Messages

1

CZ / CZ 1973 front forks set up

« on: October 04, 2024, 06:51:34 am »

Just making a record of my attempts to improve the soft front end on my 73 380.

Forks appear standard except for the addition of `top hats' at the end of the springs. The top hats where an upgrade from back in the day apparently.

30 weight oil.  170 ml per leg.  And 10mm spacer at the top of the spring, under the cap.

Feels much better in the garage tests.

Pete

2

For Sale / Husqvarna chain sliders / defense 1981 to 1984

« on: July 05, 2024, 08:27:51 am »

Hi Guys,

We have been able to remanufacture chain sliders for the swingarm. Made from Australian industrial quality polyurethane. Super Tuff. The template has been taken from an original OEM part. I have put details and photos up on the facebook sites like OZVMX and Hunter Classics so you can see the material and fit up on my 430 CR.
$40.00 AUD plus post from Wollongong NSW Australia.

email is [email protected]

3

Husqvarna / Re: Husqvarna chain sliders / defense 1981 to 1984

« on: July 05, 2024, 08:25:54 am »

Pete,

Thanks. I have sent quite a few out all ready. I hope to be going to CD so should bring some there too.

 Managed to get an original OEM sliced for the 1986 style single shock Huskies for Sweden just now, will be making them if there is any interested.



Pete

4

Husqvarna / Husqvarna chain sliders / defense 1981 to 1984

« on: June 26, 2024, 07:39:37 am »

Hi Guys,

We have been able to remanufacture chain sliders for the swingarm. Made from Australian industrial quality polyurethane. The template has been taken from an original OEM part. I have put details and photos up on the facebook sites like OZVMX and Hunter Classics so you can see the material and fit up on my 430 CR.
$40.00 AUD plus post from Wollongong NSW Australia.

email is [email protected]

5

CZ / Re: 981 Clutch oil seals and tank colour and JETS

« on: May 08, 2024, 03:42:46 pm »

cheers Pete

6

CZ / Re: 1973 PARTS BOOK

« on: March 19, 2024, 06:59:19 pm »

I have made a copy from the 1974 original parts book - if you would like let me know - i tried putting it here but it wouldn't stick. Kind regards Pete

7

CZ / Re: 981 Clutch oil seals and tank colour and JETS

« on: March 19, 2024, 06:53:17 pm »

Improved again.

50 pilot and 300 main and then raised the needle one step by dropping the clip one grove down from the middle groove....

Cheers

Pete

8

CZ / Re: 981 Clutch oil seals and tank colour and JETS

« on: January 27, 2024, 01:35:12 pm »

27..01.24 jetting changed which improved it a lot.

Original 25 pilot changed to the 37.5 and now a 45. Great improvement.

After that it was still prone to increased revs by itself just above quarter throttle.

So left the Q5 in and replaced the 6F5 needle with a 6FJ6 (both middle clip)  No more self over rev.

Ridden around street, hot, but will need to get a track day to maybe increase the Main from the 280. See how we go.

Cheers
Pete

9

CZ / Re: 981 Clutch oil seals and tank colour

« on: January 21, 2024, 02:23:44 pm »

JET SPECS TAKEN FROM SPREADSHEET PROVIDED IN THIS THREAD

CZ 125 MX -72   VM 32   200   35   Q6   5FJ9   -   3.0   
CZ 250 MX -66   VM 32   240   35   Q6   6FJ6   -   3.0   
CZ 250 MX -66   VM 34   230   35   Q8   6FJ6   -   3.0   
CZ 250 MX -71   VM 34   210   35   Q5   6DP5   -   
CZ 250 MX -72   VM 34   240   40   Q8   6FJ6   -   3.0   
CZ 250 MX   VM 34   210   35   Q5   6DP5   -   
CZ 250 MX   VM 36   260   35   Q5   6FJ6   -   1.5   
CZ 250-380 MX   VM 34   300   40   Q6   6FJ6   -   2.5   
CZ 250-380 MX   VM 34   310   45   P8   6DH3   -   
CZ 360 MX -67   VM 34   250   35   Q6   6DP5   -   
CZ 360 MX -67   VM 34   230   45   Q6   6F5   -   2.
CZ 360 MX -67   VM 34   240   40   Q8   6FJ6   -   2.5   
CZ 380 MX   TM 36   290   45   Q6   6FP17   -   
CZ 400 MX   VM 34   230   30   Q5   6DP5   -   
CZ 400 MX   VM 36   280   25   Q5   6FJ6   -   2.5
CZ 380 MX   VM 36   350   45   Q8   6FJ6   -   1.5   
CZ 380 MX   VM 34   320   45   P8   6DH3   -   
CZ 380 MX -66   VM 34   260   35   P0   6DH3   -   2.5   
CZ 380 MX -69   VM 34   320   45   P8   6DH3   -   2.5   O. Persson
CZ 380 MX -71   VM 34   230   30   Q5   6DP5   -   2.0   AMS Racing USA
CZ 380 MX -72    VM 36   290   45   Q5   6FJ6   -   2.0   R.L Dengler
CZ 380 MX -72    VM 36   270   45   Q6   6DH2      3.5   Pete Maly specs
CZ 380 MX Reed Valve   VM 36   430   45   Q8   6DH3   -   2.5   C.M.

10

CZ / Re: 981 Clutch oil seals and tank colour

« on: January 21, 2024, 02:05:13 pm »

Hi Tony,   Just back from overseas and see your last post about checking the jetting in your bike.

I noted you were using a 45 Pilot. Mine improved a lot from the 25 pilot in it to the 37.5 (which I had at home).  Just about to order a bunch of extra pilots and a few mains from Hadrick now.

I also got hold of an original 1974 owners parts list from Adrian's dad. I have made a PDF copy and a paper copy. Let me know if you could use the PDF.

Kind regards

Pete

11

CZ / Re: 981 Clutch oil seals and tank colour

« on: December 13, 2023, 04:38:04 pm »

Hi ya Tony,

Now the clutch seems fixed I got it hot and found the jetting was a little lean.

Not sure if you have a favoured mix of jets - looks like a newish 36mm Mikuni

I just took it apart again so I'll document what is in it.

Main  280

Nozzle Jet   159  Q 5

Needle  6F5

Clip was in the middle  - as of yesterday dropped the clip one down - richer and it went a lot better

Pilot - 25

Slide 2.5

Air Screw was at 1 and Half

Im going to do some searching now.

For future reference the Clutch Seals and Bearings are as follows

The 2 needle bearing inside the clutch are K 25 x 30 x 13  ( C3's )

Item 26 is an ORing 43 x 35 mm

Item 8 is an ORing  26mm ID and 2mm diameter/thick

The Kickstarter seal is an ORing  24 x 20mm

And the main seal that goes in the clutch cover is 50 x 65 x 8  double lip with a spring - I used the normal black one because the Viton was only single lip I could get and wouldn't have worked.

Cheers Pete

 

12

CZ / Re: 981 Clutch oil seals and tank colour

« on: December 07, 2023, 08:56:46 am »

Thanks so much Tony. Got a couple of them yesterday and the rest on order.

Had another win yesterday. Got hold of an original 1974 parts book. Will do electronic copy soon for who ever needs it. Super helpfull book

Cheers

Pete

13

CZ / Re: 981 Clutch oil seals and tank colour

« on: December 05, 2023, 07:35:57 am »

Thanks Tony. You are a champion.

Much appreciated.

I am in touch with my local bearing supplier and will change it to Viton etc.

Might look at that mod as well.

Kind regards

Pete

14

CZ / 981 Clutch oil seals and tank colour and JETS

« on: December 01, 2023, 10:39:58 am »

Hi Gents,

Had the 1973 380 going with new Vape Ignition. Brilliant.

New issue is oil leak behind the dry clutch.

Question - what are the sizes and or id numbers for the seal (and type maybe)  and oring/s   ?  Possible 50 x 65 x 8 mm but not sure if single or double lip, or spring etc if it matters.

Question - size of the Oring on the kick starter shaft ?

Question - I want to paint a steel tank in the original '73 Blue colour. Any idea what the colour code is or close to it?

Many thanks once again

Pete

15

CZ / Re: 1973 PARTS BOOK

« on: November 03, 2023, 06:27:38 pm »

Tony 27,

The document you supplied has been the biggest help ever. Much appreciated. the 380 is moving along very nicely. Parts arrived from CZ Stuff in the UK very well. Looking forward to 2024 with Hunter Classic VMX. Pete