My wife's 150SP is hard work to start too - esp when it's been unused for a while. I was planning on having a look at the pilot jet in the spring as ours is a direct impot from Thailand and I assume it is not jetted ideally for the UK.
I'd have thought the Aus ones would have been re-jetted though? And I had planned on trying to find out what the Aus carb settings where to use a s a guide as the Aus climate is closer to that in the UK than the Thai climate.
If you have any info in English (settings, service data etc.) for the bike I'd love a copy if that's feasible?
Great little bike.
Cheers
Wb