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#354637 - 01/24/11 7:31 pm JAP V-Twin engined specials.  
Joined: Jun 2009
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trickytree Offline
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Lincolnshire, England
Has anyone come across one using anything other than a Featherbed frame? I realise that the hight of the engine and the layout of the Nortons top tubes make this particular pairing pretty much obligatory...just thinking out aloud.

Cheers, Paul.


65 A65 bobber
A10 bitza...not (re)born yet
#354648 - 01/24/11 9:26 pm Re: JAP V-Twin engined specials. [Re: trickytree]  
Joined: Apr 2006
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DM Offline
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DM  Offline
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Cornwall
How about this one.

http://www.japrestwich.com/

#354817 - 01/25/11 5:58 pm Re: JAP V-Twin engined specials. [Re: DM]  
Joined: Nov 2010
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mwebb Offline
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east midlands, england
Its a good link if you have lots of money to spend! I believe £30,000 pounds per bike is the current going rate if you want to buy one!

#354821 - 01/25/11 6:21 pm Re: JAP V-Twin engined specials. [Re: trickytree]  
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trickytree Offline
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Lincolnshire, England
It is indeed a valiant effort but, to be honest, remove the JAP engine and insert a big twin and its like a zillion other Harleys out there.

Anybody see the British Biker Build Off from a few years ago? There was a gawd awfull looking chop on there with a new JAP engine. It was last seen being pushed and towed up and down the car park the night before the judging in a vain attempt to get it started (it never did run and then just dissapered never to be heard of again)


65 A65 bobber
A10 bitza...not (re)born yet
#355569 - 01/30/11 12:33 am Re: JAP V-Twin engined specials. [Re: trickytree]  
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trickytree Offline
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Lincolnshire, England
Well, I must say this is a turn up for the books. Although I havnt got as far as measuring up with a tape measure I didnt think this was possible. Obviously mucho chopping about has been done and the front downtubes leave alot to be desired but even so.....

No idea what the engine is however?? Seems to be 2 diferant cylinders and heads??


Last edited by trickytree; 02/07/11 12:12 am.

65 A65 bobber
A10 bitza...not (re)born yet
#355685 - 01/30/11 9:09 pm Re: JAP V-Twin engined specials. [Re: trickytree]  
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mwebb Offline
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east midlands, england
The engine is an alloy Mark 1 or Mark 2 JAP.
Aluminium cylinder heads,cylinder barrels,rocker boxes and magnesium crankcases & timing cover.

#355722 - 01/30/11 11:33 pm Re: JAP V-Twin engined specials. [Re: mwebb]  
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trickytree Offline
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Lincolnshire, England
Ahh, wish you could still get one for 200 quid... Clicky

Still cant make out if the frame has been extended...the bottom rails have been spread (or removed) so the cases sit pretty low but even so there seems to be room to spare.


65 A65 bobber
A10 bitza...not (re)born yet
#356086 - 02/02/11 1:00 am Re: JAP V-Twin engined specials. [Re: trickytree]  
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Matt smith Offline
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West Chester, pennsylvania. US...
Tricky tree: not two different cylinders and heads, same one just one facing left and one facing right - the carbs point towards the center and the exhaust pipes are on the front and rear.

Overandout - maybe it's not your first choice of styling, but I think that BSA Jap, (JaPeeza?) looks amazing. Love the girder front end. Wonder iof that tank had to be cut to allow room for the cylinder head? Where'd you find that picture, were there any more angles?

matt


meandthismotorcycle.blogspot.com
smokeandthrottle.blogspot.com
Triumphs and BSA's, a few... I'm a hoarder.


“I don’t mind the Ten Commandments, I believe in the Ten Commandments. The first one, ‘I am the Lord thy God,’ is a great commandment—if it’s not said by the wrong people.”

—Bob Dylan, introducing the song “Masters of War” at New York City Town Hall, 12 April 1963.
#356205 - 02/02/11 5:54 pm Re: JAP V-Twin engined specials. [Re: Matt smith]  
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mwebb Offline
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east midlands, england
"Yes" this engine does indeed use the same alloy cylinder head casting on both cylinders.
I recently looked at a brand new pair of these cylinder head castings when i visited MFC Patterns & Castings in Doncaster, UK. The website is at http://mfcpatterns-castings.co.uk

#356262 - 02/02/11 11:18 pm Re: JAP V-Twin engined specials. [Re: ]  
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trickytree Offline
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Lincolnshire, England
Overandout...I've got a A7 rigid frame but wouldnt like to put a hulking big V-twin in there what with its 1" diameter tubing. Might have found a suitable A10 S/A frame however (one of the nicest looking bike frames around in my humble opinion), hopefully going to see it soon if work slows down a bit.

Also been in touch with MFC and will be paying them a visit so that should give me plenty to think about.


65 A65 bobber
A10 bitza...not (re)born yet
#356276 - 02/03/11 1:21 am Re: JAP V-Twin engined specials. [Re: trickytree]  
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Matt smith Offline
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West Chester, pennsylvania. US...
Overandout. Nice work. Thanks for the details.


meandthismotorcycle.blogspot.com
smokeandthrottle.blogspot.com
Triumphs and BSA's, a few... I'm a hoarder.


“I don’t mind the Ten Commandments, I believe in the Ten Commandments. The first one, ‘I am the Lord thy God,’ is a great commandment—if it’s not said by the wrong people.”

—Bob Dylan, introducing the song “Masters of War” at New York City Town Hall, 12 April 1963.
#356933 - 02/07/11 12:49 am Re: JAP V-Twin engined specials. [Re: trickytree]  
Joined: Jun 2005
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Bucket15 Offline
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NC
A friend of mine is building this beastie:

'37 J.A.P. flathead with somewhat modified BSA Y model front frame section, M20 rear section and Burman box.
Mocked up here on the bench but hopefully on the road sometime before the next century...


Piles and piles and piles...
#357013 - 02/07/11 4:01 pm Re: JAP V-Twin engined specials. [Re: trickytree]  
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Shades34 Offline
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MN
Bucket, that is very cool. I hope your friend gets to work on it and shares with us.

#357334 - 02/09/11 7:09 pm Re: JAP V-Twin engined specials. [Re: trickytree]  
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trickytree Offline
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Lincolnshire, England
As above, great looking bike, love it.


65 A65 bobber
A10 bitza...not (re)born yet
#360586 - 02/28/11 8:50 pm Re: JAP V-Twin engined specials. [Re: trickytree]  
Joined: Jan 2009
Posts: 437
expresidente Online content
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Germany North
Hello guys
I don`t have much to do with old JAP engines. They are not very common here in Germany, so you not gonna find them on the road. But its always something special when you have the chance to meet somebody with that kind of bike. The last time i heard one alive was at BSA Rally IOM . There were some dudes from Wales with an old Navy Truck, full of Scramblers, most brit bikes. They were out for a trail event. The most exiting one was a JAP fired Monster with 1300 cc, as the owner said. When he went out with the bike, it sounded like a blody hellicopter! What a marvellous sound that was; i will never forget. Does anybody knows more about that engine?
Greets Dieter



#360599 - 02/28/11 10:29 pm Re: JAP V-Twin engined specials. [Re: trickytree]  
Joined: Jun 2009
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trickytree Offline
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Lincolnshire, England
I would be quite happy blatting around on that. Is that an International frame? Brake lug on the right of the forks is for Inters only isnt it?


65 A65 bobber
A10 bitza...not (re)born yet
#361255 - 03/04/11 8:09 pm Re: JAP V-Twin engined specials. [Re: expresidente]  
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mwebb Offline
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east midlands, england
Looks very much like a JAP DTZ industrial engine, 1323cc, 60 degree S.V. air cooled v-twin,dry sump lubrication,bevel-driven magneto, used in railway inspection trolleys.
These engines can be converted to over head valve spec using conversion cylinder barrels which allow OHV cylinder heads to be fitted.

#361732 - 03/07/11 6:05 am Re: JAP V-Twin engined specials. [Re: trickytree]  
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Duncan Rogers Offline
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Australia
A mate of mine in South Australia is building 1200cc JAP engines. His name is Greg Summerton & you can see pics of the engine on facebook.


1968 B44 Shooting Star
2004 Triumph Sprint RS
LCR GSXR Roadrace sidecar
#362249 - 03/10/11 11:09 am Re: JAP V-Twin engined specials. [Re: Duncan Rogers]  
Joined: Oct 2010
Posts: 35
nick nick Offline
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Melbourne, Australia
Originally Posted By: Duncan Rogers
A mate of mine in South Australia is building 1200cc JAP engines. His name is Greg Summerton & you can see pics of the engine on facebook.


here's a link to Gregs handywork: http://www.eurospares.com/greg.html

#362257 - 03/10/11 1:36 pm Re: JAP V-Twin engined specials. [Re: trickytree]  
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johnm Offline
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New Zealand
Greg posts here sometimes under the name Grog.

He is making me one of his 4LS Manx brakes for my Dommie.

John

#369432 - 04/22/11 9:50 am Re: JAP V-Twin engined specials. [Re: johnm]  
Joined: Nov 2010
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mwebb Offline
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east midlands, england
If anybody knows where I can find a JAP DTZ engine that is for sale please mail me, I have a friend wanting to build a DTZ engined special hence the search for an engine. The plan is to convert it to OHV spec using cylinder heads & cylinder barrels that are available from MFC Patterns & Castings in Doncaster.

#375731 - 05/27/11 5:54 pm Re: JAP V-Twin engined specials. [Re: trickytree]  
Joined: Jun 2009
Posts: 197
trickytree Offline
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Posts: 197
Lincolnshire, England
Been on the phone to MFC today and they are just about to cast the first batch of Mk.11 crankcases, should be ready in about a month. There going to be in ally not the original magnesium but that Ok. Picked up a very suitable (ie very cheap!) A10 frame with damaged downtubes and a slight twist in the headstock so I can hack away at it with no fear of rivet counters lynching me. Also picked up a AMC gearbox case as I think it is a tad shorter than a BSA box so should give me a little bit more room, would love to squeeze it into a stock length frame.

Will be using a Harley crank and rods...been done before apparently...stroke is similar. Only thing im not happy about is exposed valve gear, not sure on that one untill I see a head casting in front of me.


65 A65 bobber
A10 bitza...not (re)born yet
#379252 - 06/16/11 1:35 pm Re: JAP V-Twin engined specials. [Re: trickytree]  
Joined: Nov 2010
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mwebb Offline
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mwebb  Offline
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Posts: 39
east midlands, england
Just looked at the photos of the new MK2 JAP crankcase castings on the MFC website http://mfcpatterns-castings.co.uk
They look very nice!

#379311 - 06/16/11 7:53 pm Re: JAP V-Twin engined specials. [Re: trickytree]  
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trickytree Offline
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trickytree  Offline
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Lincolnshire, England
They look rather chunky dont they....plenty of meat around the main bearing area. Will go and have a look when heat treatment is done...shouldnt be long now as it was nearly a month ago when I last spoke to MFC.


65 A65 bobber
A10 bitza...not (re)born yet
#396730 - 09/29/11 6:51 pm Re: JAP V-Twin engined specials. [Re: trickytree]  
Joined: Nov 2010
Posts: 39
mwebb Offline
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mwebb  Offline
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east midlands, england
I have just looked at some photos of the Brough Superior used recently to set a new speed record in the VGA Vintage Class at the Bonneville Speed Week, average speed set 124.98mph.
If you look at the engine used it appears to be a MK2 JAP engine!

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