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You say you have spark. How sure are you, it's at the right time? You can check this with a strobe attached or crank the engine manually and listen closely for 'cracks' while watching the timing marks. Has the advancer been apart? Also check spark isn't 'leaked' from plugcaps and/or HT leads to the head.
Pretty sure most manuals will explain how to set static timing with a simple test lamp arrangement it's not as accurate as using a timing light but certainly good enough to get her running.
@julie thanks! Out of curiosity, how do you know they have a resistor? The spark plugs were DR7ES so the wrong ones! I'm wondering if that bike was really running in the past now...