How much and what kind of oil should i use for this particular model. it does not have a dipstick but a window towards the bottom of the case. how do i know im low?

1st off the site glass window u see should have the oil level 1/2 way up the glass a max of 3/4, the oil that is recommended for this bike is 10W-40W, u can use conventional (any name brand, Castrol and Valvoline are what I trust)) oil but synthetic is highly recommended as it greatly extends the life of the engine, change oil and filter every 2-3,000 miles, if u store the bike over the winter make sure to change the oil before u store it, oil gets many corrosive chemicals (from normal combustion blowby) after a very short time, they can damage the bearings if you leave them in the engine over winter storage. I have ridden *** bikes for 35 years and this is what i base my recommendations on as well as factory maintenance books..

Hi there

See here the Article about the
Yamaha XJ700X Maxim& HERE & HERE