I have a 79 RD400 Daytona, I'm not sure of the last time it ran, it has 30mm mikuni's on it, with DG performance pipes, and a wiseco piston. My problem is that the engine will not start. I think it may be the battery cause it receives no spark even when it is on a 6 volt battery charger. Would you happen to know the exact battery needed for this bike. I will be greatful for any help given.