1973 on eBay:

[firstturn]

Victor,
  You didn't offend me since we are all Friends.  I enjoy this site.

Ron Carbaugh

[Paul Danik]

What does the "GS" prepared/manufactured machine mean ?

Victor,

   Here is my observation on the GS and Special KTM Tuning question.  

   The Pentons as they came out of the box were designed more towards enduros, or as it is also known, "Geländesport", hence the term GS, instead of MX for moto cross.

On page 103 of the KTM book written by Friedrich Ehn, there is a picture taken inside the KTM factory that shows many Sachs engines with their top ends off of them, KTM did some work on the Sachs top end components to better tune the engines towards GS, or enduro work, not MX work.  I have inquired to anyone who might know, just what exactly did KTM do, but I have never gotten an exact answer.  Just that the engines were tuned for GS, not MX work, and I sure don't need to tell you there is quite a bit of difference in an engine purpose built for MX verses enduros. Nothing like twisting up a little Sachs MX grenade to put a smile on the face.


 I have Sachs engines with "Special KTM Tuning" decals on them from the KTM factory, and have seen the GS Tuned decals on fuel tanks and engines, and from what I have observed and read, rightfully so.

Paul  

[Steve Minor]

Very interesting.
Maybe Doug W. can shine some light.....

Steve Minor
Wilmington, NC

[Dave Mitchell]

Victor,I took no offense.And what I said about the rising sun bikes I meant.Back in the day I also was living in Ohio and wrenching on Pentons,well primarily on Sachs engines and I must admit I eventually wandered,but I came back.Although to this day my primary practice bike runs on Saki.
Dave

[gooddirt]

New spin; as I heard the Sachs factory had a GS motor for MX as did the Monark factory ( GS Factory PRO )  stuffed  cases internal motoplat  and  rad porting []. LG

[socalmx]

Two cents worth on the GS topic. I purchased a Monark top end to run on one of my bikes. It was the GS version which means it ran a bigger carb (spigot is larger), different porting, and runs a different piston. Go to the Monark website for the GS porting spec, etc.