Oil change and gear oil question

[kram6319]

I am going to attempt to change my oil and transmission fluid myself

I wanted to ask what is recommended for engine oil and gear oil for the transmission??

I did find 85-140 gear oil and wonder if I can use that? My scooter has 700 mi on it and I already had the gear oil and motor oil changed once at 317 miles. It is so cheap to change the oil and gear oil I feel it's worth doing every 800 mi or so. I plan on waiting until I get close to 1000 mi to change the gear and motor oil.

What do you recommend??