ive got one of then crappy neon plug caps that the custom boys used to use, it was great for finding misfires, but I dont think you can get a long reach one like many suzuki's use ????? the one ive got is the short one.
thats what my gsx750 is doing, it has a very slight weep and looks like its coming from the gasket at the front of the cam chain tunnel. but after cleaning the oil off go for a run and you can see the oil running down the outside of the chain tunnel just underneath where the long nut and O ring live. will get round to replacing them at some point
on my 1100ET i used a 5/8th offset (about 16mm) 530 sprocket. but i also used a standard GSX1100 rear carrier that fits my 1200 bandit wheel. if you don't bring the rear sprocket further in to the wheel it wont line up right and it'll hit the frame. I have about 3mm clearance between the tyre and the frame. yeah its close but no contact YET
yeah im sure people have and it wouldn't be too hard to do, but most people fit more modern forks so they can use more modern wheels and tyres as well.