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Old 10-09-2013, 11:17 AM   #16
Badboygene
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My Jawa

I had that same model Jawa and it was a great bike. I put 40,000 miles on it with very little maintenance. It's one of those bikes I wish I still had.
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Old 10-09-2013, 03:04 PM   #17
Twin-shocker
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The old soviet bikes werent much to look at, and certainly not fast, but in terms of reliability and low running costs they still seem to have current US and UK built bikes beaten by an awful long way.
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Old 10-09-2013, 04:48 PM   #18
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Good stuff!!! I rolled out one of my RD's yesterday and rid the nieghborhood of pesky skeeters!!!
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Old 10-10-2013, 05:42 AM   #19
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Quote:
Originally Posted by Twin-shocker View Post
The old soviet bikes werent much to look at, and certainly not fast, but in terms of reliability and low running costs they still seem to have current US and UK built bikes beaten by an awful long way.
Certainly!!!!!!!!!!!!!



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Old 10-11-2013, 01:38 PM   #20
enfielddnepr
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Location: Assen, Netherlands
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I love it, i thought i was trying by travvelling 6000km's this summer through europe on my 638, also trough your country..
i like the 634 model better but the 638 has a higher and larger seat and must be more comfy.,.
Did you ever get overheating problems?
Do yu (also) think the 634 engine is better then the 638 engine, despite the double bearings of the crankshaft of the latter?
Best regards from Assen, Netherlands
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Old 10-11-2013, 03:46 PM   #21
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I have a 640 (638 engine) with 154,000 km and never had overheating problems

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Old 10-14-2013, 06:31 AM   #22
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continuation:




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Old 10-15-2013, 09:57 AM   #23
enfielddnepr
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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..
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Old 10-18-2013, 02:42 PM   #24
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Texas y Baja California (México)






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miguelR screwed with this post 10-18-2013 at 02:49 PM
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Old 10-21-2013, 02:47 AM   #25
hzoltaan
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Location: Krakow
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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. 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
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Old 10-25-2013, 07:38 AM   #26
enfielddnepr
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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..
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Old 10-25-2013, 03:54 PM   #27
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Mexico
Playa de Santispac:


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Old 11-05-2013, 07:42 AM   #28
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continuation:
Guatemala


Honduras
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Old 11-09-2013, 01:24 AM   #29
England-Kev
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This is great, another adventure to prove you don't need the latest greatest big bike to have fun. And travel the world

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Old 11-09-2013, 02:03 AM   #30
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amazing .. what kind of mileage are you getting?
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