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In Reply to: c70 engine swap posted by iain on May 07, 2009 at 09:59:02:
The 'odd' mounts are on the 6volt C90.
The C70, C50 and the 12volt C90 share the same crankcase, hence the same mounts, so the easy fit for you is a 12volt C90 (after 1983ish) .
The wiring is a very different system on the 12volt, so you'll need the cdi unit, regulator etc from the 12v bike and change your system to 12volt. (much easier than converting a 12v engine to 6v, as the flywheel's a different fitting on the crankshaft!!)
The easiest way is in fact to fit the complete wiring loom, battery box etc from the 12v bike.. usually available on ebay.