GPZ600r valves

My GPZ needs the inlet valves (only the inlet) adjusted every 2500ks (starts to get hard to start).
Any ideas (already tried differant fuel and fuel additive)

sounds like the valve seats are well and truly fucked mate.

You need to get the head re-conditioned with new valve seat inserts.

Talk to Albert Tehenneppe at Sharptune in Dandenong.

i do have another head in the shed( and i'm not even from tassie).
might give it a fitting.