Hello and welcome to all english speaking Jawa 500 OHC Fans and owners around the world!
I opened this special section in our Forum to communicate with the many international Jawa 500 OHC owners, but feel free to write in every section of the Forum in english too. I hope we all can share our information about our bikes to keep them on the road (and @ Greg: on the racetracks)!
The Forum lives from text and pictures, so please tell us something about you and your bikes and show us some pictures!
When I find some time, i´ll change the complete Forums heads and themes to a bilingual version.
Hey guys. Nice to get some reactions out of other contrys. It will be nice if you can attach some pictures from your bikes and some informations about frame and engine numbers. We collect all the information in a list, try to follow the production numbers and try to compare it with the manufacturing date. I never seen before a 500 OHC with australien license plate. Go ahead and send us some stuff. Thanks and best regards from all germann Jawa drivers Franko
Hi Axel. Very nice to have an English Section, thank you.I have been looking for one of these bikes for a number of years, and finally found one recently.Fully restored 1958 /02, serial number 15005184 -- must be a very late one.Have not been out on it yet, just waiting for a good day. Cheers from Vancouver Canada, Dale.
Got a JAWA 500 OHC taking up space in my workshop I was going to share it with you all but cant get it to paste on this page But like the JAWA ia am working on it . well I got the pictures over here the bloke Victor that started this build from that woodern mock up over 30 years beforehand . I am now finishing the work he started so long ago to make it a rideable show bike he would be proud of . thanks to Greg Sommerton & others along the way for info & help as not many of these made it down under to Australia . Ignorance has killed many before the NET arrived & we could find a cure for that .
Well I am still waiting for throttel slides to come from the UK meanwhile I have made a ainti drain back valve that is holding back 5 Lt of engine oil at the moment as the oil pump was passing oil straight through the gear pump in a month 5 Lt would make its way to the crankcase . I am making a racing stand that will hold the rear wheel clear of the floor so when I finaly start the beast up I will be able to run the transmition & load the engine with the back brake to bed the rings & get some heat into things & tune the engine before I goes to my friends Dyno for load break in cycles & see what needs more work . New carburetor float assemblies have been fasioned manifold shortened to gain acces to the carbys for jeting & tuneing that was not posible the way it was set up by its maker looking forward to making a noise soon as the parts arrive 3 months have passed but I am asured that this week they will be posted ??? TC
OK time has marched on & the job is still on going I have since machined & fitted seals to the magneto & its engine mounting hardware after I found it to be faulty so it got converted to just breaker points opperation & battery ignition system twin output ignition coil fires top & bottom each stroke no worries with a good spark after costing a magy rebuild it can wait . Tha tt10 throttel slide's & other AMAL bits needed after a 3 months wait it was all got to start up . filled the oil tank earlier to test my anti drain back valve & found it still leaked so the spring got tensioned a little more . I spun the engine over by hamd with the rear wheel the oil pump returned oil OK so after taking a guess at the ignition timing I set it at 38 Deg BTDC put it on the race bike starter a friend loaned me & spun it to life WOW the wife ran from the workshop holding her ears all the local dogs started barking as I tryed to get neutral was the clutch is draging a little so I stopped it 30 seconds was enough to know I had more work to do when the oil started dripping of the crankcase so I had still more work . With all the oil retained in the engine now & breathers working great carburetors ajusted leaner & ignition timing advanced still more & a mate in the shed to help me last week we fired it up yet again sounded good but still rich down low ignition timing geting close to what it needs some whare over 40 Deg i think I gave it a few good revs after no oil apeared to be leaking & it sounded awsom with thoes big straight through pipes it ran for several minutes then made a funny sound spat back & stopped with a clunk & somthing hit my leg as it flew from the engine it had spat the coupling on the camshaft top end breaking the retaining nut & its seals & damaging the cover tube a little we put it on the stand & went to the PUB . its now the 24/06/ 12 I have repaired the tube made a new tube nut & seals I found that one sleve that holde the couplings in line was a home made thing & that the shaft had been turned down a little on one end so it could be slid back & you can take the shart out & all it gear without taking the cylinder head off but I had assembeled it with this end up so after time & use it worked its way down & the shaft fell out . That wont happen again as its now the right way up & got loctite on its surfaces . OK next week it will get another start up when all my neibours are at work . I will see what other traps Victor has set me , TC
Well I am back at the 500 OHC agaim took a break to think about lube problems & oil leaks found lots of things wrong with too much oil pressure being a real problem I think i have found most of thoes the main being missing parts from the timing case & reliefe valve area all wrong . The return pumps could not clear the cases as no oil was being by passed at the reliefe valve timing case was floded to . I anm testing the new valves on the bench & will set the pressure before I retime the ignition & replace the cam timing gear& set the clearances of the bevil drive . That enough for now . TC
Here is a Jawa 1500 in March 2012 when I bought it. It had been with same owner since 1957 but was sold due to age. It was bought in 1957 from a Swedish TT driver, Nisse Jönsson in Stockholm. He intended to make it to a TT machine but came to other thoughts (luckily). The "new" owner used it now and then until 1965. The speedo shows 6000 km. After several parts orders from Motoren and helpful Jawa Freunde it became ready to run in March 2013! Pic from May 2013 before registration. The registration process is another long story.
Willkommen im Oldtimer Forum für Jawa 500 OHC Motorräder von 1952-1958!
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