all i have to do is swivel both of mine with the tank off to get to the needle. on the 450, i usually pull the starter to get the bowl off. not so with the mk1 on the 650, just a swivel there.
it's in the doc fella! it's right at the top of carburation.
no fanny flaps, block left fuel line and just fit the one on the right and use the right tap. make a FS adjuster as in my gallery or buy a ''kouba T from sudco.