I'm in the process of fitting the latter engine to my 85' xt600, to gain the clearance between the chain and frame i've fitted countersunk bolts to the seal plate and put a circlip on against the shoulder of the output shaft, i'm going to weld the spacer ring to the oposite side of the sprocket and machine it back a bit to allow the locking tab to fit, with it fitted like this i've got approx 10mm between the frame and chain
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