Hey KFUNK  I just picked up an 83 RX-50 at a garage sale.  Can u tell me what the battery model number is?   Do u know if it is OK to run it without the batttery?  The bike only has 970miles on it.  Got it for $300, in great shape except some dick let some white paint overspray get on it.  Love this group, I raced FZR400's for a few years.  Thanks for your time!!