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You may notice on EX500, that there's giant spacer on left-front engine-mount to account for this engine-mounting offset.
Use two frame-holes with wooden-dowels and metals brackets to make an alignment jig. Make a sharp pointer that touches centre of 250's output shaft. Then stack 500 engine up on wooden boards/shims until sprocket is in stock location.
Then you'll see how mounting ears line up. You can use two bolts, one spacer and one metal bracket per ear to reach motor-mounts on frame. Or cut off frame mounts, bolt them to engine and wiggle them around to see where to weld back on.
Front can use Z-shaped bar-stock between engine and factory mounts. Angle and depth of middle section to span offset amount.
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