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No a 1986 Cylinder will not fit the 1987 KX 125. The 1986 exhaust port comes out on the left side of the cylinder where the 1987 comes out in the center. It may bolt up, however the exhaust will not be able to mount.
Yea the fuel tank will fit
NO it changes from 01 to 02
Yes it should fit the frame not sure if tank will fit as the 91 barrel and head are bigger
yes but it might take some modification.
Nope, its 03-07 or 08 and 97(or so)-02
Yes it will fit, I have a 98 carb and my 86 model kx125
NO, as the bore size for both bikes are different.
If same engine, yes.
yeah but it depends on if the exaust has been altered
with minor modifications yes it would fit. but it wouldn't just bolt straight on.
Yes - but you will have to swap the intake manifolds and probably the exhaust manifolds.