Information

Hi to all this site is designed to help improve the quality of YZs that are being restored. If like me you will find literature difficult to find.
We at concourse parts are also using these bikes as research and development tools, To insure correct fitment of our NOS replica parts.
They are also used as promotional bikes. If you require and details on specific items bolts or surface finishes or date codes feel free to contact us.
We have restored YZs from 1974 to 1979 the above links can be viewed for each bike.

The completion of my YZ 125 D. This is a one owner bike. Purchased from Kevin Cass Yamaha in November 1976. We traded a YZ125X on this bike and never looked back.

Please note
Any image can be enlarged by simply clicking on it.

YZ 125 D Completed.

  

Finished 10/10/2006

 
 
  

Finished 10/10/06

  

Rear shock.

 
 
 
  

Parts back from platers.(ZINC plating silver)

Rear wheel& sprocket

 
  

Rear Wheel.

  

Number plate height.

  

Number plate width.

  

front number plate

  

Number plate

  

Front Wheel Bare

  

Front Wheel.

  

Sprocket 1W1 2545100

 
  

RH Side cover before shot.

 
  

Paint stripped and sanded.

  

Before shot.

  

Plastics YZ 125 D

Well here we go on the plastics, what a lot of fun this is .
Twenty nine years old and all original. And stained yellow.
What do you do with this you may ask, well here is what I have discovered in the last two weeks.

I have attempted all sorts of things, from scraping,sanding,heatguns,paint stripper,
Plastic refinish kits, all a lot of work.
Here is what worked for me if you are interested.

1. Clean plastic with Jiff and scotch brite,dry of.
2. Scotch brite and a mix of GP thinners and prepsol 75% THINNER 25% PREPSOL.

3. Rub all over , this will bring back the white of the YZs.
4. Machine buff with a good compound.
5. Clean with Jiff again and dry.
6. Machine buff with auto polish.
7. This took me 10.hours for the rear guard of my YZ not fast but it is very prsentable now, have fun with your plastic

 
 
 
  

Genuine YZ 125 D footrest.

Wheels needed

 

More parts

 

Original Decal YZ Ds

These decals measure as follows Length is 161mm. Height is 39mm.
Also note that the centre of all the letters A are white.

Bikes wanted.

The restoration of this YZ is well over due.
We will keep a record of this as it may be of use to others.
This bike has some History in Australia.
Has won Australian title.(riden by Scott Wilson)
Has been riden by Wayne Gardner in 1977 or 1978 at lithgow NSW Australia.
Was raced all its life, up untill its race retirement in 1979.
Ran on methonol fuel to improve performance.
Also had extensive port work and different exaust pipe.
Was perchased new from Kevin cass Yamaha in wollongong nsw Australia. Price $999,00 october 1976.

I intend to restore all the race bikes I have owned.
Looking for:
CR 125 M 1975 OR 1976 RED STRIP
CR 125 M 1977 M3
YZ 125 C 1975 Prefix 537
YZ 125 X 1975 Prefix 1G8
YZ 125 D I am looking for one more of these. 1977 prefix 1W1
YZ 125 E Prefix 2K6
YZ 250 F 1978 Prefix 2X4
YZ 400 F1978 Prefix 2X5
If anyone can help with any of these bikes or parts it would be appreciated.

More parts.

 

Engine top going on all is well.

 

Working with MULTI-MOUNT.

ENGINE PARTS.

 

30/3/06 ENGINE TIME.

 

YZ 125X - Fresh out of the Crate.

This is my 4th race bike.

Below shot is my YZ 125 X IN RACE TRIM. 1976.
Front number plate changed.
Over guard added.
Running on Methanol.
Port work. Reed valuve change.
Gearing change.

Paint the hubs semi gloss black. 25/3/06

Paint stripper pressure washing.

OK! so you want to prepare and paint your own hubs.
Get your paint matched first.
1. Use a top quality paint stripper. Either WATTYL OR CAM. These are both used in the AUTO trade and both of high quality.
2. Apply liberally, then allow to penatrate the paint for approx 15 minutes.
DO NOT let it dry.
Caution on the substraight (surface) as any scratches will be seen in the top coat.
So don't use paint scrapers and coarse paper, 40 grit etc.
I recommend to use a hot water pressure washer to remove the paint and clean all at once.
This process may have to be repeated if substraight is not paint free.
3. Once clean and free of paint, use a scotch brite to remove any creep marks.
If you have to use sand paper, no coarser that 600 wet/dry.
Fill any inperfections with AUTO body filler and finish with 600/wet/dry paper.

4. Now you are ready to paint.
5. Degrease the substraight with prepsol or equivalant.

Please note: Most of these parts are NOT primed during manufacture if you take note when stripping you will notice no primmer.

6. I recommend a single pack etch only no primmer surfacer.
Why? Because the film build it too thick and is more susceptable to stone chips and damage when re lacing the wheel.
7. Matching the flat black paints. If no experience in colour matching, go to your local panel-beater with a sample second hand hub. Or do it before you start.
The paint: Most of this paint is industrial quality and not avaliable to the public.
What to use.
The best all round paint is acrylic lacquer. This is easily available and quite easy to use.
Quick drying, cheap and user friendly.

Paint the hubs and backing plates.

 

Parts Required

Rear Wheel
* Puller chain ajust x 2 ------------ 537-25388-00
* Rim band rear ------------------ 94325-18043
* Rim rear (1.85-18E) -------------94418-18141 (DID) NLA????
* Sprocket rear (49T) ------------- 1w1-25449-00
* Tyre rear (IRC) 410x18 4 PR---- 94141-18171
* Spoke set------------------------ 537-25304-00 Located AUS
* Chain 98L------------------------ 9415-20098
* Seat----------------------------- 1w1-24770-90 Located USA
* Sest cover----------------------- 1w1-24771-00 Located USA
* Exhaust pipe ass'y --------------- 1w1-14610-01 Located USA
* Puller bolt x 2---------------------90101-08034 Located AUS
* Puller nut x 2 ---------------------95301-08700 Located AUS
* Washer sprocket x 3-------------- 1G8-25412-00 Located AUS
* Washer wheel bolt----------------- 90201-15238
* Air cleaner element 2--------------1W1-14450-01 Located AUS
* Clip carb cable 29------------------363-14137-00 Located AUS
* Pipe carb 48-----------------------310-14197-00 Two required
* Pipe bowl 49-----------------------493-14196-00 one required
* Tensioner 21-----------------------1W1-22178-00

GASKETS
* Barrel Base 18----------------------1W1-11351-00 YES
* Head gasket 20---------------------1W1-11181-00 YES
* Clutch cover 7-----------------------1W1-15451-00 YES
* Timming case 3----------------------1W1-15421-00 ORDERED
* Reed valve 23------------------------311-13621-01 Yes

RUBBERS
* Gear lever 2--------------------------132-18113-01 YES
* Joint Carb 17-------------------------1W1-13565-00 ORDERED
*

New home in factory.

What we have now.

This is the place where the restoration will take place.
I will keep a detailed list of exatly what is going to happen.
From part finding to painting of all the components.
I have a detailed list of parts required, if any one can help it
would be appreciated.

Cob webs

 

First Daylight 13 years.

 

First daylight 13 years

 

Lets get started March 2006

The day has arrived, here are the first day light photos since 1993.
This bike has been in storage for 13 years.

WEB SITES

Here is a list of sites that will be of great assistance for any rebuild.

www.yz250e.blogspot.com
www.mxworksbike.com
www.users.bigpond.com/mxrestore/index.htm
www.speedandsportinc.com
www.vmxmag.com.au
www.vintagemotocross.biz
www.yamaha-motor.com/sport/parts/home.aspx
www.stadiumyamaha.com
www.yzclassic.com
www.bikesales.com.au
www.ozvmx.com
www.nwvintagecycleparts.com
www.vintagemotorcycleplastic.com
www.multimount.blogspot.com
www.newinventions.com.au
www.hsvgrange.blogspot.com
www.myscrapbookingpages.blogspot.com



1974 YZ A

YZ 80 A SERIAL # 462-000101 - 009661
YZ 125 A SERIAL # 453-000101 - 007730
YZ 250 A SERIAL # 431-000101 - 004104
YZ 360 A SERIAL # 432-000101 - 000631

1975 YZ B

YZ 80 B SERIAL # 492-000101 - 018570
YZ 125 B SERIAL # 453-100101 - 101620
YZ 250 B SERIAL # 483-000101 - 002759
YZ 360 B SERIAL # 484-000101 - 001459

1976 YZ C

YZ 100 C SERIAL # 1J4-000101 - 003470
YZ 125 C SERIAL # 537-000101 - 014044
YZ 125 X SERIAL # 1G8-000101 - 007120
YZ 175 C SERIAL # 1L8-000101 - 001610
YZ 250 C SERIAL # 509-100101 - 103405
YZ 400 C SERIAL # 510-100101 - 102838

1977 YZ D

YZ 100 D SERIAL # 1J4-000101 - 103550
YZ 125 D SERIAL # 1W1-000101 - 015610
YZ 250 D SERIAL # 1W3-000101 - 006520
YZ 400 D SERIAL # 1W4-000101 - 006720

1978 YZ E

YZ 100 E SERIAL # 2K5-000101 - 006572
YZ 125 E SERIAL # 2K6-000101 - 015080
YZ 250 E SERIAL # 2K7-000101 - 009850
YZ 400 E SERIAL # 2K8-000101 - 007406

1979 YZ F

YZ 100 F SERIAL # 2W5-000101 - N/A
YZ 125 F SERIAL # 2X3-000101 - N/A
YZ 250 F SERIAL # 2X4-000101 - N/A
YZ 400 F SERIAL # 2X5-000101 - N/A

1980 YZ G

YZ 100 G SERIAL # 3R2-000101 - ON
YZ 125 G SERIAL # 3R3-000101 - ON
YZ 250 G SERIAL # 3R4-000101 - ON
YZ 465 G SERIAL # 3R5-000101 - ON

Start rebuild 1993. LH-RH views.

 

Running in 1977

 

 

Seat 1977 yz 125 D Part No 1W1-24771-00 & 2K6

RESTORATION

The restoration of this YZ is well over due.
We will keep a record of this as it may be of use to others.
This bike has some History in Australia.
Has won Australian title.(riden by Scott Wilson)
Has been riden by Wayne Gardner in 1977 or 1978 at lithgow NSW Australia.
Was raced all its life, up untill its race retirement in 1979.
Ran on methonol fuel to improve performance.
Also had extensive port work and different exaust pipe.
Was perchased new from Kevin cass Yamaha in wollongong nsw Australia. Price $999,00 october 1976.