Landracing Forum

Bonneville Salt Flats Discussion => Build Diaries => Topic started by: AHG on March 20, 2009, 01:08:41 PM

Title: Jawa Bonneville Project
Post by: AHG on March 20, 2009, 01:08:41 PM
Hi All, :-D
It's not much yet, but enclosed is the beginning of my project.
ENGINE-Jawa Model 870, 625cc, 1 cylinder, 4 valve OHC, 12.8:1 comp., 6 speed, counterbalanced, liquid cooled, dry sump. (currently the only one in the U.S.) Approx. 80HP

FRAME-replica British Seeley style roadrace frame ( www.framecrafters.net ), but with 38 degree steering angle, and + 4" swingarm.

FORKS-brand new take offs from 2008 Kawasaki ZZR600

WHEELS-mag wheels from Aprilia RS250

Roughly guessing, the bike should weigh in at under 300 lbs.

Will find someone lighter than a 250+lb guy in bib overalls to do the riding.
650 A-AG
650 APS

As with all things mechanical, completion date depends on $$$.
However, it should be returning home as a roller in the very near future.

See ya this fall at BUB either way.


Title: Re: Jawa Bonneville Project
Post by: John Noonan on March 20, 2009, 02:03:59 PM
Looks good Drew.... :-D


J
Title: Re: Jawa Bonneville Project
Post by: 55chevr on March 20, 2009, 02:31:11 PM
I like bib overalls
Joe
Title: Re: Jawa Bonneville Project
Post by: oz on March 20, 2009, 02:52:22 PM
I like Pies  so maybe i may be getting towards 250 and that is a Lovely motor to be using.You Using Methanol I hope.Mate of mine runs a Jawa Sprint bike over here and gets some real good times,Anything I can do in the U.K.to help giz a mail and I will see what I can do
Oz
Title: Re: Jawa Bonneville Project
Post by: Uncle Jimbo on March 24, 2009, 02:29:48 PM
Sounds and looking good Drew - I love the 300lbs with the power that Jawa should put out. Did I hear correct, you are making a down draft manifold for it ?  Please keep the pics coming as it progresses.

Jimbo    :-D   
Title: Re: Jawa Bonneville Project
Post by: Rocky R on March 24, 2009, 10:17:51 PM
Hey Drew, I raced a Jawa for a number of years...

(http://i92.photobucket.com/albums/l24/Rockjok6/rockyspeedway.jpg)

This one was 500cc on methanol. I had two that were identical. Also had a couple of Weslakes. The Jawas were awesome Speedway bikes. Can't wait to see your "special built" Jawa on the salt. I hope it doesn't run total loss oiling like ours  :-D

Best of luck!

Rocky
Title: Re: Jawa Bonneville Project
Post by: Nortonist 592 on March 25, 2009, 01:14:38 AM
"Dry sump"   I run an old total loss (oil that is, not the motor) Weslake.  Does that motor run plain bearings?  Good luck with the build.
Title: Re: Jawa Bonneville Project
Post by: AHG on March 25, 2009, 04:53:03 PM
Hi Guys,
    Please let me answer a few questions with one note.
First, nice speedway picture Rocky. You should try a few laps on a  new laydown short stroke Jawa.
Much lighter, and you're on the pipe & sideways before you know it.
I too own 2 Weslakes, 1 Godden, 2 Jawa laydowns, and a GM laydown.

HOWEVER, the Jawa engine I'm using in the landspeed bike is NOT originally designed for speedway,
but for roadracing and sidecar motocross.

Dry sump means it has an internal oil pump and external oil tank.
Kind of like the bikes I've made my living with i.e.-Hogley-Davidstone
See the pictures in my first post and notice there are no fins.
All 500 speedway engines are air cooled, and this 625 is liquid cooled.

See Ya
Title: Re: Jawa Bonneville Project
Post by: AHG on April 03, 2009, 06:19:38 PM
Hi All,
    I received a couple new shots of my frame progress;
so I thought I'd pass them along.
All that is left for www.framecrafters.net to do is mount rear shocks,
and fabricate an aluminum fuel tank.
Then I get the roller back home to do on all remaining work.

I am very pleased with the bike so far, and suggest framecrafters to others.

See ya :-D
Title: Re: Jawa Bonneville Project
Post by: AHG on April 03, 2009, 06:20:50 PM
Another frame picture
Title: Re: Jawa Bonneville Project
Post by: Jonny Hotnuts on April 03, 2009, 06:33:57 PM
I really like seeing this project.

Its also good to see that you also take full advantage of having a "shop dog"

Most of the "ole timers" wont understand this but here is my version of a Jawas I knew as a kid... :-D

(http://images1.wikia.nocookie.net/starwars/images/thumb/6/6f/Jawa1.jpg/250px-Jawa1.jpg)

When I saw you were building a Jawa B-ville these are the only thing I ever knew a Jawa to be~

Title: Re: Jawa Bonneville Project
Post by: trialsguy on May 01, 2009, 10:18:45 AM
Test post for troubleshooting the forum. :cheers:


(http://www.lewisportusa.com/Images/4rt_260_ecu_cam.jpg)
Title: Re: Jawa Bonneville Project
Post by: AHG on May 02, 2009, 02:16:30 PM
Hi Everyone,
    I just got back from Framecrafters www.framecrafters.net  in Illinois, and picking up my rolling chassis. They did a fine job on the whole thing. The fuel tank looks large, but volumewise does not hold as much as appears. There is a tall arched tunnel section underneath for clearance of the downdraft carb and velocity stack that will protrude into it considerably.
Now comes all the rest of the fun building. I will proceed as money allows, but at least now the bike is at home in MY shop, and I can begin machining things such as various mounting brackets and rear sets, etc.
See Ya
Drew

The picture is of the crew that built my chassis-Right to Left:
Randy Illg, Carson Illg, Jason
All great fabricators and welders.
Title: Re: Jawa Bonneville Project
Post by: AHG on May 02, 2009, 02:18:34 PM
This picture is with my teenage son for an example of size.
He is 5" 11" & 150lbs.
Title: Re: Jawa Bonneville Project
Post by: fredvance on May 02, 2009, 02:48:52 PM
Are you going to put shocks on it or run rigid?
Title: Re: Jawa Bonneville Project
Post by: AHG on May 02, 2009, 09:29:54 PM
I am having shocks built in three weeks,
and I am also going to fab up a pair of adjustable length struts.
This way I can run the bike either way to determine what handles best for the salt conditions,
and puts the most power down.

The shocks will be designed with a softer compression, and stiffer rebound,
and built according to the weight used.

The soft compression is easy on the rider (if salt is rough),
and quick/stiff rebound puts the traction back to use faster.
At least that's my theory.

Thanks for the interest :-D :-D :-D



Title: Re: Jawa Bonneville Project
Post by: fredvance on May 02, 2009, 09:35:51 PM
Sounds like you are on the right track.
Title: Re: Jawa Bonneville Project
Post by: beerbellykelly on May 06, 2009, 08:07:46 PM
great project-your frame came out mint.

my friend 'east end' lee-[im in london] runs a 500cc JAWA in a replica norton featherbed frame with a czech built  seonara 6 speed box-at SPA-FRANCORCHAMPS-he was clocked at 148mph-in 5th gear-

good luck with your build,i think your choice of single cylinder engine could proove very wise-

P.J.
Title: Re: Jawa Bonneville Project
Post by: Larry C on May 06, 2009, 10:13:37 PM
You might look into Progressive 440 Shocks. They use an Edelbrock Patened I.A.S. dampening system. (Inertia Active System) it really works great and you can get several different springs as well. The I.A.S. is explained on their web site.
Title: Re: Jawa Bonneville Project
Post by: AHG on May 07, 2009, 02:34:08 PM
Hi Larry,
    I'm working with Tom Edison from Works Performance.
As soon as I finish filling out the spec sheet he sent,
they will build me shocks to suit all the bike's and rider's particulars.

Next on the list is the fiberglass, and I think I'm going with the Can-Am Fairing.

However, I have also been mulling over...
Title: Re: Jawa Bonneville Project
Post by: Luckyontheducky on August 05, 2009, 08:17:22 PM
I thought you were going to build the world's fastest DUCATI??!!