I am needing some serious help on a 1984 Yamaha 220 Plus (220AETO). It turns out that the "Microcomputer" has gone out and I can not find another one. I have spoken with Yamaha USA and Yamaha Japan and both of them say this engine was not built there. To the best of my knowledge it was made by Yamaha of Australia.

The motor is in great shape other than the computer, which I can not find a replacement for. Does anyone have any idea where I can find a computer for this engine or if there is a way to bypass the computer and install a mechanical timing advance?

I would greatly appreciate any help on this!