What to look for
Lots of blue oil smoke means worn plated barrel liners so a rebore is not an option. High(ish) oil consumption is ‘normal’ for these Yams though.
These tanks can rust like crazy. Worse, if left for long they can do a seam, particularly bottom-left.
Yamaha calipers of this era have a rep for internal corrosion. Sticky pistons mean new seals. Blue spots are an option.
End can has a fetching brushed ally sleeve over steel, the rest is poorly finished mild steel and hence prone to rust.
Preload-only on first year bikes, fully adjustable the second. Seals pop on a regular basis. Drop 5mm for quicker steering.
Pressed steel and stiff, but finish is thin, so look for corrosion from leaking battery acid, or any crash-damage creases.
Rough running from the normally smooth mill can be down to poor balance plus the primary circuit is prone to gumming up.
Any original will be past it. A good aftermarket unit helps realise the handling potential. Linkage needs regular greasing.