In 2 stroke around the world

Discussion in '2 smokers' started by miguelR, Sep 16, 2013.

  1. miguelR

    miguelR biker

    Joined:
    Dec 18, 2008
    Oddometer:
    75
    Location:
    Montevideo-Uruguay-South America
    I have a 640 (638 engine) with 154,000 km and never had overheating problems

    [​IMG]
    #21
  2. miguelR

    miguelR biker

    Joined:
    Dec 18, 2008
    Oddometer:
    75
    Location:
    Montevideo-Uruguay-South America
    continuation:

    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    #22
  3. enfielddnepr

    enfielddnepr Been here awhile

    Joined:
    Feb 4, 2011
    Oddometer:
    171
    Location:
    Assen, Netherlands
    The 640 has also alu barrel casing, but this 634 has cast iron cylinders.. that's why my question but eh, with 35 celcius in a traffic jam, my 638 GOT some overheating issues..
    #23
  4. miguelR

    miguelR biker

    Joined:
    Dec 18, 2008
    Oddometer:
    75
    Location:
    Montevideo-Uruguay-South America
    Texas y Baja California (México)



    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    #24
  5. hzoltaan

    hzoltaan Adventurer

    Joined:
    Jan 21, 2011
    Oddometer:
    83
    Location:
    Krakow
    I had 634 and 638 engine and now I ride a 632 powered jawa Ts. (TS frame with CZ472 engine (which is Jawa 632, nothing else)
    The 634 and 632 are basically the same, the 632 having 12V alternator.
    I belong among those who say the earlier engines (meaing 634-632) were better.
    the latter has alu cilinders, and better bearings but also the tipically worse material and machining quality of the late socialist industry. :( I saw 1-2mm differences between the steel cylinder sleeve and the alu casting. Carb mounting bolt thread was drilled into the intake channel. Gearbox shifting mechanism was far weaker (the cast iron shifting fork was replaced with a thinner metal sheet fork, and was prone to bending and breaking. :( Fixing stuck gearbox is only possible by splitting the engine. After 2-3 gearbox failures, and home-garage forced splittings, the engine is never good again. There is a proper way to do it, but most owners or mechanics did not bother with that. :( So the 638 is not considered to be a very reliable bike. I put 19000km on my 634, had continous trouble with ignition (setting the point in every 600km) but that was a 10 min job, and mostly due to the bad quality aftermarket points. I had to replace the clutch side crank seal once, that was all. That took me an afternoon. Apart from that, countless hours or oiling, bowden failures, clutch setting. :D But never had problem with gearbox, carb or electrics. after 33000 on the clock, the engine needs big end bearings fixed up, so it's in a box.

    The now used 632 is awesome. already 12V so I have a VAPE system on it, and it goes goes goes.

    Eh... sorry for the lenghty story. :p
    #25
  6. enfielddnepr

    enfielddnepr Been here awhile

    Joined:
    Feb 4, 2011
    Oddometer:
    171
    Location:
    Assen, Netherlands
    Well, i overhauled my 638 engine and it has now 38.000 trouble free km's on it. I've been told the 638 were made in very poor quality for the 'home'market and better for the export market. Though also over here the 634 engien is said to be manufacured with more care, but has iron cylinders which would make me afraid for piston jams in hot wheather and f.i. mountains or traffic jam.
    also a big difference is that the 638 engine has 2 bearings in the middle of the crankshaft, which are prone to go first, but the crankhaft hbs are of VERY soft material.. maybe hence the choice for a double bearing..
    As for my 190cm, the 638 is a little higher and better seat..
    #26
  7. miguelR

    miguelR biker

    Joined:
    Dec 18, 2008
    Oddometer:
    75
    Location:
    Montevideo-Uruguay-South America
    Mexico
    Playa de Santispac:

    [​IMG]
    [​IMG]
    #27
  8. miguelR

    miguelR biker

    Joined:
    Dec 18, 2008
    Oddometer:
    75
    Location:
    Montevideo-Uruguay-South America
    continuation:
    Guatemala
    [​IMG]

    Honduras
    [​IMG]
    #28
  9. England-Kev

    England-Kev Long timer

    Joined:
    Feb 5, 2007
    Oddometer:
    3,771
    Location:
    England. Somewhere on the Canal.
    This is great, another adventure to prove you don't need the latest greatest big bike to have fun. And travel the world

    :clap:clap:clap
    #29
  10. _cy_

    _cy_ Long timer

    Joined:
    Sep 25, 2011
    Oddometer:
    6,465
    Location:
    Tulsa, Oklahoma
    amazing .. what kind of mileage are you getting?
    #30
  11. bchunter

    bchunter Been here awhile

    Joined:
    Apr 17, 2010
    Oddometer:
    118
    Location:
    Smithers, BC
    One of the main reasons that I ride a street legal two stroke :ksteve

    Way to go miguelR. Thanks for representing the 2T!! :beer
    #31
  12. Foot dragger

    Foot dragger singletracker

    Joined:
    Dec 27, 2006
    Oddometer:
    12,963
    Location:
    chico,just below rag dump(nor-cal)
    Nicely done! Good to see the two stroke out going round the world.
    #32
  13. PhiSig1071

    PhiSig1071 What's ******width?

    Joined:
    Apr 9, 2008
    Oddometer:
    2,573
    Location:
    Tucson, AZ
    Amazing!

    Wish I had known you were coming thru Arizona, I would have loved to meet you.
    #33
  14. miguelR

    miguelR biker

    Joined:
    Dec 18, 2008
    Oddometer:
    75
    Location:
    Montevideo-Uruguay-South America
    More pics.
    Costa Rica:
    [​IMG]
    [​IMG]
    [​IMG]

    Panama:
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    #34
  15. miguelR

    miguelR biker

    Joined:
    Dec 18, 2008
    Oddometer:
    75
    Location:
    Montevideo-Uruguay-South America
    Panama to Colombia:

    [​IMG]
    [​IMG]
    [​IMG]

    Colombia:

    [​IMG]
    #35
  16. miguelR

    miguelR biker

    Joined:
    Dec 18, 2008
    Oddometer:
    75
    Location:
    Montevideo-Uruguay-South America
    More, more, more............
    Colombia:


    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]


    Ecuador:


    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]


    (Amazonia):


    [​IMG]
    [​IMG]
    [​IMG]
    #36
  17. vtwin

    vtwin Air cooled runnin' mon

    Joined:
    Jan 11, 2005
    Oddometer:
    7,755
    Location:
    NorCal
    Fantastic photos! Thanks for the update.
    #37
  18. miguelR

    miguelR biker

    Joined:
    Dec 18, 2008
    Oddometer:
    75
    Location:
    Montevideo-Uruguay-South America
    Continúa...

    Peru


    [​IMG]


    Bolivia


    [​IMG]
    [​IMG]
    (Uyuni):
    [​IMG]
    [​IMG]
    [​IMG]


    Argentina


    (Valle de la Luna)
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]


    Dakar 2014:
    [​IMG]
    #38
  19. enfielddnepr

    enfielddnepr Been here awhile

    Joined:
    Feb 4, 2011
    Oddometer:
    171
    Location:
    Assen, Netherlands
    I love the pics!!
    did you make adjustment/improvements to the engine or is it original?
    #39
  20. miguelR

    miguelR biker

    Joined:
    Dec 18, 2008
    Oddometer:
    75
    Location:
    Montevideo-Uruguay-South America
    Acá explica las modificaciones de la motocicleta.
    http://www.jawakolemsveta.cz/asijske-rusko


    [​IMG]
    Nejbohatší zkušenosti s Jawou mám ze sedla 350/640, se kterou jsem procestoval celou západní Evropu i kus Afriky. Byl to tehdy nejmodernější „twin“ z Týnce a na okrese jsem byl s její modrou metalízou Frou Frou, kdežto v cizině za podivína, co při každém tankování rituálně kvedlá motorkou u stojanu a občas se rejpe v mechanickém zapalování. Než jsem jí po více než 40 000 km prodal, svezl jsem se na starší 350/632. Možná tam se tehdy zrodil můj vztah k motoru 634, který považuju za nejpovedenější třistapadesátku Jawy – jednoduchá, spolehlivá a hlavně klidná. A navíc, tohohle modelu je plné Rusko, kde mívaly Jawy příchuť tuzexového zboží. Jenže kupte „čtyřku“ nenapadenou kutilem! Budete mít co dělat. Tahle autoškolácká chuděra má dodnes odřenej lak a chrom nádrže od druhých řídítek, její motor nikdy nezažil pořádnou dálniční vypalovačku, takže byl plnej černýho mazutu, gumy na placáka, spojka po smrti, ložiska řízení zamčená v poloze Vpřed!... Vzhledem k tomu, že motor je typ 633 (ex Bizon) a nesedí ani číslo typu v techničáku, nebyl to asi rozumnej kup. Ale co je vůbec rozumnýho v projektu JAWA KOLEM SVĚTA?! Střih. Estetiku jsme příliš neřešili, motorka stejně dostane za uši, tak proč dávat třeba sedmičku za nové chromované laufy, které pak následně budu tahat kamením a blátem? Motor šel na ponk a zbytek motorky se atomizoval do krabic. Kromě čištění a lakování rámu jsou na šasi nová ložiska řízení a lehce zrepasovaná vidlice, u které kovové krycí trubky nahradily gumové harmoniky. Rám je v zadní části vyztužen kvůli schopnosti unést náklad kufrů. V přední části jsou namísto klasických padacích rámů nosiče dvou bočních schránek.
    Motor prodělal celkovou GO, při které zůstala nedotčená jen holá převodovka. Původní ojnice s pístními čepy na jehlách jsou přestavěny na bronzová futra, a to především s ohledem na případnou „polní demontន. Drobnými úpravami je mírně navýšen výkon na standard tehdejších strojů exportovaných do SSSR, kde se nemusely tak striktně dodržovat hlukové předpisy. Odvzdušnění převodovky je vyvedeno do airboxu kvůli brodivosti. Ze stejného důvodu jsou použity vodotěsné koncovky zapalovacích kabelů. Nejzásadnější změnou je náhrada původního dynama 6V/75W generátorem VAPE 12V/150W s bezdotykovým zapalováním. Výrobcem veškerých nosičů a schránek je firma GRAVE. Zadní boční kufry mají objem cca 47 l každý. Přední schránky jsou schopné pojmout 2x 3 dvoulitrové PETky, čímž zásoba benzínu stoupne na celkových 25 l a dojezd na více než 500 km. Tam, kde je dostatečně hustá síť benzínek, jdou PETky do koše a ve schránkách o objemu 2x 10 l je možné vézt cokoliv jiného. Je to mnohem praktičtější systém, nežli jednoúčelové kanystry, které polovinu cesty vezete úplně zbytečně.

    Google Translator:
    The richest experience JAWA got out of the saddle 350/640 , to which I have traveled throughout western Europe and a piece of Africa. It was then the most modern "twin " of the district Týnce and I was with her ​​metallic blue Frou Frou , while abroad for nerds , what with every fill ritually kvedlá bike in the rack and sometimes butt in a mechanical ignition . Before I after more than 40,000 kilometers sold , I drove the older 350/632 . Maybe there used to be born , my relationship to the motor 634, which I consider most successful třistapadesátku Jawas - simple, reliable and most importantly quiet . And , of this model is fully Russia , where they used to flavor Jawas tuzexového goods. But buy ' Four' uncontested handyman ! You will have to do . This autoškolácká poor thing still has odřenej paint and chrome tank from others handlebars , the motor never experienced a proper highway burner, so he was full of the black black oil, rubber to Placák , after the death of the clutch , bearings, steering locked in the forward position ! ... Given that the engine is type 633 ( ex Bizon ) and does not fit in the type or number techničáku , it was probably a reasonable buy . But what is not rozumnýho project JAWA AROUND THE WORLD ? ! Cut . We did not address the aesthetics too , the bike gets behind the ears as well , so why must give seven for new chrome Lauf , which in turn I will pull rocks and mud ? Motor went to the workbench and the rest of the bike is atomized into boxes. In addition to cleaning and painting the frame on the chassis of the new steering bearings and easily reconditioned fork, cover with a metal pipe that replaced the rubber accordion. The frame is reinforced in the rear because of the ability to bear the load of luggage . In front of the frame instead of the classic pitfall support two side boxes.

    The engine has undergone a total overhaul, during which remained untouched by the bare gearbox . The original connecting rod with piston pins and needles are converted to bronze futra , especially with regard to any " dirt removal ." Minor modifications is slightly increased performance on standard machines exported to the then Soviet Union , where he did not have to strictly comply with noise regulations. Bleeding gear is brought into the airbox because of Fording . For the same reason they are used watertight fittings ignition cables . The most significant change is the replacement of the original dynamo generator 6V/75W VAPE 12V/150W with contactless ignition . The manufacturer of all carriers and boxes , the company GRAVE . Rear side bags have a volume of about 47 l each . Front boxes are capable of carrying 2x 3 -liter five, so gasoline stocks rise on la range of 25 to more than 500 km . Where is sufficiently dense network of gas stations , Petko go to the basket and in boxes with a capacity of 2 x 10 l can ride anything else. It's much more convenient system than single-purpose canisters halfway carrying nothing.
    #40