Messages

1

Yamaha / Re: YZ125A Suspension Upgrades

« on: June 23, 2017, 10:10:49 am »

I'm running 13" shocks. Next year I'm going to switch to 13.5". I raced at Unadilla a few weeks ago and it was nice not bottoming out the front end over every jump.

2

Yamaha / Re: YZ125A Suspension Upgrades

« on: May 08, 2017, 09:27:17 am »

It's taken me until today to get the new forks and wheel completed and installed. I hope the expense and bullshit I've had to deal with will have been worth it. I think I'm going to find some foam and zip tie it on the lowers to add some level of protection. The lowers are awfully thin.
Next year I think I'll upgrade the shocks.

3

Wanted / Re: Noguchi Mikuni 29mm

« on: March 03, 2017, 01:59:12 pm »

I'll look into that. Thanks for the information.

4

Wanted / NOS Yokohama 3.50/18 Y612 & NOS Dunlop Sports 2.75/21

« on: March 02, 2017, 01:58:35 am »

If you have either tire and are willing to sell please let me know. Thanks

5

Wanted / Noguchi Mikuni 29mm

« on: March 02, 2017, 01:56:31 am »

Hello, The 175cc Noguchi kits came with a small body 29mm Mikuni. If you have one to sell please let me know. Thanks.

6

Yamaha / Re: yz125a

« on: March 02, 2017, 01:53:03 am »

7

Yamaha / Re: YZ125A Suspension Upgrades

« on: January 12, 2017, 01:37:41 pm »

I'm running a Shinobi water cooled head on my bike.

8

Yamaha / Re: YZ125A Suspension Upgrades

« on: January 12, 2017, 12:46:29 pm »

I'm making progress. I picked up a rim off ebay. I've taken apart a complete mudcatcher wheel, and am going to use the spokes and hub. Today I sandblasted and painted the triples and the hub. I'm halfway done polishing the spokes. The rim had a lot of imperfections but no cracks or flat spots. I sanded it starting with 220 grit and finishing with 800. Then I polished it with mag wheel polish. It came out pretty good. Not show quality, but it doesn't need to be for a race bike.

9

Yamaha / Re: YZ125A Suspension Upgrades

« on: January 03, 2017, 08:41:12 am »

The stock forks are 30mm. In my opinion they are a poor excuse for motocross forks and are not worth any attempt at an enhancement. I think these forks that I'm building will be a major improvement. Time will tell.

10

Yamaha / YZ125A Suspension Upgrades

« on: January 03, 2017, 04:40:23 am »

After six years of procrastinating I'm finally going to upgrade my suspension. I bought a set of forks off of a YZ250A. They were in rough shape. I have the tubes back after getting them straightened and re-chromed. I've sanded the lowers and have them just about ready for clearcoat. I ordered new Race Tech springs that should arrive this week. I picked up a set of 1975 triples. They will work better for mounting my radiator versus using parts from a 1974. I'm currently coming up with a plan for a front wheel. I'll share some pictures as I make progress. Happy New Year!

11

General Discussion / Re: Announcing the inaugural OzVMX Resto Expo - March 11/12, 2017

« on: December 05, 2016, 09:29:03 am »

This sounds like a very cool event. Wish I could go.

12

Yamaha / Re: YZ125 Updates

« on: July 27, 2016, 10:07:05 am »

Please do. I'd like to see the article. Thanks.

13

Yamaha / Re: YZ125 Updates

« on: July 26, 2016, 11:12:19 am »

It took me about a year but I found a Shinobi Radiator. I believe it used to belong to the late team Noguchi/Shinobi rider Dennis Hall. He ran #254 back in the day. The radiator is way heavier than the one I already installed, so I'm not real motivated to get it mounted up. Someday.

A few months ago I made a replacement plate for my airbox. The original Yamaha design sucks. Now I can run a Uni Pod filter. It works way better than stock. I recommend this if you have a bike with this airbox. I spun some laps with the bike on the Southwick national track last week. The bike goes real well.

14

Yamaha / Re: YZ125 Updates

« on: April 27, 2016, 09:25:37 am »

Humble Yamaha was located in Texas. They had  MX, Trials, Flat Track, and Road Race teams. They would do a lot of experimenting with their engine combinations. This included running the earlier model 5speed bottom ends on the 1976 YZ125 and YZ175 models. The 439 was raced by Glenn Urquart.

15

Yamaha / Re: YZ125 Updates

« on: April 25, 2016, 11:23:19 am »

From all I've read the Noguchi kitted bikes were super fast right up until they seized. Apparently the chrome bores failed quickly. At some point in the history of my cylinder it was sleeved. I had it bored to 2nd over, no chrome issues for me. As far as the Shinobi set ups, it doesn't seem like they caught on. Possibly the thermo-siphon operation didn't work well. Here are a few vintage pictures I've located of Shinobi equipped YZ125's and an ad from Shinobi.