New CZ Parts

[Ji Gantor]

Les knows what he is doing.
If you are running the engine and pipe in stock preparation what Les has supplied should work great.
The Carb on mine is a Mikuni 34mm I purchased from CR High Performance in the States. Charlie fitted a 270 main jet. I would be very interested in finding out what Les has put in yours.

But as I said Les is very good at this stuff and what ever he has given you will be the right thing.
Don't chase your tail, fit the carb and go ride it. I am sure it will produce plenty of power at sea level.

Please do let me know what les has supplied, it will be good to see if Charlie of CR suggests some thing different to Les.

Ji

[jimg1au]

ji
its not just the main jet check all out against the cz mikuni chart i sent you.ie
piolet jet
needle jet
needle
cheers
jim

[Ji Gantor]

Hi mx250,
Just for us technocrats.
So far the weight reduction from swapping out parts is 5.5kilos.
That brings the bike down to 99kilos.


Ji

[Ji Gantor]

The new rear spokes I purchased from CZ Stuff in the UK have a larger diameter than the stock CZ ones. This means that to fit them all the spoke holes on the rear hub have to be drilled out and the spoke head area has to be counter sunk or the rear sprocket will not fit over the spokes.
This was not explained on the above web site which has lead me back to John Titmans to get some more spokes made.
If any one would like some new HD s/s rear spokes for their CZ let me know as I do not intend drilling out my hub.

Ji

[Ji Gantor]

There are some after market swingarms available for CZ's and the following one is known as a CJ. I believe it is made from chrome molly and its big advantage is to stiffen the rear end, oh yeah, and look COOL. It cost about $450.00USD and weighs 3.2kilos.

Ji

[Ji Gantor]

The stock CZ 1974 swingarm is not technically a new part but this is what I am going to fit to my 1973 frame. It will stiffen up the rear end and only weighs 2.9kilos. It cost quite a bit less then the CJ and looks more at home on the bike. After all I don't want to change the look of a CZ, because the look is why I want one.

Ji

[Ji Gantor]

The stock CZ 1973 swingarm was considered to flexible because the section attaching the rear axle was just the chrome molly tube squashed flat which gives very little side ways resistance.


Ji

[GMC]

I haven't seen a square box swingarm for the Zeds before, CJ you say? Would that be C & J?

[GMC]

Those 73 & earlier swingarms with the flattened ends did flex a bit.
The 74 was a much better design keeping the full tube width axle slot.

[GMC]

Most of those photo's will not open for me.
This is my CZ / CMS replica


The bare frame weighs in around 7.8 Kg
The bare swingarm around 2.3 Kg

I also make the swingarms with the shock mounts at the rear the same as the 74, I sell them for $638.00
They are made from 4130 Cro-Mo & come complete with snail cam adjusters, needle roller bearings, sleeves & seals.

[GMC]

Not sure exactly how much the pipe weighs, most of them are around 3.5 Kg
This is a bit heavier than some of the US pipes I have seen as mine are usually thicker material (1.2mm)

[Ji Gantor]

The original CZ header pipe weighs 1054g and the Pro Form Racing muffler weighs 2300g so all up 3.35kilos. The original muffler weighed 2600g so the original exhaust system weighed 3.654kilos.
So the GMC pipe is a quality product weighing in at 3.5kilos.

Ji

[Ji Gantor]

The muffler now has two coats of heat proof paint.
I just have to wait for it to dry so I can remove the sheild so I can see how the logo came out.

Ji

[Ji Gantor]

After removing the overspray mask the logo on the new muffler looks like this.
The next time I have to paint this pipe I am going to grind the name plate off, I only did this to show what could be done.

Ji