classic motorcycle forum

Glad to have been of assistance. Like many of us I always aimed at having a flash OHV vintage sports bike but could only ever afford the everyday sidevalve models. Finally I got the message that getting a sidevalve to run nicely is just as much fun so I play with either ancient sidevalve or ancient two-stroke nowadays.

The part that really interested me on your engine is the replacement oil pump along with the sight glass and feed control screw down on the crankcase. These show a degree of workmanship I admire and I'd like to see the internals. I suspect a rotary pump in the P&M Panther style. Could you put up a photo with the the outer cover off to show the internals?

Many people don't like the Pilgrim pump it replaces as the Pilgrim is the subject of many an urban myth but personally I have no bother with them now I know them.

Cheers,

Sorry, for made u keep waiting. I've been so busy these days....that's why I could not reply you fast. I will take picture the oil pump tonight.

Thanks for your help. I hope we can keep contact....

I hate to disappoint, but the "1915 JAP" motor on cybermotorcycle is not a 1915 JAP - trust me on this one. JAP motors had fins across the head (rather than fore-and-aft as seen on your motor and the one you link to) until c1921, and most had an oil box underneath the timing chest.

Leon

Thanks for your info.

So, do you know what it is? Or you have a manual book or any kind of links that can explain about this kind of engine?

I hope you can help me further...because I still didn't have time to disassemble that engine. That's why I think before I start to disassemble it, I try to search information as much as I can about it.

Regards
Hartawan

 

thank you.

Possibly a Blackburne from the later 1920s - say 1927-ish?

A bit like this one http://www.classicmotorcycleforum.com/index.php?topic=4048.0 but larger. Have you measured the bore and stroke?

Leon

No not yet. I still dont have time to do anything with the machine.

That's why. When I'm in the office I try to seek any info as much as i can


Oh. N thanks for ur respond. I appreciated. Hopefully I can find a usefull information from ur link..

What a pretty little engine !
It does say JAP on the drive side crankcase ?

Firstly, JAP mostly used a fairly complex series of letters to identify their engines, and any special features. If you can find a (possibly long) series of letters anywhere there, it should go a long way to identifying it. If it has numbers, they will give an indication of year.

2ndly, looks 1920s, more later 20s. Someone has done a lot of work fitting quite a sophisticated looking oilpump, and presumeably oiling system. Subeam engines usually had a Sunbeam badge inset into the timing cover itself ?

That Amal sidefloat carb looks decidely later. Likely to be quite a good performer because of it...

See where we go with the numbers/letters to give a year ??
JAP supplied literally dozens of manufacturers with engines, so pinning down a precise make it was fitted to may sometimes be somewhat problematical.
Cheers.

thanks for your explanation R.

please see the attachment for the serial number, but as far as I knew about JAP engine number, the number that pun on my engine it's not like a normal JAP engine number. That's why I'm a little bit confuse about this engine. here's the engine number.

if you see the attachment...on the left side there was a number: 4090D, and after that continued with a "engine number" like this one UCS4114188. Is that explain something...

And agreed about the sunbeam, they always put their logo on the timing cover or the SUNBEAM name it self on the left crankcase

I hope I can find some pictures that I can use as reference when I start to rebuild my old bike

Best Regards

Have fun! Don't forget that gearboxes (Burman, Staub and others) come in a range of sizes to suit "motorcycles of any power" as it says in the attached Staub advert from 1924. Not sure what size your motor is, but if it's 350 or smaller it would usually go with a 2-stud-mount gearbox like the one in the advert. 500cc+ would usually have 4-stud. Sorry I don't know anything about Ravats, or dating Blackburne motors.

Leon
[/quote

Nice info. Since yesterday I tried to find any kind of information about those gearbox. But I have foundnothing. Maybe my keyword was wrong. But I really appreciated you.reply

Thanks

Few days ago, i bought this engine and found what motorcycle it was. It was ER 20 model from RAVAT motorcycle (finally...i knew it  )

But right now, I need information about the gearbox. Is there anybody here know about it?

At the first time, I thought it using the sturmey archer gearbox, but i still don't what type of gearbox that had been used for this motorcycle.

I would appreciate for any kind of information. Thanks before..