The washer you talk about is a "Thrust" washer... It is so the centre hub sits correctly on the clutch bearing and correctly spaces out your clutch components..
Although I can not guarantee that it is causing your clutch problems, it certainly won't help with it being missing and without and you will no doubt damage your clutch.
From memory of most clutches, it is a fairly thick washer so without it, you clutch has incorrect spacing... I could make sure you replace it immediately..
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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