my dooms head gasket is a bit leaky it has sme oil on it,, so i think i ned to replace it ,, the curnt head gasket isnt company fitted one as its carb pipe holding nut was slipped and ,mechanic had to remove it and he replaced the gasket ,,
now the gasked currently installed is approx .9mm compressed ,, what gasket should i replace it with ,, also after fitting this gasket i think the bike power waas a bit lost,, so what type of new gasket should i install what is best one and how much would it cost for both gasket and installatioin..