After good ideas for a bike to restore or rebuild that has a good community & readily available parts?

Long story short, came to bikes later in life.

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Neighbour had a 2006 GPX 250 rotting in his garden hedge (AKA the Kawasaki Ninja before it was called a Ninja) that he said I could have for a six pack, which I did.

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Spent 2 years restoring/ rebuilding it via workshop manuals and YouTube. Got my Ls and learned the basics.

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It was a decent project though some parts were quite hard to find as the GPX was superceded by 1 or 2 further generations of Ninja which eclipsed it in terms of spares availability and just general public exposure.

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Now I'd like to tackle my first 'big' bike. I'd like to restore or rebuild something 1975-2000 or thereabouts, that has a large following and easy availability of spares here in Australia.

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What sort of bike would I like? I'm not sure. Maybe a 90s 600-1000 Jap bike, or a 70s British tourer. You tell me.

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Some points to remember: by no means am I a qualified mechanic or an experienced rider. Hence I rely heavily on YouTube and I'm specifically after a bike with a big following/ lots of spares.

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I'm not going to build and ride my next bike overnight, so comments like 'you're a novice and so you'll be dead in a week if you ride a 90s Jap sports bike,' might be justified, but not really relevant. I'll be riding the GPX for a while yet and any project will likely be years in the making.

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Suggestions welcome. Cheers!