70s yz 125

oldschoolmxr203
Edited Date/Time 1/27/2012 4:44pm

broc glovers factory yz 125. taken @ st. pete., fla mx nationals 77/78
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BVS40FL
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BVS40FL 1/18/2010 3:03pm
1/18/2010 3:03pm
I'm gonna guess 78'
Because my 79' came with the number plates far back like that.
They usually incorporated the trick stuff from the factory bikes
the following year on the production bike.
If that shot is from St. Pete. I'm sure I was drooling over the
bike at some point during the day.
Wandell
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Wandell 1/18/2010 7:34pm
1/18/2010 7:34pm Edited Date/Time 1/18/2010 7:34pm
I think it's a 79. I believe the 78 works bikes still used the small side panels with the numbers near the center of the bike near the airbox.
mxvet37
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mxvet37 1/18/2010 11:21pm
1/18/2010 11:21pm
I always liked the way Yamaha factory bikes extended the graphics around the entire gas tank in the front. I have some pics of Broc's 1980 works YZ125 from the pits in Saddleback during the national. Need to get a scanner and get those bad boys posted...
project racer 1/18/2010 11:32pm
1/18/2010 11:32pm Edited Date/Time 1/18/2010 11:37pm
Wandell wrote:
I think it's a 79. I believe the 78 works bikes still used the small side panels with the numbers near the center of the bike...
I think it's a 79. I believe the 78 works bikes still used the small side panels with the numbers near the center of the bike near the airbox.
+1. I forget the model designation for the '79. OW , for sure. But what number?

The Shop

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vetarider
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vetarider 1/19/2010 11:42am
1/19/2010 11:42am
Nice looking bikes back then.

Is that bike air cooled? The picture is kind of small and it's hard to tell. Can you re-scan or re-post in a larger size?

TFS has pics on his website of Glover's bike from St. Pete between 78-79 and that bike is water cooled. It also has the side number plates extended back like the one in the picture above.
project racer 1/19/2010 11:51am
1/19/2010 11:51am
vetarider wrote:
Nice looking bikes back then. Is that bike air cooled? The picture is kind of small and it's hard to tell. Can you re-scan or re-post...
Nice looking bikes back then.

Is that bike air cooled? The picture is kind of small and it's hard to tell. Can you re-scan or re-post in a larger size?

TFS has pics on his website of Glover's bike from St. Pete between 78-79 and that bike is water cooled. It also has the side number plates extended back like the one in the picture above.
Not the same bike. Those pictures on Racetime are from 1980.
BVS40FL
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BVS40FL 1/19/2010 1:12pm
1/19/2010 1:12pm
Which also makes sense , because if the factory bike was water cooled in '80
then the H model '81 was a water cooled production bike.
I think that '81 model was my favorite 125 .
project racer 1/19/2010 4:42pm
1/19/2010 4:42pm
I have to believe that we would have seen a production water cooled 125 Yamaha way before 1981 had it not been for the claiming of the factory '76 OW27 at Red Bud that year.

$2500 would have been a hell of a deal for a works OW27 if Mickey Boone had been successful, even in '76 dollars. I wonder what the appraised value of that bike is today, now that Terry Good has revived it to it's former glory?

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tomcat1 2/9/2010 7:26pm
2/9/2010 7:26pm
is that the yamaha with the rotory valve motor. that thing was a rocket. i wonder why yamaha never made the rotory engine for production
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Wandell 2/9/2010 8:11pm
2/9/2010 8:11pm
No. It was the 1983 OW125 works bike that had the rotary valved engine. Ron Lechien rode one in the 83 Nationals and Jim Gibson and Jacky Vimond rode them in the GP's.











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Wandell 2/9/2010 8:12pm
2/9/2010 8:12pm
Closeup of the rotary valved engine.


newmann
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newmann 2/9/2010 9:54pm
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The early OW's used block off plates on the waterpump housing and air cooled top ends to avoid getting claimed. They could switch to the watercooled setup as necessary. Pretty complex cooling system routing its way through the frame, steering head and triple clamps on its way to the radiator. Can't actually believe Yamaha would sell something that "works" to the general public. Hot water through the steering head? Melted grease, dried out seals, leaks and seizures were sure to follow. Lots of maintenance required on those.
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MOgle80 2/9/2010 10:16pm
2/9/2010 10:16pm
Hot water through the steering head? I have heard that front suspension heated up too much also from that radiator position.
GIwasB4
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GIwasB4 2/9/2010 10:20pm
2/9/2010 10:20pm
Moto's only lasted 15 minutes plus a lap then, stock suspension and cooling was not the issue.
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GIwasB4 2/9/2010 10:51pm
2/9/2010 10:51pm
GIwasB4 wrote:
Moto's only lasted 15 minutes plus a lap then, stock suspension and cooling was not the issue.
Now moto's are only 4 laps plus 1.
deathgrip
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deathgrip 2/10/2010 11:34am
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newmann wrote:
The early OW's used block off plates on the waterpump housing and air cooled top ends to avoid getting claimed. They could switch to the watercooled...
The early OW's used block off plates on the waterpump housing and air cooled top ends to avoid getting claimed. They could switch to the watercooled setup as necessary. Pretty complex cooling system routing its way through the frame, steering head and triple clamps on its way to the radiator. Can't actually believe Yamaha would sell something that "works" to the general public. Hot water through the steering head? Melted grease, dried out seals, leaks and seizures were sure to follow. Lots of maintenance required on those.
I have seen many posts from you but yet to find a positive one. Yamaha brought new technology to the market place and you find fault it that? So what if the bearing needed to be lubed often. Please open your eyes to the amazing advancement Yamaha put forward in the early 80's.
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newmann 2/10/2010 7:36pm
2/10/2010 7:36pm
newmann wrote:
The early OW's used block off plates on the waterpump housing and air cooled top ends to avoid getting claimed. They could switch to the watercooled...
The early OW's used block off plates on the waterpump housing and air cooled top ends to avoid getting claimed. They could switch to the watercooled setup as necessary. Pretty complex cooling system routing its way through the frame, steering head and triple clamps on its way to the radiator. Can't actually believe Yamaha would sell something that "works" to the general public. Hot water through the steering head? Melted grease, dried out seals, leaks and seizures were sure to follow. Lots of maintenance required on those.
deathgrip wrote:
I have seen many posts from you but yet to find a positive one. Yamaha brought new technology to the market place and you find fault...
I have seen many posts from you but yet to find a positive one. Yamaha brought new technology to the market place and you find fault it that? So what if the bearing needed to be lubed often. Please open your eyes to the amazing advancement Yamaha put forward in the early 80's.
Once again, you join today and am already stalking me? Dude, you have no clue. Go back to the works bike thread in the moto section for a little more OW 27 info. Bevo used to wrench on them back then. Said it was a whole lot of work keeping those things up back then. How many people who buy bikes tear down and regrease their steering heads on a regular basis? I keep my bikes up meticulously and can guarantee that steering heads get done very seldom. On a production level, they had a lot of meltdowns. I've resurrected a few 81 YZ125's out of the boneyards and they all suffered death by seizure and had rusted up steering heads. It was a bad design and pointed out by most all the magazines. I just pointed out the issues with the design and the extra worked involved to keep it working. How the hell do you come up with "me" finding fault with it? I embrace the works bikes, but after all these years of lightweight tricked out stuff I just can't get behind the weight of the modern open class bikes, four strokes or not. Going backwards as far as I'm concerned. As far as early 80's amazing advancements, you'd be hard pressed to get Hannah to agree with you on that one. If you are looking for amazing back then, search no further than the Honda pits. Now that was some amazing stuff.
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newmann 2/10/2010 7:55pm
2/10/2010 7:55pm
From the other thread, I uploaded some of my OW pics to photobucket today to post here today. Now that the newbie has been dealt with , here are some photos of my 77 OW27, Gerard Rond's GP bike from Europe done up in U.S. colors. I have the white bodywork as well.


Plumbing goes through the frame into the steering head which is separated into an upper and lower chamber. Steering stem has holes in it allowing coolant to pass through and out to the radiator which is mounted way up high on the triple clamps. Way ahead of its time back then.


Cylinder and head had fins as well as water passages. The water pump had a removeable outlet plate that could be replaced with a block off plate when they ran the air cooled top end.


Alloy tank and hand built frames and swingarms. This one actually has a 78 OW arm on it as it was built out of an incomplete bke to begin with. Works parts aren't too easy to come by so if anyone has a spare 77 OW27 swingarm and front forks, I will pay dearly for them.


Rear shock isn't correct for 77 either but considering it was one of Tilkins personal prototype projects, I think I'll keep it on the bike. Probably one of the trickest shocks of the time.


Glover saw it in the Houston pits a few years back and stopped and talke for the better part of an hour. Very cool indeed, got some good info and stories!


Not to mention, Glover knew how to get the most out of one of these things.

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observer
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observer 3/11/2010 6:09pm
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"Now that the newbie has been dealt with..." Laughing Man...that is T-rick Newmann....been a while, but everytime I walk up to the "golden era" bikes(last time was at Rreliant Stadium in Houston), I grow a pup tent in my fly area on my pants! Just fricken awesome! Woohoo
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observer 3/11/2010 6:09pm
3/11/2010 6:09pm Edited Date/Time 3/16/2010 12:28am
observer
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observer 3/11/2010 6:20pm
3/11/2010 6:20pm
Sorry for double post. No idea...
Bill163
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Bill163 3/11/2010 9:25pm
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Joe while the OW has the euro spec Tilkins shock it has the US spec reservoir still in the bottom of the frame down tube held in with a circlip but I bet you know that.Wink
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ThePipe 3/13/2010 5:19am
3/13/2010 5:19am Edited Date/Time 4/17/2016 9:22pm
tomcat1
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tomcat1 4/5/2010 2:51pm
4/5/2010 2:51pm
ok i do beleive on the early ow 125 yamaha water cooled bikes that the heat from the water hose would melt the steering head grease. if anyone has owned a water cooled bike you know those hoses get mighty hot , so i agree its a bad design. but it looks like on the 83 ow 125 yamaha figuered that out. and if i remember , the word was no other 125 came close to it as far as power. i just cant help but think with todays technology a rotoy vavled and power vavled water cooled motor just might be the ticket . and oh yes both of those ow 125s are the shit.
oldschoolmxr203 4/22/2010 6:16pm
4/22/2010 6:16pm
I finally figured , out the Mrs.., scanner so im re posting the pic along with another,,, ., ,
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Wandell 4/22/2010 7:41pm
4/22/2010 7:41pm
Sweet! The top bike is Glover's 79 works bike, right?
oldschoolmxr203 4/23/2010 12:21pm
4/23/2010 12:21pm
Wandell wrote:
Sweet! The top bike is Glover's 79 works bike, right?
Yes its Glovers , factory Yamaha, the bottom pic, with the LOP bike is the production version of the same yr bike?
it had simons forks, and some kind of rear suspension resevoir, attached to the swingarm,,
project racer 4/23/2010 12:45pm
4/23/2010 12:45pm
I believe that is David Taylor's #11 LOP '79 YZ125F in your pic, oldschool.
oldschoolmxr203 4/23/2010 3:56pm
4/23/2010 3:56pm
project racer wrote:
I believe that is David Taylor's #11 LOP '79 YZ125F in your pic, oldschool.
Thanks project,,
Between you , wandell,, bill163, and newman, you guys really know your stuff, about bikes from the mid to later 70s and early 80s,,

i was thinking maybe it was Jeff Surwall, because of the LOP ,,, Il. conn., any ways it was 4-5 yrs before Surwall, ,,

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