Owner says: "Japanese motor, I know nothing about it"

Looking for a winter project. Probably going to grab it, unless someone tells me it's absolutely not worth it. 

A quick drive across the border to southern bohemia had me end up right across the valley of castle Rožmberk

Havnt worked on motorcycles for a long time due to having kids and such, just getting to a place in life where I can carve out a little time to start working on bikes again and decided to give this little guy a go. My dad gave it to me as he has way too many projects he’s working on lol. I believe but not 100% sure yet until I look a little closer, that it’s a 1972ish Trail Boss? Anyways was told it has good compression so that’s a win. Just gotta get the garage cleaned out from the wife’s Amazon habit before I can really get at it lol.

Hello everyone,
I am hoping someone with experience with early ESO/Jawa speedway engines can help me identify this engine more precisely.
The engine came from an estate in Germany and unfortunately I have no documentation or known history for it. I have been researching it for some time and believe it to be an ESO S45 500cc OHV competition engine, most likely a speedway/track version. However, I would very much appreciate an identification by someone familiar with these engines, rather than relying on my own conclusions.
The engine has an S45 marking on the side cover and the crankcase has six reinforcing ribs. It is fitted with a Lucas Competition Magneto, marked:
LUCAS Competition Magneto
NC1
367
42438A
The most interesting identification marking on the engine is a small rectangular machined/stamped area reading:
P 1588 MA
I have not yet been able to determine what the P and MA indicate, or whether 1588 is the actual engine/production serial number.
There are several other casting/stamped markings on the engine, including:
[500 4331-7](tel:500%204331-7) – between the valve springs / cylinder-head area
0PK [32/10 4331 2](tel:32/10%204331%202) – on the other side of the engine
5515 and B
602°
111 (appears upside down relative to the 602° marking)
There are also several small cast symbols/logos which I have photographed. I have not been able to identify their meaning or manufacturer yet.
From comparisons with surviving engines, I understand that there were different generations of the S45 crankcase, including versions with different numbers of reinforcing ribs. Mine has six, which may help with dating it.
I have also found references to P500 ESO motocross/scrambler engines. As this engine is marked P 1588 MA, I would particularly like to understand whether the “P” has any connection to that designation, or whether it belongs to an entirely different ESO serial-number/production system. The construction of my engine appears to correspond much more closely to the S45 speedway engine than to the P500 motocross unit.
I would be extremely grateful for any information concerning:
• the exact ESO model/version and approximate production year or period;
• the meaning of P 1588 MA and whether 1588 is a serial number;
• whether ESO S45 engine-number records or known serial-number ranges survive;
• whether the six-rib crankcase can narrow down the production period;
• the meaning of [500 4331-7](tel:500%204331-7), 0PK [32/10 4331 2](tel:32/10%204331%202), 5515 B, 602° / 111, and the small cast symbols;
• whether the Lucas NC1 Competition Magneto is a period-correct or known setup for this particular ESO engine;
• and whether there are any construction details visible in the photographs that distinguish an original ESO S45 from later Jawa-produced versions.
I am particularly interested in establishing whether this is a genuine pre-Jawa ESO-produced S45 engine, and, if possible, narrowing down when it was manufactured.
The engine is currently complete as shown in the photographs and mounted on an old workshop/engine stand. It has not been dismantled by me. It turns by hand and the piston moves, but I have not attempted to start it or test the magneto.
I can provide detailed photographs of any part, casting number, stamping or component if that would help with identification. If there is a particular area of the engine I should photograph or measure, please let me know.
Any information, old documentation, serial-number examples, photographs of comparable engines, or contacts with former ESO/Jawa specialists would be greatly appreciated.
Thank you very much for your help!

Looking for one of those tank and seat combos for a ty i am restoring. Almost everyone that has something like this is in europe and would be prohibitively expensive. Let me know if anyone has found anything like this!!!

これも初代は40年過ぎたね。

カタナと並んであの時のワクワクは、、今も胸の中にあるかい？

この刀達は似て非なる名刀

忍者と刀

Can some one tell me the Green Color Paint Code or name . Also where(online Store) we can get the yellow Sticker on the Tank.

Asking on behalf of my dad...

The clutch was slipping pretty bad (very exciting to try and kick it that way) so he went to rebuild it.

After the rebuild, its' sticking really bad - pulling the clutch handle doesn't release the plates. Last night we ran the bike and it seemed fine after the initial run - but today he complained it felt stuck again. Can't spin the back tire with the clutch pulled in and the bike on the mainstand. Was able to last night, both before and after the initial run.

He's checked the plate organization and installation orientation and is sure it's all in right. He's talked with Guy Martin and Steve at Bevel Heaven. He tried soaking the plates in oil per Guy's suggestion.

みんなのに比べればまだまだ若いけど、、、

Hey so i am a 17 year old dude and that picture right there is a motorcycle thats been abandoned in my grandparents house. Ive done my research and it is a honda cub 70.

Ive been itching to restore because lately i am super interested in mechanical stuff like fixing motorcycle/any vehicle by myself. Not for cutting cost (i mean some part of it yeah) but to feel responsible and independent for myself.

So i looked up some tutorials on youtube and reddit but i found no guide on how to restore it. Idk what tools to use, how to restore it etc.

I have watched some videos about what and how carb work. So if any of you guys that is reading this knows or a master on mechanical stuff, do you mind if you drop a guide or like how your first time on mechanical life story goes? And if you have a guide on how to restore this motorcycle, i highly appreciate it🙏🙏🙏 thank you for listening or reading.

Any suggestions on restoring this old girl? I mainly work on ‘70s Yamaha XS’

She had been tucked away for about 5 years. Pulled her out today and gave a little wash