Yamaha Shocks 80-81

apmmm9
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apmmm9
Edited Date/Time 1/26/2012 8:16pm
Hi Iam looking for shock info on mono shocks. I lost all of my notes form back in the day. Iam restoring a 1981 yz 125. Looking for oil wt ,oil volume and nitrogen pressure. Still have all of the tools no notes. Thanks Mark
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newmann
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newmann 10/7/2009 4:04pm
10/7/2009 4:04pm
Oh, and post up a pic of the project. Here's my 81 250 with a Fox rear shock on it.

CamP
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CamP 10/7/2009 6:09pm
10/7/2009 6:09pm
newmann wrote:
Oh, and post up a pic of the project. Here's my 81 250 with a Fox rear shock on it. [img]http://i609.photobucket.com/albums/tt171/duc-man97/DSC06803.jpg[/img]
Oh, and post up a pic of the project. Here's my 81 250 with a Fox rear shock on it.

That would be my bike of choice for GPII. Sweet bike Joe.

The Shop

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newmann
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newmann 10/7/2009 7:35pm
10/7/2009 7:35pm
Not sure what to say about the 81 YZ250. It handles well, but the midrange only motor feels pretty damn dismal. I have another engine I'm putting together but need some tranny gears for it.
CamP
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CamP 10/7/2009 8:06pm
10/7/2009 8:06pm
newmann wrote:
Not sure what to say about the 81 YZ250. It handles well, but the midrange only motor feels pretty damn dismal. I have another engine I'm...
Not sure what to say about the 81 YZ250. It handles well, but the midrange only motor feels pretty damn dismal. I have another engine I'm putting together but need some tranny gears for it.
Didn't Yamaha have a tech bulletin with porting specs for that bike? It seems like I saw them for it back when I was racing a 1981 YZ125.
project racer 10/8/2009 1:19am
10/8/2009 1:19am
I had a new 1980 YZ250G . Not a lot down low, but strong from the mid to top. It munched the gear box after only 4 months from new. They mellowed the 250 and 465 out just a little too much in '81, IMO.
mx-frog
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mx-frog 10/8/2009 2:49pm
10/8/2009 2:49pm
Works Performance just started making mono-shocks for old YZ's 1977-81,I sure way better then any old revalved or aftermarket shocks from the day and cheaper when you figure rebuild and springs!
captmoto
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captmoto 10/10/2009 12:56pm
10/10/2009 12:56pm Edited Date/Time 10/10/2009 12:56pm
mx-frog wrote:
Works Performance just started making mono-shocks for old YZ's 1977-81,I sure way better then any old revalved or aftermarket shocks from the day and cheaper when...
Works Performance just started making mono-shocks for old YZ's 1977-81,I sure way better then any old revalved or aftermarket shocks from the day and cheaper when you figure rebuild and springs!
It sounds like he has a handle on doing the work, just needs tech info.

APMMM9 - call Race Tech, they did a rebuild on my shock so they have parts and know how. Also check their website for the shock they built for my 465.

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