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Author Topic: CB500 Four Dutch Dyke Racer ( CARB QUESTIONS )  (Read 21487 times)

Offline Tetter

  • Posts: 252
  • CB500F Café / CB750 K6 / Kawasaki Z750
CB500 Four Dutch Dyke Racer ( CARB QUESTIONS )
« on: Jan 19, 2012, 17:01:37 »
Hi all,
I have been reading along for a while, and decided to make a topic of my own.

I own my 1975 CB500 Four for 3 years now.
It was a genuine barn find, it was in a corner behind tractors and other farmer equipment.
But the nice thing was that it ran !
We hooked up some starer cables, used some startpilot, schortcutted the starting relay and it fired up almost immediately.

This is how i bought it.


I painted the tank, rough polished and painted the engine, painted the wheels black, nounted some new Conti Go tyres and mounted clipons
I do not want the bike to look to "clean" so the polishing is just done with steelbrushes on a hand drilling machine. It should look like it just came from the track, not from the showroom  8)



In my opinion the original tank was to small, and after some time I bought a Suzuki GS850 gastank, painted it matt black  and fitted it on the frame.
Also bought a nice handmade aluminium soloseat, mounted an headlight with brick guard from an Yamaha offroad bike.
All parts came from internetshops, e-bay and or smap meets


This is how I have been riding for the first year, I cannot imagine anybody on a new bought bike having more fun than me driving my own build !


In the winter I moved the electra and batterie underneath the seat, and sanded the side off the tank to bare metal.


That summer the engine broke downduring a trip with the misses on her Honda CB-1  >:( so i changed it for another one, and as i was working on it made myself a home made 4 to 2 exhaust with replica short megaton mufflers, and wrapped the exhaust with heatwrap.
As you can see on the pictures all work has to be done outside, or in my small bike shed.......



Got my hands on a complete Ducati goldline frontbrake with adaptors to fit the CB :)

This really imroved the braking, which is not the best with the original parts....
After that i also needed to impove the front suspension.
I added 2cm bushes on top of the  spring and filled the fork with 15W in stead of the original10W oil.


Unfortunately the bike has not ran properly since I have mounted the new engine.
Too bad the guy had already sold the carbs  :o  those would have been better I guess.
There is enough compression, the valve clearance looks fine, and the ignition is also spot on.
But still the bike was not running like it should, it wouldn't hit the ton !

That is why this winter a carb revision is planned, together with the mounting of an electronic ignition with Boldor coils for a better spark.
The carbs have been cleaned ultrasonic, and a complete revisionset mounted. Jets, needles, o-rings, all new and fresh :)
I now first want tof fire it up without the electronic ignition, to see if it runs. ( if not i know where to find the problem )
If she runs, I will mount the new ignition and hope for a better starting bike.

I will keep the topic updated with the improvements made this winter.

Hope you enjoyed the story so far.
Regards from the netherlands  :)
« Last Edit: Jan 03, 2013, 06:45:33 by Tetter »

Offline Rich Ard

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Re: CB500 Four Dutch Dyke Racer
« Reply #1 on: Jan 19, 2012, 17:16:44 »
That is a hell of a bike - hope you get your carb woes sorted out. Do you have more pics/info about your exhaust work? I really like those headers.
unplug the connectors from the harness and multimeter the shit out of them

Bad Points, a comic :: CB450 Restomod (sold) :: Viragostrosity :: GL1000 daily rider :: Kaw 175

Offline Erskine

  • Posts: 2163
Re: CB500 Four Dutch Dyke Racer
« Reply #2 on: Jan 19, 2012, 17:28:38 »
That's a mean looking build. I like your style.
+1 on hoping you can get it running sweeter.
:)

Offline chenzzo

  • Posts: 17
Re: CB500 Four Dutch Dyke Racer
« Reply #3 on: Jan 19, 2012, 17:53:01 »
Love it.  I love a bike that looks both loved and used at the same time.  That's how it should be.

Offline Cafe Redneck

  • Posts: 352
Re: CB500 Four Dutch Dyke Racer
« Reply #4 on: Jan 19, 2012, 18:25:48 »
 Good lookin bike

Offline Tetter

  • Posts: 252
  • CB500F Café / CB750 K6 / Kawasaki Z750
Re: CB500 Four Dutch Dyke Racer
« Reply #5 on: Jan 20, 2012, 10:12:41 »
Thanks for the positive replies.  :)

I already have some plans to perform when the engine is running smooth again.

As I run open carbs I need to have some kind of rear fender, but I'm not fond of the original plastic one.
I'm thinking of mounting an Aluminium plate as on the below pictures.


« Last Edit: Jan 20, 2012, 13:00:35 by Tetter »

Offline Tetter

  • Posts: 252
  • CB500F Café / CB750 K6 / Kawasaki Z750
Re: CB500 Four Dutch Dyke Racer
« Reply #6 on: Jan 20, 2012, 10:26:01 »
After that I want to get the rear swingarm out, replace the bushes for new bronze ones and reinforce the arm.


I really like this one ! It really stands out, but I'm not sure if it will work with the brake rod ( from the pedal ) and the chain.
The chain should go beneath the original arm, and over the "brace" I guess.
I'm sure the brake drum arm can still fitt on the original mount.

I think on buying an extra swingarm to experiment a bit  ::)

If it does not work, I could go with a less visible version.

Offline Ritz cracker

  • Posts: 132
Re: CB500 Four Dutch Dyke Racer
« Reply #7 on: Jan 20, 2012, 22:41:38 »
is that the same tank? if so im diggin the knee dents great job

Offline Tetter

  • Posts: 252
  • CB500F Café / CB750 K6 / Kawasaki Z750
Re: CB500 Four Dutch Dyke Racer
« Reply #8 on: Jan 21, 2012, 04:20:05 »
I wish it was.... ::)

Sure looking for a Tank with knee dents, but as I also would like to keep the sides bare metal those would have to be hammered in. The dents on the last picture look like they have cut them out ,and welded in new material.

Offline Tetter

  • Posts: 252
  • CB500F Café / CB750 K6 / Kawasaki Z750
Re: CB500 Four Dutch Dyke Racer
« Reply #9 on: Jan 22, 2012, 13:52:02 »
Just a pic from my phone of how's she looked after mounting the Ducati Brembo brakes.


She's at the same place in the shed right now.
Wanted to fire her up this saterday, but I strained a mussle in my chest on thursday and need to take rest for a week !
( nice pain medication though....... :o )

Next week I'll fire her up  ::)