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For me, three wheels would work in nice package---I  had 2 Messerschmitts in the 50's, one new, one used-   compared to sidecar outfit in the winter, fine, even had heater and radio possibility---KR 200, 200cc Sachs 2 stroke, nice price, rode nice, spare tire by removing front seat you could actually sleep in it---nice when you had no money.  Somebody in England made replica with Helix power.

No interest in what is on today's market in US---rode sidecar outfits for 40 years---nice when bike makers made bikes that actually could handle the sidecar----had new Harley outfit with tin sidecar, fine, strong,   engine could not get rid of heat when ridden hard=blow up!!   enjoyed and liked MZ 2 stroke outfits and loved their price.....few mods, 300cc kit, KONI SHOCK ON SIDECAR wheel.

Helix----to get to valves, merely take seat off, one bolt----valve adjust, easy---had 4 new Helix, liked them----only problem all day riding, BUFFETING!-----built in trunk, nice.   3 US models, one Japan (Fusion) it appeared  nicer running that US models. As  recall about 175,000-200,000 with them.   Worked good in WI cold winter weather---always started.   

Best bet in N America----on hands in rain/wet----Aerostich over mitts----=work, still good feeling on controls, add some warmth.

If after idle speed is set correctly-----bike still creeps, just use brake to hold.   Don't things apart until   necessary.

Bike in use every day----at 15,000 miles on my Xtown300i---at 15,000 miles I just changed belt and rode on----took me about 6 month to get the 15,000 miles.

Try Heidenau.     I also like Michelin Power Pure SC---they wear round.   Got well over 10,000 miles from one on return trip from Alaska!

Swing arm bushings----replace period.  used to be problem with Japanese bikes---really screws up handling.   Your case, bike age and miles(km's)

As bike/scooter is tool to me and I like to depend on them with dealers/importers----In Chattanooga with dealer in Dalton GA, my 300i fine and good bike built as least to the standards of the Japanese---When I moved to WI, sold my Kymco, WI not Kymco land---have talked to many dealers who had them in the past---out due to importer -----Kymco fine scooters, but need good dealer network and strong importer to back them up-----Same problem with Daelim, great scooter in Korea, ruined in US by weak importers.   I buy only new and have had over 75 new bikes/scooters since 1955----importer problem can also be dead scooter market in N America