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J.A.P. UCZ . 600 .

J.A.P. UCZ . 600 .

Postby Matt Spencer » Fri Feb 28, 2014 9:29 pm

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1954 J.A.P. ' sports ' 600 S. V. according to the Codes , whith the New Fangled Oil Pump Lubrication and the Dry Sump . Theres Three oil pipes in under there .

Found out in the Hills from Gundagai , N. S. W. , sitting in a scrap pile , brought back to the Big Smoke , as hand baggage on the Greyhound . Sprayed it with WD40 7 took the pictures , so ' As Found ' .
any info on tuneing these suckers , would be wellcomed . Thinking a 1 1/4 Carb would be about right .
The Japanese response to ' styling ' , was to add more .
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Re: J.A.P. UCZ . 600 .

Postby Rohan » Fri Feb 28, 2014 10:00 pm

1 & 1/4" is huge for an old sidevalve.
That manifold looks about 3/4 " ?
Ex-railway motive power ?
"tuning" it being a relative term, we hope, these were old thumpers par excellence.
Would have been sold as an industrial engine...

It would be wise indeed to strip it all down and remove all rust, gunge and hornets nests inside before doing anything with it.
It may be as clean as a whistle inside, but you'd be lucky - and not the first to destroy an old treasure through a hasty resurrection.
It only takes one grit in the bearings or rings, or one blocked oilway to make them rather second hand rather quickly.

Nice find.

P.S. Were JAP still making these by 1954.
Will have to dig up some codes....

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Re: J.A.P. UCZ . 600 .

Postby ntst8 » Fri Feb 28, 2014 10:49 pm

The Norton 16H (500 sidevalve) has a 1" carb. I think the Big 4 (600 or so depending on the year) also a 1" and the BSA M21 1 1/16".
3/4" sounds small but 1 1/4" sounds on the large side.
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Re: J.A.P. UCZ . 600 .

Postby Rohan » Fri Feb 28, 2014 11:28 pm

Don't forget that this was likely sold/supplied as an industrial engine.
I had a BSA M20 engine that was similarly supplied/converted, with a constant throttle carb,
(convoluted looking big brass thing) and it was something like 7/8", with a butterfly.

Matt will have to measure that inlet manifold and report.
Motorcycle use could likely use a bigger carb than industrial use one...

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Re: J.A.P. UCZ . 600 .

Postby Matt Spencer » Sat Mar 01, 2014 5:17 pm

Heres a J.A.P. identification chart : www.donaldantiquerototillers.com/JAPEngineChart.htm

just measured the ' manifold ', at the moment its 1" bore . Willneed the 1 1/4 " if Im to get 100 mph down Sulby Straight . ! :)

havnt rotated it yet , first stage will be get the head off , & move out the Redbacks & Tarantulas . :(
the muffler was stillmint & painted ,if not the header pipe . So Im hopeing it hasnt seen a lot of use .
Apparently some outfit still carries spares for them , so shouldnt be a lost cause entirely .

Hopefully find a old chassis thats suitable , though theyre seldom 20 bucks these days - so a ridgid wouldnt be to hard to knock up
if it comes to that .Coustom built with a rice burner front end & 4 speed trans . Maybe . . . one day . . . .
The Japanese response to ' styling ' , was to add more .
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Re: J.A.P. UCZ . 600 .

Postby Rohan » Sun Mar 02, 2014 4:05 pm

Matt Spencer wrote: Will need the 1 1/4 " if Im to get 100 mph down Sulby Straight . ! :)


Good luck with that - you'll need it !!
Don't do anything irreversible to it in this quest.
The charm of these things is the strong thumping torque, way low down in the rev range.

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Re: J.A.P. UCZ . 600 .

Postby acotrel » Mon Mar 03, 2014 2:08 pm

Don't forget to post the graph from the dyno when you've tuned and tested it. You should have a look in the AMA rule book and see if there is a class for it at Bonneville - might take a record.
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Re: J.A.P. UCZ . 600 .

Postby cjandme » Wed Mar 05, 2014 7:40 am

Nice save Matt, thanks for posting it up here. I will be looking forward to seeing how the tear down goes.
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Re: J.A.P. UCZ . 600 .

Postby Matt Spencer » Wed Mar 05, 2014 11:33 pm

the UCZ Engine Manual pdf http://howard-rotavator-spares.com/pdf/ ... ndbook.pdf

manadged to strip it , most v good . some dampness in the case . further inspection reqired . pistons still rather stuck - will use a press there .

J.A.P. type manifestation : http://www.avmz31.dsl.pipex.com/ht/japident.htm

J.A.P. kitsets : http://www.mfcpatterns-castings.co.uk/

Speedway Outfit

http://supersan.net/videos/tr/video/Wq5 ... ay-Sidecar

http://supersan.net/videos/tr/video/hk5 ... e-Classics

http://supersan.net/videos/tr/video/LkG ... n-Speedway

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one of the cylinders and head off an 1100cc alloy v twin, : http://forum.ozvmx.com/index.php?topic=11239.75

http://img.photobucket.com/albums/v70/A ... C_0483.jpg http://www.railtruck.org/


http://www.ebay.com.au/itm/JAP-600-Stat ... 7675.l2557
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36 600 sports !
http://www.ebay.co.uk/itm/Vintage-Jap-6 ... 7675.l2557

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" I've had an email from Michael Brudar who currently owns the big JAP in the above double exposure.
He says...
"..the double exposure is of my Hargreaves_JAP, built in Melbourne in the mid 30's - CS1 Norton frame, Coventry Eagle flying 8 side valve crankcases ..Dunelt heads and barrels.
The bike was used for all sorts of competition in Victoria including road racing, hill climbs and later grass track with a sidecar.
The photo below is at Ballarat road races, ridden by Dennis Skinner. "

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groovey pictures . :D

1929 350 ?? Image

clearances for W F O Operation . :? http://www.500race.org/Reference/JAP%204B%20Manual.htm

awsome resposability , no wheelies . http://www.youtube.com/watch?v=7XiNA_EYzOE with open mouth carbs on gravel . unlike some hondaboys .

https://www.flickr.com/photos/9383961@N ... 429153358/

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Last edited by Matt Spencer on Mon Apr 14, 2014 11:41 am, edited 1 time in total.
The Japanese response to ' styling ' , was to add more .
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Re: J.A.P. UCZ . 600 .

Postby Matt Spencer » Mon Apr 14, 2014 11:27 am

Image

Image
The Japanese response to ' styling ' , was to add more .
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Re: J.A.P. UCZ . 600 .

Postby Matt Spencer » Mon Apr 14, 2014 11:45 am

Whistling Icon .

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The Japanese response to ' styling ' , was to add more .
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Re: J.A.P. UCZ . 600 .

Postby Matt Spencer » Mon Apr 14, 2014 11:48 am

The Japanese response to ' styling ' , was to add more .
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Re: J.A.P. UCZ . 600 .

Postby Rohan » Mon Apr 14, 2014 3:50 pm

That looks like the link to Greg been posted here, a few times...

So, tell us, how is the 600 going ?

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Re: J.A.P. UCZ . 600 .

Postby Matt Spencer » Wed Apr 16, 2014 5:13 am

sitting dismantled in the corner of the shed dismantled awaiting cleanig . :oops: accidently rang a Gem 3 purveyor today , 600s a bit steep for a YCZ :shock: traced a parts source . Wreckers crushed the Cosworth :x theyre all in a rush in the Big City . They seem a bit odd . It must be the traffic fumes .

Those o.h.v. top ends go on the S.V. cases , Rohan .

Thinking the Iron Flywheels might not be up to the ' Ton Downt Bypass ' trip , we shall see .
The Japanese response to ' styling ' , was to add more .
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Re: J.A.P. UCZ . 600 .

Postby Rohan » Wed Apr 16, 2014 3:46 pm

Matt Spencer wrote:Thinking the Iron Flywheels might not be up to the ' Ton Downt Bypass ' trip , we shall see .


Think you're going to find the whole thing is not up to a ton.
Don't butcher it, keep away from those fumes and keep it as is and enjoy the slow pace of life.

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