This is a guess: It may start if a kick start which I assume as how would you know there is a spark.
However it will have no lights or horn they are powered through the battery and using it on the road in the UK will be illegal and classed as un-roadworthy with no lighting. Don't try by passing the battery either you'll blow all the lights and horn and possibly cause the wire harness to overheat and catch light while riding it.
Dynamo/alternator compensates for current used by the battery(as in a car) magneto supplies the spark. Well that's how my BSA worked. Ok so its a long time ago and may have got part wrong but I am aware of the LAW.
Bob
May 2014