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As you repair your engine, I would also give a good look to the carburetors, especially the four by-pass holes. This holes are different in diameter and I found them also clogged when I bought my 710M - when these holes are clogged for instance on one carb the engine is running poor on idle and some...

I just found some pages of a maintenance booklet from Steyr-Puch for the 710M and 710K - it says therein for all gears, including steering gear: Mil-L-2105; It says MIL-L-2105 - without any additional letter like A, B or D. Thats why I use GL-4. I know that there are oils, covering GL4 and GL5, but ...

I am very suspicious on gear oil specification "GL-5" as this type of oil is very corrosive, I have filled in throuug all of the gears GL-4. In the Austrian and also in the Swiss Drivers Manual it does not specify GL-4 or GL-5. In the Austrian Manual it says "Gear Oil Pz-90" (wha...