1993 CB1000 (Big one)
1996 Modified NX650
2016 CRF 1000L
You can buy spray cans of gasket remover, just spray it on and leave to work for a few minutes and then scrape away the softened gasket.
If there is some still remaining then repeat.
Wurth do a very good one called Décapant.
Be very careful using steel scrapers on thin and soft alloy cases, its easy to slip and damage the surface and end up with a leak.
Engine cases are closed, but there is still a 1mm play on the primary shaft. Like I have no washers left on my bench, I'm wondering if it's normal? Would it be fixed with the clutch on?