The Walbro pulse comes from the tapping which normally pressurises the fuel tank ... on that dreadful YS pressurised system.
Left the silicone regulator in situ, 'cos I don't use it. The engine uses normal aspiration, with a conventional glow carb mounted on a stub pipe.. a bit like a Laser engine. In my experience, petrol just causes silicone parts to swell up. Anyways, it hasn't proven to be a problem, thus far.
As I recall, I was using something like a 10% petroil mix.
The whole thing was just an experiment; the engine was subsequently re-converted to glow fuel. It did run very well on petrol, though.
Yeah, it would be a bit more tricky with a two-stroke engine, having a forward-mounted carb. Rear-induction types would be more appropriate.
There's a guy at our field who uses those special plugs. Same problem that all the conversions have ... carburation. A Walbro will very likely see you right. Prop clearance might be an issue, unless you are careful.