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The Shinko 705 is good for what you want and doesn't give up too much on road. A little slower on initial turn in. If it is dry then the TKC80 large block knobby actually does quite good but I'm betting you would be happier on the Shinko.
I have left mine on the left side for an hour or so with no problems. Fired right up with no smoke or anything leaking. Similar to other suggestions you can build an A-frame hoist with a few pieces of wood and ratchet straps
Looks a bit like the insert that goes inside the rubber grommet on the windscreen mount. Have you changed the windscreen and possibly dropped it from the factory windscreen?
I've ridden a lot in Arkansas (rocky ground) and did the COBDR on my NC. The cast wheels are not an issue as long as you keep the tires at 25psi or higher. I have taken a small chunk out of the front rim at 20psi. Interestingly I didn't loose air and only found it a few days later while washing.
I'm 6'1 ~35" inseam. I did Rox Risers, lowered pegs, slope mod, and finally seat concepts. With those 4 mods I finally got to where I could ride all day without any real issues. Did an unplanned iron butt running 1,200 miles in 24hrs straight without too much discomfort.
I also would be hesitant with aluminum extensions. My concern would be the strength of the threads. As for having someone local make them, all they should need is your existing fork cap to measure thread pitch and depth.
It is silica in some antifreeze that kills the seals. Honda cars and motorcycles require silica free......least that is what I remember from back in the 80s.
I do something similar. When assembling I coat the axle and mating surfaces of the spacers, bearings, seals, etc with waterproof grease. I also push grease between the seal and bearing then make sure grease is in the dip in the seal where it fits against the axle. That stopped water entering...
I'll throw my thoughts in.........I normally advise a noobie to get a used 250/300 CBR/Ninja or Rebel as their first bike since you can or could get one for ~2k ride it for a year to learn and better decide what you want long term. You can sell it a year later for basically the same price. They...