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 My Jawa

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yamazuki



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PříspěvekPředmět: My Jawa    My Jawa  EmptyWed Mar 11, 2015 8:00 pm

Ok so here is a picture of my "new" Jawa. Can´t wait to get it running.

My Jawa  F216BFA6-85C5-41C9-8570-65D35A41FF1A_zpspuzj9td3
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyWed Mar 11, 2015 9:34 pm

Wow, it's in very good shape, very nice motorcycle, looks in perfect original shape.
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyWed Mar 11, 2015 9:42 pm

It shows approx 5000 km on the odometer. Not alot for an -86. Maybe I should keep it as it is just get it running and fix a couple of small faults.
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyWed Mar 11, 2015 10:03 pm

If you will have any questions, this forum is here only for you at this moment Very Happy Running should not be problem, maybe alternator will be faulty, but nothing unfixable.. Smile It's nice you want keep it as it is, I know your first plan was to build a dirt track bike. Smile
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyWed Mar 11, 2015 10:17 pm

Alternator was rewound and should be better than new. New rectifier as well. New clutch assembly.
The guy who sold it was fixing it up but got really sick and didn´t have energy to continue. I have many receipts of various parts that he bought for this bike.

I have an old Honda mtx 125 maybe I will turn that one into something like a dirt track in the future. A lot of projects and not a lot of time.
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyThu Mar 12, 2015 5:52 am

Yeah I know it. The time is against us.
I see your Jawa is realy better than new, that running problem will be piece of cake.
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyMon Mar 16, 2015 8:32 pm

Today I had time for my Jawa. My plan was to change to the new ignition plate that came with the bike. Found that something was wrong with breaker axle? (Don´t know the right word for it)
My Jawa  3FA80B4D-F18B-46FA-B432-3A68213D8C95_zpsn9oibulm
Someone had broken the bolt that holds the rotor thing in place. Managed to drill it out so no worries. Smile
My Jawa  0CF4CDEF-EB8C-43EB-B600-A66DD139D7DB_zpsiws1vgto


Put the new ignition plate in place but it´s a bitch to set ignition timing. The breaker gap should be 0,3mm right?
I can get timing perfect on the right cylinder but there isn´t enough adjustmen left to get it correct on the left cylinder. Wrong plate?
My Jawa  F4D6FD1D-1C6A-445F-A9B9-51852B58F182_zpscwlrrtwi


It ran like crap on the left side and blew out my muffler with a beautiful explosion. lol!
My Jawa  95A0FFAE-6C4B-4B0D-8607-32ECE1EA5E05_zps1tr6kbhj
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyMon Mar 16, 2015 10:53 pm

Wow...
That bearing is weird I think, smaller ring should be more inside engine. But I know only 634 engine. If rubber seal sealing properly, it should be like that. I didn't find any picture on google Sad
Gap is 0,3mm on upper position, then you must set piston 3mm back in front of upper position, and set breaker to position, where you can put between interrupter contact cigarette paper with rezistance. But I think you know it. Plate looks right, I googled some pictures and it looks same.
I have an idea. If you don't have left space for set left cylinder, maybe camshaft isn't centered. Measure, if one cylinder is exactly in upper position, other cylinder must be in exact lower position. Maybe if you have one cylinder in upper position, other cylinder is only on his way to lower position. Maybe crankshaft is twisted in flywheels... Maybe, if you wanna go to extreme, you can grind holes for adjusting screws little bit. But it don't solve problem, only work around the problem.
Aaaaa! I must learn english. Very Happy
Btw. it must be nice explosion, if it twisted that muffler.
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyMon Mar 16, 2015 10:58 pm

Btw here is video how to set, but with czech marks, but it's understandable from video. He uses different clearances 0,4mm and 2,5mm, but it will works.

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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyMon Mar 16, 2015 11:41 pm

I will have to measure pistons tomorrow. Hopefully one is down while the other is up or else this bike will have to wait until next winter.

I saw splines on the "breaker axle" is it possible to change location on it to change when breakers open without moving engine or ignition plate?
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyMon Mar 16, 2015 11:55 pm

Found this pdf on my google raid. Seems to be a complete list of timing settings for a lot of Jawa models.

http://soubory.etovar.cz/tabulka%20-%20predstih.pdf
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyTue Mar 17, 2015 9:08 am

Yes, IT is complete timing set of Jawa motorcycles.About splines, I think not, this is only rod welded on plate, if you mean that thing on witch is interruptor braker arm mounted.
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyTue Mar 17, 2015 5:32 pm

Phew the pistons was ok. One in top and one in bottom.
Took pictures today of what looks like splines. Maybe just to keep the copper rings from spinning?
It´s fun to work on my Jawa, there is alot of stuff I haven´t seen on my other bikes. Very Happy

My Jawa  BAE46E3B-EC7F-4EA6-B704-516A1EA782BE_zpsdhapawaf


My Jawa  6BB04141-B9FA-4FE2-9370-908B53C7A4B7_zpsnsxoji7t
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyTue Mar 17, 2015 7:02 pm

Wow I have never seen it before. That copper ring maybe shoud rotate and splines should transfer torque. But It's spanish village for me. :-D where do you think is problem? You wrote you don't have enough space for adjust left cylinder. I don't see anything, I don't know this ignition. I'll try google some photos. Is camshaft properly installed?
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyTue Mar 17, 2015 7:29 pm

I removed the ignition plate and flywheel. This is how it looks behind the flywheel. The copper rings are for the charging system. Isn´t this Jawa original?
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyTue Mar 17, 2015 8:36 pm

It maybe is JAWA original, but I don't know 638 engine.
But I google JAWA 638 alternator and it should look like yours.

My Jawa  SDC10808

so I think there's no problem, where is right cylinder, if is set to correct shift? I mean screws on plate, is it on any outer position? Or you can move plate more? If no, fault maybe is in camshaft position. Crankshaft on right side, where is mounted camshaft maybe can be displaced. You can solve this problem by increasing space for adjusting screws by edging.
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyTue Mar 17, 2015 8:50 pm

The right adjusting is pretty much in the middle but the left adjuster is turned anti clockwise as far as it can go but its still not enough. I think you can see it in an earlier picture.

Man I love the two stroke sound takes me back to when I was a kid and riding my Kawasaki 80cc dirtbike. Twisted Evil
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptyWed Mar 18, 2015 7:55 am

Only idea, rotor where is mounted camshaft is rotating steady? No elyptical rotating or rotating not in axle?
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptySat Mar 21, 2015 5:15 pm

Ok I had a little play in the mounting screws for the generator housing so I could turn it a tiny bit anti clockwise. This made it possible to adjust the timing for the left cylinder.

So on to the next problem. affraid

It´s not charging. Removed the grey wires and measured ac and dc but got nothing at all.
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptySat Mar 21, 2015 8:34 pm

Well, charging is common problem on JAWA. Very Happy
Do you have any wiring diagram?

My Jawa  Jawa-350-6381

Maybe one of the grey wires are alternator excitation and if you will remove it, there will be no current.Also try to measure stator:
X-Y 766 µH
Y-Z 702 µH
X-Z 809 µH (not exactly, but values should be of the same order)

and try to check embers, or carbon, or...? I don't know word for it:

My Jawa  080192.jpg?30.10
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptySun Mar 22, 2015 12:52 am

I think the rotor is bad. Tried to measure ohms between the two copper ring but got nothing.
Don`t know what value but some resistance should be there.
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptySun Mar 22, 2015 12:55 am

Maybe I should order this? Saw on some other page that you could run without battery with this kit.
http://www.jawashop.com/Detail/10616
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptySun Mar 22, 2015 6:13 am

Yeah, VAPE. The best thing you can buy. It's contact less, it's reliable, and it's not expensive. It works like magneto, you don't need battery and and it's bolt on. But I'll recomend to install battery also, it's not good for charger charging to short circuit or to nothing. I have VAPE on my JAWA too and I'm satisfied.
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptySun Mar 22, 2015 9:40 am

Sounds good. I will buy it when I saved up for it. Emptied my little play account when I had to buy my Jawa pig

My Jawa  SDC10808

Do you have any info on what resistance a good rotor should have?
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PříspěvekPředmět: Re: My Jawa    My Jawa  EmptySun Mar 22, 2015 12:04 pm

It should be around 6 ohm.
So you have bad rotor. Maybe you can buy used one, I don't know how common are these parts in your country.
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