The frames were slightly different.Only where the coolant bottle mounts.On the 86 it mounted near the left footpeg.On the 85 the bottle went under the seat.The 86 had a different airbox setup too.The 86 airbox and tubes will not let you mount the 85 collant bottle.So if you make the switch,you would have to get the 85 airbox and snorkels and 85 coolant bottle.The swingarms were different too,but will interchange.The 85 front forks and tripples had more outward rake to them and were smaller in diameter.The 86 tripples and forks were raked in and had bigger tubes.As far as the frontend,all you can do is take the forks out and check them for being bent.My 85 mx z is very slightly tweaked up front and I am pretty sure it is in the frame.I have seen a few that looked that way.
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