'87 WR400/430 Tank Difference?

neither of my aftermarket pipes moves the mount, unless the pipe is distorted pretty badly, as I recall if you put the bolt in backwards and it's too long it's possible to be an issue
but the biggest there is too long of a bolt

Bolt was prob in backwards

a very common problem on vintage, when people take them apart and lose the original fasteners, they go to the store and get replacements, usually longer ones, sometimes the wrong grade, so they put the longer one in, seem happy it's back together, lower the tank on, now, out of sight, they have an interference problem, years later it wears through and you now have a disaster
when you replace a part that was not EXACTLY the same be sure no other part is affected, I can't tell you how many times I have seen this
classic is someone asks you to look at their bike, since you work on your own that makes you the in house expert, so you replace a few parts with ones from another bike
now I see it and the damage is deep, so off we go to find original parts or a remedy, all modifications should be seriously thought through

the clutch on my 400 was "ädjusted"with 12 spring washers at the cable ....desperately trying to negate the effects of a litre of coolant in the gearbox