'76 YZ100, 125

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1/26/2012 12:39 PM

Any Yamaha experts know about the neutral detent bolt/spring/ball that threads into the upper case right above the shift drum?
Are these pieces supposed to be installed loose? The bolt that I removed from my bike has the spring and ball stuck in it, as if somebody "staked" the edge of the bolt-end to retain the spring and ball so it can be installed as one piece.
I've seen the exploded view on microfiche and have seen one on ebay.
Any ideas on what should be correct way to install this?

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Larry Navarro - Spring,TX. Damm glad to meetcha!

1/26/2012 12:41 PM

Joe Newmann to the red courtesy phone. Joe Newmann, please pick up the red courtesy phone..... Hold on. He'll be here in a second.

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1/26/2012 1:11 PM

wfoyz250,

Can we see some pictures of this '76 YZ100 you talk of?!

I think I see Newmann walking down the hallway right now....I'll let him know you've been on hold for awhile!!

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Do It In The Dirt!

1/26/2012 5:29 PM
Edited Date/Time: 1/26/2012 5:59 PM

this is what it looked like before the complete tear down.

[LINK TO IMAGE]

a pic of it under reconstruction.

[LINK TO IMAGE]

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Larry Navarro - Spring,TX. Damm glad to meetcha!

1/27/2012 5:25 AM

I had a 1977 YZ100 back in the day. Man, talk about a screamer! No bottom end, but when it came on the pipe, it would move! I wish I could find another one...

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2019 KTM 350 XC-F
Daytona Dirt Riders (DDR)
Floridatrailriders.org (FTR)

1/27/2012 5:59 AM

Mini Elsinore wrote:

Joe Newmann to the red courtesy phone. Joe Newmann, please pick up the red courtesy phone..... Hold on. He'll be here in a second.

Someone needs to re-ask this question in regards to a 74-78 CR125 Elsinore.....smile

I don't know too much about that bike and it has been a whole lot of years since I rebuilt a 74 YZ125 which was probably similar. Sounds like the part he is describing is not meant to be taken apart. rather installed as an assembly.

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1/27/2012 7:24 AM

Joe.......I would think that if it were to be installed as an assembly, the exploded parts diagram would have a "bracket" symbol on those particular parts and would be noted as an assembly, right?

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Larry Navarro - Spring,TX. Damm glad to meetcha!

2/1/2012 9:22 AM

Take a look at this Yamaha parts site. They have part assembly photos/diagrams for the 1976 YZ 100

http://216.168.60.165/speedandsportinc/Index.tpl

Race On . . .

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2/3/2012 5:15 AM

I would think that trying to install this assembly in the three pieces as shown in the yammer diagram, it seems there would be nothing to retain the ball as it rides on the shift drum detent.
My '79 YZ250 has a spring loaded "bullet" shaped neutral locator and it is retained inside the oil drain bolt. It has plenty of travel within the bolt to move at least 3/8", where as the yz100 has the spring loaded ball which can't be retained outside of the bolt.
Because of this design, I think the neutral locater ball, spring and bolt is installed as one assembly.

Whaddaya think?

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Larry Navarro - Spring,TX. Damm glad to meetcha!

3/29/2012 12:14 PM
Edited Date/Time: 3/29/2012 12:16 PM

Hey guys!!.......it's been awhile since my last post. Thought I would show a few photos of the finished project.

[LINK TO IMAGE]
[LINK TO IMAGE]
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Larry Navarro - Spring,TX. Damm glad to meetcha!

3/29/2012 9:00 PM
Edited Date/Time: 4/1/2012 11:43 AM

I raced in the Atlanta area in the 100cc class back then. Two of the fastest riders in the area were the #117 and the 711 both rode the YZ. Any body remember their names???

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3/30/2012 5:40 AM

for those wondering.......stock pipe with a slightly tweaked silencer from a 2005 KX125 .

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Larry Navarro - Spring,TX. Damm glad to meetcha!

3/31/2012 7:04 AM

Very cool rebuild, though the ripped seat cover is certainly out out of place there.
How well does it run?

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3/31/2012 8:27 AM
Edited Date/Time: 3/31/2012 8:28 AM

Matt........this bike is a racer so there's a few flaws as far as cosmetics go.....tank, seat, rims....even the rear tire is old. The detail's are in the suspension and engine.......this little bomb rips.
Won 100cc class last weekend at our EVO event.

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Larry Navarro - Spring,TX. Damm glad to meetcha!

3/31/2012 10:18 AM

Nice racer. Hit Humyman up for some "Humble" stickers for the tank in lieu of those "Uni" stickies and you're done!

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4/4/2012 6:26 PM

This was my 1977 YZ100

[LINK TO IMAGE]

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2019 KTM 350 XC-F
Daytona Dirt Riders (DDR)
Floridatrailriders.org (FTR)

1/27/2017 9:36 PM

I have an almost complete yz100c engine, and a basket of clutch parts, I'm not sure which clutch belongs to it. Can anyone post pics of their 1976 yz100 clutch basket, front and rear thanks.

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1/29/2017 4:41 PM

Loooong time ago
Photo

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