'76 YZ100, 125

wfoyz250
Profile picture for user wfoyz250
Posts
410
Joined
1/19/2011
Location
Spring, TX US
wfoyz250
Edited Date/Time 4/4/2012 6:26pm
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?
|
Mini Elsinore
Profile picture for user Mini Elsinore
Posts
1968
Joined
8/17/2006
Location
Huntington Beach, CA US
Mini Elsinore 1/26/2012 12:41pm
1/26/2012 12:41pm
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.
Zeke27G
Profile picture for user Zeke27G
Posts
1237
Joined
11/8/2011
Location
Ascot Park, CA US
Zeke27G 1/26/2012 1:11pm
1/26/2012 1:11pm
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!!
wfoyz250
Profile picture for user wfoyz250
Posts
410
Joined
1/19/2011
Location
Spring, TX US
wfoyz250 1/26/2012 5:29pm
1/26/2012 5:29pm Edited Date/Time 1/26/2012 5:59pm
this is what it looked like before the complete tear down.



a pic of it under reconstruction.

EastFlorida
Profile picture for user EastFlorida
Posts
2334
Joined
7/31/2010
Location
Merritt Island, FL US
EastFlorida 1/27/2012 5:25am
1/27/2012 5:25am
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...

The Shop

See All »
newmann
Profile picture for user newmann
Posts
24444
Joined
4/1/2008
Location
US
newmann 1/27/2012 5:59am
1/27/2012 5:59am
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.
wfoyz250
Profile picture for user wfoyz250
Posts
410
Joined
1/19/2011
Location
Spring, TX US
wfoyz250 1/27/2012 7:24am
1/27/2012 7:24am
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?
tmphotoart
Profile picture for user tmphotoart
Posts
672
Joined
11/2/2011
Location
Yorba Linda, CA US
Fantasy
1144th
tmphotoart 2/1/2012 9:22am
2/1/2012 9:22am
wfoyz250 wrote:
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...
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?
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 . . .
wfoyz250
Profile picture for user wfoyz250
Posts
410
Joined
1/19/2011
Location
Spring, TX US
wfoyz250 2/3/2012 5:15am
2/3/2012 5:15am
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?
wfoyz250
Profile picture for user wfoyz250
Posts
410
Joined
1/19/2011
Location
Spring, TX US
wfoyz250 3/29/2012 12:14pm
3/29/2012 12:14pm Edited Date/Time 3/29/2012 12:16pm
Hey guys!!.......it's been awhile since my last post. Thought I would show a few photos of the finished project.




Parris
Profile picture for user Parris
Posts
217
Joined
1/22/2010
Location
Mauldin, SC US
Parris 3/29/2012 9:00pm
3/29/2012 9:00pm Edited Date/Time 4/1/2012 11:43am
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???
wfoyz250
Profile picture for user wfoyz250
Posts
410
Joined
1/19/2011
Location
Spring, TX US
wfoyz250 3/30/2012 5:40am
3/30/2012 5:40am
for those wondering.......stock pipe with a slightly tweaked silencer from a 2005 KX125 .
Matt Fisher
Profile picture for user Matt Fisher
Posts
3948
Joined
4/1/2008
Location
Visalia, CA US
Fantasy
1117th
Matt Fisher 3/31/2012 7:04am
3/31/2012 7:04am
Very cool rebuild, though the ripped seat cover is certainly out out of place there.
How well does it run?
wfoyz250
Profile picture for user wfoyz250
Posts
410
Joined
1/19/2011
Location
Spring, TX US
wfoyz250 3/31/2012 8:27am
3/31/2012 8:27am Edited Date/Time 3/31/2012 8:28am
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.
Mini Elsinore
Profile picture for user Mini Elsinore
Posts
1968
Joined
8/17/2006
Location
Huntington Beach, CA US
Mini Elsinore 3/31/2012 10:18am
3/31/2012 10:18am
Nice racer. Hit Humyman up for some "Humble" stickers for the tank in lieu of those "Uni" stickies and you're done!
speedbump49 1/27/2017 9:36pm
1/27/2017 9:36pm
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.
752dad
Profile picture for user 752dad
Posts
601
Joined
11/24/2014
Location
Hartland, MI US
752dad 1/29/2017 4:41pm
1/29/2017 4:41pm
Loooong time ago


Post a reply to: '76 YZ100, 125