hi peter,
the frame dimensions are definitly different.
but you are right,
of course the 2KF engine fits in a 3AJ frame.
the dimensions/fixing points engine/frame are the same
BUT
the transmission axle of the old xt modells (34L, 43F, 55W, 2KF/2NF) is shorter than the ones in the new models (1VJ, 3AJ, 3TB/3UW).
which leads to a different position of the sprocket and a smaller frame and different swingarms. the difference (10 mm) is only on the left side of the frame / of the swingarm.
because of this it is principally possible to mount any xt600 engine in any xt600 frame.
so if you mount a new engine in an old frame (or vice versa)you have to do something about the chain alignment (front and rear sprocket are not inline, 10 mm difference).
in your case there are two possibilities:
1) use 2KF-swingarm and -wheel and place a 10 mm thick spacer between swingarm and frame
2) use 3AJ-swingarm and -wheel, but with the sprocket carrier (is this the correct english word?) from 2KF.
(or buy a new chain set every 10000 kms ;-)
regards
klaus
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