm.
  • 15 teeth engine sprocket for secondary chain instead of 16 teeth.
  • Shortened mudguards.
  • Trial tires instead of block profile, same sizes as a standard.
  • Bottle with compressed air, (missing on my Jawa, I am still looking
    for one).
  • High mounted exhaust pipes with standard fishtail silencers.
  • Spare condenser and spare spark plug wire with cap.
  • Power about 15 HP instead of 12.
  • Reduced size of wheel nuts to remove a wheel with help of the sparkplug tool.
  • Lead seals between cylinders and cylinder head, to be placed during examination before the race.

Riding off-road with this Jawa will result in an enormous respect for the riders in the 50's. In old films you can see the very high speed races over terrible circuits and that during six days!!

Riding this machine you can feel very well the very short rear suspension without any damping, and also the short front suspension, (with some damping).

The seat is comfortable, but riding over stones and through holes will cause directly a hard landing on the rear mudguard. The small seat there will keep you out of the hospital.

The engine is fine, especially at low revolutions. And the noise then is like a turbine, mainly caused by the marginal metal air filter.

Under wet circumstances the small sized tires, (3.00x19 and 3.25x19), are terrible and soon your motorcycle will be buried to the axles in the mud.

But riding like this is really fun as long as it is not a real race. Riders in the 50's were heroes!

During a lot of years the Dutch ISDT-team was equipped with Jawa (250 single) and the Czech team with 250 single and 350 twin. And also several East -European teams and riders used these Jawa's.

It is almost impossible to find a complete ISDT machine, because after doing there job most of them were used in all kind of crosses until they were thrown away as scrap. I was lucky to find an engine which could be restored with a lot of work and patience. But the cylinder liners are bored out now to the last-possible oversize. As described above other parts could be used from standard machines or could be remade with photo's as example.

Although I renewed the contact points, condenser and spark plug wires, the whole is still on 6 Volts accumulator ignition and lights. Everything conforms to the original ignition of the 50's. The Jawa is a very good starter in cold and hot condition, and also during a long trip with + 35 degree Celsius in the environment the engine runs very well without any sign of cooling problems.

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The un-restored ignition

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Returned to new with spare condenser

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The Cases, in need of much work

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Nicely restored with fin repair

Kevin Blackburn's CZ Typ 968 (250 Twinpipe)

(by Kevin Blackburn)

After a couple years racing in AHRMA sportsman classes I realized that I really wanted to build a classic 250 bike to ride. Not only did I want to get in on the Premier & Classic weekends but the class looked like a bit of fun to race. I had CZ 380 which I really liked and after considering a few other bikes I decided to find and build me a CZ 250 Twinpipe. I knew that these are neither easy to find nor an inexpensive project (I had no idea I found out later) but was really taken with the mystique and cool factor surrounding these fine bikes.

After looking around for awhile I decided to pick up a running builder bike from NW CZ/Maico. A few phone calls sealed the deal and R. Borg brought the bike out to the Premier/classic event at Chehalis in September of 2003.

As it turned out after tearing into it for refurbishing the engine was a complete mess and well beyond my meager machinist and mechanics skill.

The engine was sent to CZ guru Bertus to see if he could help. Among the unusable parts were strangely remachined cases, a strange clutch basket that was welded on the crank end, a "creatively" remachined flywheel along with the usual worn parts such as shift shaft, gears and countershaft. Luckily Bertus was able to locate and rebuild the parts needed, (thanks Bertus), and I received the engine back from him in February of 2005.

Meanwhile I started on the rest of the bike. My idea was to make a racer out of it and not a show bike. New suspension was needed via Progressive (since have gone to Ohlins) and new fork springs and valving. An aftermarket fiberglass tank is used. Excels with SS spokes were installed on redone hubs. Electronic ignition and a 32MM Mikuni was added along with plastic fenders and airbox. I use a tall firm GP style seat to keep from that vintage “knees in my chest" feeling.

Finally I was able to put my classic 250 racer together. The Madras Oregon event in the spring of 2005 was its first event and except for a few minor hitches the bike has turned out to be exactly what others have raved about. It is light and nimble, fast, fun and handles like a dream.

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CZ typ 514 4-Stroke Conversion

(Thanks to Jindrich Hruska for translating and retelling this story from a Czech magazine article)

This motorcycle’s engine was built, (with help from his friends), by Jiri Boubal of Jinocany Czech Republic, near Prague. He owns several CZ scramblers of different production years and displacements, but all older than 1972. (1972 is the newest vintage bike with which you can compete in vintage moto-cross in the Czech Rep.). Jiri still rides them and he wanted to have a bike in terms of his needs. So he decided to build a four stroke CZ motocrosser out of a CZ typ 514, (the 1983-92 400 Motocross model).

The engine block of CZ typ514 is very compact, so it made first problems, because if he wanted to have nice engine, all distribution mechanisms must be inside original engine block. So the original ignition was removed and in its place is a gear reduction for the chain driven cam shafts was mounted. original ignition and instead of it here is tooth gear which two times slows down revolutions of crank-shaft and drives through chain distribution mechanisms in head. The oil pump uses principle from Husqvarna 4-stroke scrambler of the mid 1980’s. In lowest place of crankcase (where streams all oil) is a valve, that in inner death centre (when is lower compression) opens and oil is pushed through small oil cooler to the head. There lubricate distribution mechanisms and streams along chain of distribution down back to crankcase, (the engine has also oil filter, but they don’t write where exact). Engine and transmission have one oil load, which is only about 1L(0,264 US gal). Cylinder and head (four ventils) are from speedway JAWA (now are in Czech Republic two Jawa companies. First produce road bikes and isn’t in good condition, second is prospering company Jawa Divisov, which produce speedway bikes and now also some prototypes of scrambler engines - before socialization ESO scramblers and speedway bikes). These parts were chosen, because their original displacement is 500ccm and are small, compact. But their problem is cooling, so were made bigger cooling ribs. CZ514 has lower upstroke, so now is displacement 400ccm. Crankshaft must been balanced for new lighter piston, piston rod is original from CZ, but have instead of needle bearing bronze bearing. Needle bearings don´t like higher forces of four stroke engine. As I said, original ignition was removed, so now is here only contact breaker and battery, which isn´t charged (there is no alternator), but for motocross races it is enough. Ignition but has still one disadvantage, because it hasn´t regulation of pre-ignition (permanently 7,5mm ...5/17in), must builder this engine start with pushing the bike on 4th gear. Once he tried to kick it and 3 weeks had leg in gypsum :-) Carburetor is Dell´Orto PHF36 from scrambler Husquarna TE410. He tried many types, from Jikov to Mikuni, but only this fit to this engine. With it has the best power in all revolutions. At the end he writes, that reliability of CZ parts - crankshaft, clutch, transmission is very good, but distribution mechanisms from speedway bike make some problems (actually they are built not for long races, so it is acceptable). Whole engine is only about 2kg ...4,4lb heavier than original two stroke and power is about 40HP.

1978 CZ 250 Grass Track

From Matthew Keen comes these great pictures of a 78 CZ Grass Tracker. This bike looks to be powered by a 250 Falta motor and even the pipe appears to be a stock Falta pipe twisted on the header pipe so that it runs out the right side.

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The 1964 DOT - CZ Scrambler

From my Canadian vintage racing buddies Ken Burningham and Tommy Mcfarland come these shots of a DOT/CZ Replica shown by Peter Remington in the DOT display at the 2005 Stafford Classic Bike Show & Swap Meet. This is a replica of the only 3 DOT-CZ Scramblers built. Ken tells me that John Banks raced one of the DOT-CZs in 1964. I wonder how DOT got (3) 250 Twinpipe engines back then, do you suppose they purchased complete bikes just to get the engines? If there are any DOT experts out there I would love to get some more info on those bikes.

Thanks again to Ken and Tommy for getting these shots at the Stafford show.

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Olavi Peltonen's 1961 CZ 125 "Six Days"

"Hello! My name is Jukka Peltonen, from Porvoo Finland. I'm contacting you, because this bike should be quite rare. I have sent you pictures of my father Olavi`s restored 1961 CZ 125 "Six Days". I HOPE you never seen this kind of bike before... :) Take a look specially on the airbox (aluminium), gear shifer by hand too, (useful in enduro use), chain lublicator and to the twin spark system, (the other spark plug was replaced with a hand operated compression valve by my father). This CZ125 has very unique noise , because of the straight cut primary gears between the crankshaft and the clutch. This CZ 125 was my fathers dream since 1960... he has had all kinds of bikes, MZ, Bultaco, Husqvarna, Jawa Sixdays 250 and many others, but this project was his dream come true :)"

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Olavi and his 61 CZ 125 "Six Days"

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Frame looks like my Twinpipe MXer's

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Air bottle, chain oiler, and hand shift knob

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All wired up and ready for the 6-Days

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The grandfather of the CZ Moto-cross

Jukka: Thank you for the pictures! That is a beautiful motorcycle and one of the finest example I have seen of a CZ "Six Days". Your father should be very proud of that motorcycle. The CZ 125, 150, & 175 "Six Days" models were never imported to North America and I know of no complete examples of these motorcycles over here. I would like to have one of these bikes some day, preferably a 175cc. It was these CZ "Six Days" bikes that the CZ moto-cross bikes were developed from. You can see many similarities between your father's CZ and the Twinpipe moto-cross bikes of the mid 1960's.