Great pic's TB, is the JL a good bike?
I would love to have one of those restored CJ-750's but it will be impossible to get them on a Thai book.
Maybe a Chinese plated one and drive over the new Chiang Khong bridge every 6 months :-)
I have been to Suzhou very often as my companies HQ is there, very historic and quite beautifull area, specially near the huge Taihu lake.
IMHO the JH600 is a decent bike for China since at the moment it is the only Chinese manufactured mid-displacement dual sport-ish type bike available in mainland China for a reasonable price. There is the 400cc X5 by Shineray (with the copied Honda NX400 hundred engine), but the X5 has had it's issues. Aside from the 1st generation JH600 that had some EFI fuelling issues, seemingly the model has a pretty decent track record.
As far as the Chang Jiang CJ750... a classic looking model outfit, but owning a CJ750 not only provides a nostalgic look, it also provides the rider a nostalgic experience, where one has to deal with the high maintenance frailties and reliability issues. I occasionally ride an older 27HP CJ750 in the PLA military green, but never far from my home base. There used to be a well worn path to some CJ rebuilders based in Shanghai and Beijing, though today a little less so. Main issue aside from dependability and reliability, is that CJ750's in China cannot be plated 100% legally in a foreigners foreign name. That doesn't stop some shops and others stating otherwise which is BS.
One day about 5 years ago I was sitting at a local German owned bar sitting outside with one of my bikes parked very close by, as I was eating some food, when a foreign guy rides up on a nice shiny newly rebuilt CJ750 outfit. He'd picked it up that morning and ridden it 400km-ish from Shanghai down to this small third tier city where he and I both lived. As we were sitting there enjoying the food and conversation... I noticed a puddle start to form underneath his new ride. We both got up from the chairs and walked over, petrol was dripping down from the carburettor, which was mixing with a constant flow of drops of oil forming round the bottom end. He'd paid about CNY35K for that privilege.
There is a core group of guys in my riding circle, some of whom have owned the venerable CJ750's from bygone years, as that was all that was available for foreign bike enthusiasts here in the middle kingdo0m 20 years ago - all those guys would never touch one again, and certainly have nothing favourable to say about their ownership experience. However within that riding group there is one guy, a more recent arrival luvs the ownership experience with the CJ750 outfit, but he's always at the back of the rides, and almost guaranteed to need the set of tools he carries in the chair, at some point or another.
As far as crossing the border from/to China-Laos-Thailand, with a mainland China plated bike/outfit, the length of stay for the bike is related directly to the Thai visa that one has in their passport, up to a point. A 3 month visa, not going to be a problem to keep the bike in Thailand that long, anything beyond that - could be a toss up. Might mean having to make regular runs/visits to the Thai Customs Dept, to have the length of stay extended.
YMMV