YZ 125 A WHEELS

[albrid-3]

WOULD LIKE TO BUY YZ 125 A FRONT WHEEL AND REAR, COULD ANYBODY TELL ME, DID YAMAHA USE THE SAME HUBS AND RIMS ON OTHER MODELS, FOR EXAMPLE YZ C, X MODELS.
THANK YOU DAVID

[jimg1au]

use this web page and find out yourself
http://www.yamaha-motor.com/sport/parts/home.aspx
cheers

[albrid-3]

THAT WEB-SITE TELLS ME JACK-SH---T, I AM TALKING PRE 75

[DJRacing]

With all due respect albrid-3, that website will tell you everything. Jimg1au is right, if you cant figure out if a wheel from a YZ-C or X will be the same from the parts catalog, then maybe you have a problem?
The parts catalog goes back to 1963, and covers all models of yamaha's so pre75 is there.

[albrid-3]

Well l subscribed to it , found history of yamaha and that is it.

[cyclegod]

MX125A/B use the same hubs front and rear.

[albrid-3]

Well thank you cyclegod, all it takes is a little help from a person who cares and has sometime to answer one question., I am trying to build a bike for my son to race at the nationals, and l am chasing parts.
quote, if you can`t help me out with some rusty old Yamaha parts, well then keep the remarks to yourself.

[jimg1au]

and knows how to use a computer not like OTHERS

[mainline]

if you go to the link above that Jim posted, and click on the "parts catalog" button on the lower right hand side of the page and then select "motorcycle" at the top of the page it will take you to the full Yamaha parts catalog(ue)   as DJ said, all the way back to 1963.

It's a must have site if you're doing a resto/rebuild on a Yamaha.



p.s. Cyclegod doesn't care about anyone he does have too much spare time though

[E74]

The Yamaha site goes all the way back to 1963, you must be pretty computer savy the way you figgured that one, and yes I do have a pair of those wheels, the front has a NOS rim on it 

[albrid-3]

Thank you for explaining.It makes sence when it is shown. Are your YZ 125 A wheel E74 FOR SALE.

[albrid-3]

THANKS JIMGIAU, FOR THE WEB SITE, CHECKED IT ALL OUT, AND THANKS E74 FOR EXPLAINING.

[Nathan S]

The front hub is shared with AT1 and most YZ100s. 248 prefix.
The YZ100s have an externally lipped alloy rim, which is nice, and seems less crack-prone than the lipless DID of the larger YZs.

The rear hub is the same as MX125A/B and very similar to YZ125C. The difference is that the C hub has larger (10mm) studs holding the sprocket on, compared to the earlier bikes' 8mm bolts.

The YZ125X hub has the larger studs, and a slightly different mounting position for the rear sprocket (the sprocket is a few millimetres further away from the spokes). This allows you to run a flat (un-dished) sprocket from a later YZ/DT which are a lot easier and cheaper to buy.
The YZ125D/E/F and monoshock DT125/175 hub is also very similar - its mounts the rear sprocket another few millimetres further out-board of the spokes. Some time in the lathe will trim it back to the specs of the YZ125X hub. (Trainspotters Tip: The later hubs still have the YZ125X's 1G8 prefix cast into them, down in one of the recesses between the studs - a modified YZ-E/DT mono hub is therefore impossible to distinguish from a genuine YZ-X hub).

I think that I posted these pics up just the other night, but this time I'll add captions:

This is a DT125A with an unmodified YZ125E rear wheel in it. As it sits, the front and rear sprockets line up, but obviously the wheel is way too far to the right.


Same bike, exact same wheel, now sitting with the rim reasonably centred in the swing-arm. The sprocket holding studs are toucihng the swing arm, and (obviously) the sprockets don't line up anymore.


The solution:

FWIW, the distance between the sprocket mounting face and the inside of the spoke flange in 26mm for a YZ125X hub (actually, if you're going to start chopping into a hub, let me check that measurement first!).

Following the strict letter of the law, any of these hubs fitted to a pre-75 bike is illegal. I doubt that anyone would care.

[Nathan S]

Oh, and to actually reply to the question asked....

I have a complete YZ100F front wheel. Clean wheel with shiny spokes.

I also have heaps of YZ125D+ style rear hubs, and a YZ125C rear hub. The C hub has pulled the threads out, so would need the holes welded up and redrilled. It's probably more work than a good hub is worth, but you could also take the holes back to 8mm at the same time.

[albrid-3]

Nathan, thank you for all that information.
david