I would have the crank fixed. A Metro will not run well on two cyliners. When I bought mine number two was out. I was running on one and three. The motor ran real bad. It shook violently and had no power at all. It was all I could do to get it home, and I only got 34 MPG doing it. The 34MPG was due to the motor still sending fuel to the down cyliner, but the motor was horribly off balanced.
If you want to mess around with two cylinder motors I would look at motorcycles
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