I don't really know if you can cause any damage when trying to run an mc21 with a dead battery, so I wouldn't recommend it. On the other hand, and you shouldn't do this until one of the pro's give some advice, but I had a totally flat battery and the only difference it made was that the lights flickered at night. It still started on the first kick every time. The battery was that flat that the oil light wouldn't glow at all and obviously no rc valve movement.

I don't know if my bike is good, bad or just a little strange like it's owner. All I know is that a flat battery had basically no effect on it.

Andy

Bandit7