Messages

181

Yamaha / Re: YZ125E Swingarm Bushes

« on: April 26, 2011, 06:58:24 PM »

Hi Slawesy

The bearings and bushes are still available yamaha but only one side sleeve is still listed (same as 250/400 which uses the same size on both sides). They use a bearing on the out side and a plain nylon bush on the inside. All up the bits that are still available will be $100+

I have not done this but will next time I will, buy the All Balls swing arm kit ($150) for a 250/400E and shorten one sleeze.

You could use all four bearings instead of the nylon bushes on the inside for better control.

Just a thought!

Peter B

182

Spaniards (Bultaco, Ossa, Montesa etc) / Re: VR250 Complete

« on: April 20, 2011, 10:42:31 PM »

Very nice Greg.
Don't mess it up to much in Victoria, it will need to be that nice at the CRC!

Have a great time down south.

Peter B

183

Wanted / YZ250D / 400D Swing Arm Needed

« on: March 24, 2011, 08:49:32 PM »

Hi All

Looking for swing arm for a YZ400D project. Have one but the bearings had seized and the arm became the pivot point flogging it out. I've seen them in the States but just seeing if there is one locally before going off shore.

Peter B
0418 680 264

184

British (BSA, Greeves, Triumph etc) / Goldy and 74 CCM

« on: March 22, 2011, 10:45:40 PM »

Hi All

If anyone is interested there are some interesting motorcycles hidden away here at the moment.

Check the BSA section out......................

http://www.classicstyle.com.au/

Peter B

185

For Sale / Re: PE175 & YZ250E Wrecking for parts

« on: March 01, 2011, 09:27:42 PM »

Hi Brett

After a kick starter,  exhaust and muffler for the YZ. What are my chances?

Peter B

186

Wanted / Re: YZ 400E tank, YZ 125K motor

« on: February 23, 2011, 04:38:43 PM »

Steveo

The YZ250D and E tanks and the YZ400D tanks are all the same. Spead the net wider.

Peter B

187

General Discussion / Re: Classic Dirt 8

« on: February 21, 2011, 04:37:12 PM »

Is Twist and Shout in the Jump Seat again?

I'm keen to ride his XT250!

Peter B

188

Honda / Re: XR500 Reed Valve

« on: February 20, 2011, 10:47:23 PM »

The reed valve was to allow bigger overlap on the intake cam lobs. The will run OK for MX without them but loose a bit down the bottom end.
Back in 81 we hotted up a XL500. Big cam bigger carby and porting. Suffered very poorly off the bottom. The cam we used was about 2 degrees (from memory) more than the XR's but they had a very responsive bottom end.

It's all about keeping the fuel going the right direction all the time.

By the way, I actually saw something very similar on a old Holden 6 in a hill climb car. With a very radical cam and no reed valves (on triple carbs) the thing would not pull low down (lots of spluttering back through the carbs). With the reed blocks just under the carbs the thing idled and screamed.

Peter B

189

Yamaha / Re: trainspotters whats the gear sets teeth on the YZ125A ? anyone got it handy

« on: February 03, 2011, 10:16:31 PM »

Don't known about a bunny, looks more like a pup?
Just to compare;

30T - 22T - 26t - 24T -22T and the idler 25T 

       YZ125A                    MX125A
1:     34/12                       34/12
2:     31/15          30          30/16
3:     29/18          26          26/19
4:     25/19          24          24/22
5:     24/21          22          22/23

What about the rest of the motor? Case numbers and barrel etc?
Is there anything that identifys the the rest of the motor as ZY?

Regards

Peter B

190

Yamaha / Re: trainspotters whats the gear sets teeth on the YZ125A ? anyone got it handy

« on: February 03, 2011, 09:50:41 PM »

Alright Freaky

After much digging in the shed I found the Clymer Piston Port book whick includes the YZ125A and MX125A.
So according to them;

       YZ125A                    MX125A
1:     34/12                       34/12
2:     31/15                       30/16
3:     29/18                       26/19
4:     25/19                       24/22
5:     24/21                       22/23

Primary is the same for both.

For what it's worth the AT2MX has the same ratios as the MXA. Your numbers look more like the MX set then the YZ with maybe a cog  from the YZ thrown in for good measure.

Regards
Peter B

 

191

Tech Talk / Re: xt550project

« on: January 15, 2011, 10:08:45 AM »

Noisy

There were a number of aftermarket shocks built for these YZ models. There were gas springs and all sorts of great options however, if you can find one you will pay. I've seen these unique shocks needing rebuilding for $400+ US and I cant say they would work much better, especially touring and trail riding.

There are also shock guys who can rebuild the shock with modern seal kits requiring machining and adding a remote reservoir etc. I was quoted $600 for this type of rebuild and I still may do this but without a stiffer spring (quoted $350+) I just couldn't justify it. Now I have a possible spring option I may think a bit harder over it.

Anyway, I'd first just try a service with a new bump rubber. Last one cost me about $100 in Sydney.

regards

Peter B

192

Tech Talk / Re: xt550project

« on: January 14, 2011, 11:24:28 PM »

Hi Noisy

Do you recall what numbers the shock had on it. From the sound of it, given the frame layout, it sounds like a YZ 250/400 D/E shock. The shocks are pretty ordinary but certainly respond to a freshen up and new bump stop rubber. If you do get it serviced I have found that getting the gas pressure up to the maximum seems to help.

As it happens, I've been trying to suss out a heavier spring for my YZ250E. You may have helped immensely with my problem.

Any extra 550 springs out there (even to borrow for testing?)

Regards

Peter B

193

Wanted / Re: YZ or IT 250d / 400d/e engine mount

« on: January 14, 2011, 11:02:54 PM »

Thanks Steve

It's funny when you think your ready to start the reassemble bit and there is one little thing stopping you.

Regards

Peter B

194

Wanted / YZ or IT 250d / 400d/e engine mount

« on: January 12, 2011, 11:21:31 PM »

Hi All

Looking for a 1977 YZ or IT 250/400 rear engine mount (in usable condition).

Thanks in advance

Peter B

195

Bike Talk / Re: Taller front forks for a YZ80C?

« on: January 12, 2011, 09:48:36 AM »

Just out of curosity, what diameter are the forks for the yz80? And what diameter is the axle?

Regards

Peter B