Wal's Harley Project

Here's Wal's Iron Head Sportster 1984
It's been laid up 12 years but the previous owner is a mate of Wal's an assures him it's a sound bike.
It needs the brakes and lights sorting out and a few cosmetic jobs, but the main problem is getting to spark properly. It sparks a bit and then stops, any suggestions from Harley experts welcome...

The long term plan is to chop / bob it.