tsh
I moved your post to the general tech section for better exposure. The self help area where you originally posted this post is mostly for questions pertaining to a post already in that section.
In regards to the oil question, your bike being an evo can use either 20/50 , 20/60 or straight 50wt or even 60 wt depending on your area temps where you ride.
The heavier weight (50-60) would be best for summer time temps and would be difficult cranking in colder climates.
As far as transmission oil, use a quality GEAR oil and not engine oil. Some suggestions would be Mobil 1, Redline, royal purple which should be available at a parts store like NAPA, autozone or similar stores. Gear oil will give you the best service as it is formulated to withstand the extreme environment of the transmission gears.
Hope this answers your questions.