Jawa / VVM [dieselmaster]

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vincentyeager
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Re: Jawa / yanmar clone

Post by vincentyeager » Tue Dec 25, 2012 12:51 pm

Hi all,

firstly: i wanted to wish everyone a jolly ol' christmas :wink:

the rear brake fixation rod turned out be sitting too loose around the rear fork.
therefore decided to go in the more original way, like a Jawa normally has its rear brake ankered.
32.JPG
rear brake anker
33.JPG
rear brake
the chain tensioners are kept original.

and the koni spring adjuster. damper adjuster is on top of the spring.

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Re: Jawa / VVM / yanmar clone

Post by vincentyeager » Sun Jun 09, 2013 1:24 pm

Because the rear brake/hub is not jawa anymore, but kawasaki (250), the chain casing didnt fit well no more.

the tunnel, to accomodate for the rear fork therefore, has to go.
34.jpg
kettingkast oud
you can see some scratch marks from turning the rear wheel, made by the sprocket bolts scraping the surface.

with the help of a paper template, cutted out a new piece of sheetmetal.
35.jpg
kettingkast nieuw
mark the gap is evenly all around, ready to fill with tag welds.

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vincentyeager
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Re: Jawa / VVM / yanmar clone

Post by vincentyeager » Sun Feb 16, 2014 2:12 pm

Here is another new sophisticated piece of VVM work, the (6*** aluminium) front brake disc spacer;

32.jpg
from scratch on the laith
33.jpg
set, shiny and done


This bike woulndt be worth the 'racing' in VVM if it would never see a circuit, better be well prepared;
34.jpg
and finally, the overal front-end;
35.jpg

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vincentyeager
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Re: Jawa / VVM / yanmar clone

Post by vincentyeager » Thu Mar 20, 2014 12:56 pm

It appears that a diesel engine dictates the need for a separate dieselpump overflow fuel line, in order to keep the pump from surging (leading to inconsistant idling/running of the engine).

Jeroen (from VVM) soddered a brass 6mm (about 1/4'' O.D.) line, that practically runs to the top of the tank.
36.jpg
in the meanwhile i've painted it again, and we are now working on the front fender.
Jeroen has hand beaten/rolled one out of aluminium (or 'aluminum' as they say in the united states of 'bankrupcy').

to be continued.

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Re: Jawa / VVM / yanmar clone

Post by alexanderfoti » Thu Mar 20, 2014 1:01 pm

Looks good. I had the same problem with mine, I ended up running the injector leak off back to the fuel supply line with a T

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vincentyeager
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Re: Jawa / VVM / yanmar clone

Post by vincentyeager » Thu Mar 20, 2014 1:10 pm

alexanderfoti wrote:Looks good. I had the same problem with mine, I ended up running the injector leak off back to the fuel supply line with a T
we wanted to do this as well, since the tank was already painted.

however with a T, you could run the risk of getting the mentioned surge, air bubbles that circulate through this by-pass all the time.
so we did it properly just to be ahead of this possible issue.

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Re: Jawa / VVM / yanmar clone

Post by alexanderfoti » Thu Mar 20, 2014 1:25 pm

vincentyeager wrote:
alexanderfoti wrote:Looks good. I had the same problem with mine, I ended up running the injector leak off back to the fuel supply line with a T
we wanted to do this as well, since the tank was already painted.

however with a T, you could run the risk of getting the mentioned surge, air bubbles that circulate through this by-pass all the time.
so we did it properly just to be ahead of this possible issue.
That is true, I had this problem.

Luckily, due to my pipe layout, any bubbles make their way back to the tank, its kind of a double U layout.

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Re: Jawa / VVM / yanmar clone

Post by coachgeo » Thu Mar 20, 2014 4:49 pm

There are inline fuel filters for petrol vehicles that have a third port. In, Out and Out. They are used to bleed fuel vapor back to the tank to prevent vapor lock.

would suspect one could put one of these inline with the IP / Injector bleed fuel line before you "Tee" it to the fuel feed line. Mount it so it the bleed OUT port is the upper most port so air will bleed up and out of it. Run a tube from this into top of your tank as alexanderfoti did or heck even to top of your Fuel cap like the old Dirt bikes did.

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Re: Jawa / VVM / yanmar clone

Post by vincentyeager » Thu Jun 05, 2014 9:03 am

We decided to use an original diesel dynamo, below you see the reworked and assembled flywheel to accomodate for it.
37.jpg
A side view of the bike with the dynamo flywheel fitted. The belt groove on the outer side is now free for other things ;-)
38.jpg

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Re: Jawa / VVM / yanmar clone

Post by vincentyeager » Thu Jun 05, 2014 9:08 am

Here we see the primary chainwheel being reworked to fit on the diesel crank;
39.jpg
and the primary duplex chain fitted on the bike;
40.jpg
as the chain is now longer, Jeroen made it by joining two original jawa chains.

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Re: Jawa / VVM / yanmar clone [dieselmaster 406]

Post by Tetronator » Thu Jun 05, 2014 9:13 am

Man, that really is beginning to look good... :shock: Kudos.
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Re: Jawa / VVM / yanmar clone [dieselmaster 406]

Post by alexanderfoti » Thu Jun 05, 2014 9:19 am

Agreed, looking excelent. Very good attention to detail!

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Re: Jawa / VVM / yanmar clone [dieselmaster 406]

Post by vincentyeager » Wed Jun 11, 2014 2:50 pm

Here we see a glimp of the revised electrical system, whereas Jeroen made a whole new ''cable tree''
The battery still sits in its original housing.
41.jpg
And the side view upon the delrin fusebox that Jeroen made.
He has divided the electrical system into four as displayed.
42.jpg
And here we have the revised throttle system, because we added the shut-off solenoid later on.
43.jpg

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vincentyeager
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Re: Jawa / VVM / yanmar clone [dieselmaster 406]

Post by vincentyeager » Thu Jun 12, 2014 8:16 am

the exhaust system with megaton damper;
45.jpg
do take notice of the finished engine cover;
44.jpg

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Re: Jawa / VVM / yanmar clone [dieselmaster 406]

Post by vincentyeager » Thu Jun 12, 2014 8:21 am

Here we are measuring the point of injection
46.jpg
with an angulair measuring device that Jeroen designed, and produced himself.

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Re: Jawa / VVM [dieselmaster 406]

Post by vincentyeager » Thu Oct 30, 2014 1:29 pm

Good news and some other news;

The bike has made its maiden ride and we are now handling the 'child deceases'.

It turned out that the kickstarter wasn't able to start de diesel, for its not a four stroke kickstarter. It's lacking stroke.
So ordered a brand new dieselengine with an electric starter, because pushing the bike was a total crime. yeah we've lost a few stone there.

Because the electric starter sits in front of the engine, and the jawa vvm has slightly a longer assembly than you'd have with a (comet) vario, the front end had to be changed almost fully. The frame also abit.
A kawasaki kz750 fork was fitted for it has an offset front axle. Yokes are still paoili, however Jeroen reworked the holes from 35 to 36 mm in diameter.
Caliper of this fork replaced the brembo, and the guzzi disk was changed for a gsx1100 disk which is now on the other side. Brakes well and linear. Pump's still brembo.
The fork had a WP rebuild but still needs more adaptation to make it more sporty. After all a kz is a semi chopper. The Jawa isn't (a worn out flying carpet). It does must impress when challenged by crotch rockets. Even when not challenged at all.
47.jpg
The frame tube we've made on the right side, had to go in order to make room for the electric starter. Jeroen solved this by having the dieselengine make part of the load bearing frame. stiffness is still good.

Than there's the dynamo/stator of the dieselengine, for we've let the flywheel be as is on the new engine (need the starter teeth). We know u guys have little issues with the stationairy character of it, in combination with a vario, but the Jawa VVM doesn't have a vario.
So Jeroen rewound the copper spools (increasing the amount) and it now always charges the 14 ah battery. Obviously the battery is now more important for us then it used to be. And alot bigger too.
48.jpg
Also the primary drive is changed by Jeroen (small sprocket), from a spline which kept breaking (when driving off in fourth gear :lol: dieselbike only :twisted: ) to a conical friction-like connection.
It has a conical sleeve so the crank can stay as is.
49.jpg
last but not least, the hand beaten and hand rolled aluminium front fender made by Jeroen (VVM) as well, check it out;
50.jpg
Last edited by vincentyeager on Sat Nov 01, 2014 9:02 am, edited 3 times in total.

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Re: Jawa / VVM [dieselmaster]

Post by Tetronator » Thu Oct 30, 2014 3:32 pm

Looking good Vincent! Hope to see it on the road soon.

Are you building it at VVM racing in Spaarnwoude?
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Re: Jawa / VVM [dieselmaster]

Post by vincentyeager » Fri Oct 31, 2014 8:28 am

Indeed Jeroen is situated in the idyllic village of Spaarnwoude.

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Re: Jawa / VVM [dieselmaster]

Post by Tetronator » Fri Oct 31, 2014 9:27 am

Sweet, that's really nearby for me. Might come over and take a look at it! If that's OK of course.
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Re: Jawa / VVM [dieselmaster]

Post by Tetronator » Tue Nov 04, 2014 2:02 pm

Well then, I went to see the Dieselmaster today at VVM Racing and boy does it live up to its reputation. The way its built and put together looks like it could've come from the Jawa factory itself and the bike is not even done yet! We can expect to see a really well build machine coming from Vincent and Jeroen. Its even going to be featured in a dutch motorcycle magazine called "MotoPlus". Jeroen also told me he accepts custom machine and/or build work for other diesel bike builders, at the moment he does a lot of custom machining for bike builders in the Netherlands and has shown me some impresssive work pieces.

I had a good chat with Jeroen and was impressed with his work, and finally got a place for me to get the machining done for my build... 8)
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Re: Jawa / VVM [dieselmaster]

Post by vincentyeager » Tue Nov 18, 2014 7:27 pm

Today we finished the bike, ready for the state roadtraffic test.

proud owner;
51.jpg

while driving i realized what 'the big knock' means.
this really is 'big knocking'. 'turns more heads then a harley'

greetings fellow bigknockers.

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Re: Jawa / VVM [dieselmaster]

Post by Tetronator » Tue Nov 18, 2014 8:17 pm

Congratulations on finishing it!

Now lets hope the RDW people aren't to harsh. Looking forward to the motoplus article and seeing it on the road.
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Re: Jawa / VVM [dieselmaster]

Post by alexanderfoti » Tue Nov 18, 2014 8:18 pm

Really looks to be an excellent build!

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Re: Jawa / VVM [dieselmaster]

Post by coachgeo » Wed Nov 19, 2014 5:38 am

really sweet. Much congratulations.

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Re: Jawa / VVM [dieselmaster]

Post by Dan J » Wed Nov 19, 2014 9:19 pm

Absolutely beautiful bike
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Re: Jawa / VVM [dieselmaster]

Post by pietenpol2002 » Wed Nov 19, 2014 10:22 pm

Very very nice work. And can't wait to see your next build.
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Re: Jawa / VVM [dieselmaster]

Post by Bj-torb » Wed Nov 19, 2014 10:38 pm

Nice work. Look forward to see a video of it running :-)

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vincentyeager
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Re: Jawa / VVM [dieselmaster]

Post by vincentyeager » Mon Nov 24, 2014 11:36 am

Thanks lads :D

I hereby present you this sneak preview;

https://www.youtube.com/watch?v=FfhL43AcSLg

ps. top speed thus far; 97 km/h

the speed-o-meter's precision is 1 km/h

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Re: Jawa / VVM [dieselmaster]

Post by coachgeo » Mon Nov 24, 2014 8:01 pm

look forward to your report of its comfortable cruise speed

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Re: Jawa / VVM [dieselmaster]

Post by Eddy Wane » Tue Nov 25, 2014 9:33 am

Very impressive. It has that Café Racer look.
Building the bike. Top of my list, bottom of the wife's.

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