Hi there Ty
Just a few tips;- 50:1 petrol mix is miles to much and 80:1 is not enough. You need run it at 65:1 that is 15ml of oil to 1 litre of petrol, that is the correct mix. Don't use Silkolene oil in your petrol as it is not good for the bikes and will gunk everything up like yours rings etc !!!
Gearbox oil, although it says 550ml in the hand book that is wrong you need to put 400ml in. If you put 550ml in it will just force it out of the over flow pipe. The best oil to use is the Atf fluid then you should'nt have any problems with your clutch dragging, if not any good light gear oil.
Hope this helps you Skywalker.