Messages

RD125B

yikes. nice but pricey indeed

I don't really follow YSR prices but I didn't think the price was that out of line.

It's not really. I've seen a few really nice stock 50s sell recently for almost that price

Many years ago when I was compaing parts in the garage in an attempt to find a solution for the carb issue on the small RDs I did a comparison of intake joints and found that the RD350/RD400/Banshee bolt holes lined up with the RD125/RD200. Attached is a tracing I did probably 10-12 years ago.

Also attached is pipe specs for the TA125. I'll look around in my files, I may have some other pipe designs for the 125. I contacted a lot of pipe builders (a couple guys in the UK, a guy in the Netherlands, Jon at Jemco, etc.) to inquire about making pipes for a hot-rodded RD125 or RD200.  Jon said he could make them, but I'm not sure if he's still building pipes. The guy in the Netherlands said he had a kit but it would need to be welded.

I'm curious who is manufacturing the pistons, maybe Vertex...?

That's what I thougth at first. Same MOS2 coating, but the Vertex pistons are made in Italy and these seem to be imported from Germany

[1973 Yamaha RD350 project - $3500 (Anaheim)]

(not mine)  Price is a little steep for an unfinished non-running project, but it does come with another titled frame plus the table lift and paddock stands

https://orangecounty.craigslist.org/mcy/d/anaheim-1973-yamaha-rd350-project/6821716948.html

1973 Yamaha RD350 project - $3500 (Anaheim)
1973 RD350 project bike. Includes '73 frame (with title) modified for mono shock using CBR1000 rear shock. 2005 GSXR600 front fork. 2005 GSXR 600 brakes front and rear on custom machined carriers. RD350 engine turns over but is not currently running. Bike is currently set up with magnesium race wheels, battle axe tires, Fast from the past rear sets and Wicked Motorsports chambers. Also included is a unmodified '75 RD350 frame (with title), a set of RD400 mags, RD350 spoked rear wheel, several rear swing arms (RD 350LC, RD400 and RD350), RD350 and 400 gas tanks and a sir od KZ mag wheels.

Also included is the service/bike lift and front and rear track/race stands.

Not interested in parting out at this time.
$3500 OBO

Interesting, hadn't hear of them yet. Thanks for posting.  Another parts source 

You don't see those around much. Especially with only 800mi and in nice condition. I wonder what's up with the odd number for the price?  $4609

Yamaha RD200B Service Data
Yamaha RD200C Service Data

Wow, that's beautiful John!

[EACH]

The RD125 stock carb is a 18mm TeiKei Y18P (the RD200 uses 20mm TK Y20P). They're junk!
RD125 & RD200 specs
The TA125 carb from the factory is a Mikuni VM26SC. A VM28SC was also available with the optional GYT kit.
TA125 specs
The TA uses large carbs because it was designed to run flat-out all the time, and hence has a narrow powerband up near it's 13K redline. Carbs this big would probably be overkill on a street 125cc. 

The changeover to Mikuni carbs has been done and it's something I've been planning. The TeiKei carbs are nearly impossible to work with due to the near zero availability of parts and difficulty in tuning. The last genuine jets I saw were going for $15-20 EACH and are very hard to find!

Because the TKs have the carb manifold integrated into the body you need to install angled carb joints that will allow other flange-mount carb brands to bolt up. You can use Yamaha CT2 / AT2 / DT125A/B carb joints for this. Yamaha part #314-13565-00-00. I picked up some for about $10ea a while back off Ebay for my future project. (see the attached photos). I am planning to use Mikuni VM20s

I found this write up that details the parts and process.
https://yamaha-rd125.blogspot.com/2016/12/new-mikuni-vm20-carbs-yamaha-rd125-a.html

Yamaha RD125B Service Data
Yamaha RD125C Service Data

+1 on what Cam said above ^^  Chuck is your guy.

It finally stopped raining and cleared up so I took it out on a 45mi ride on PCH today

That's a pretty legit non-2T to own   

He's a senior citizen in racing.  Compared to many of the rest of us, he's just a kid!

Ha! This is a statement!   

And still capable of winning. It's a longshot with the current bike but I'd love to see a 10th championship.

True, and I would also love to see him win #10. Yamaha needs to figure out what is holding them back.

And if he gets a 10th I'll have to get a new piece of wall memoribilia