I own a like 125 but the case aint the same. Generally you have two bolts. One to fill and one to empty. Your pic is way to small but is easy. Bolts are 13mm if i recall.. the rest where 8mm. Just look at the end for those 2.
Im my case it will require 180ml of oil. I used a syringe to mesure and pour it inside.
You have a leak... id clean the area and wait to see from where it comes from.
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Hey guys it is the right one. The black bolt on the side is the drain bolt and the filler is above it.
Hopefully this will come through.
The picture is slightly different Jim to my one as mentioned already, the drain bolt is on the side (black stain) and not beneath it?
I finally found a proper manual for 125, 2006:
https://vachiraphuaklek.wordpress.com/2013/12/11/changing-your-scooter-gear-oil/I have already changed the engine oil and am waiting for my Syringe to be delivered. Had to buy it on ebay, I can't buy or find a syringe at the local stores.
Cool, I am set then changing the transmission should be a piece of cake.
Lastly, do you have any tips on removing stain oil or do I use hot water and rag?