Many thanks for the advice, so you would recommend to leave it as it is and just clean and decoke everything?
I also noticed on this thread that the pictures show each bearing for the relevant flap is riveted to the casing but when I ran my finger down the inside of the air way behind the bearings there are no plastic rivets sticking through its just smooth metal so perhaps these are melted on like you say.
Anyway thats not really important I just thought it was odd how they seam to be different.
I will do the inlet valves too as they are totally covered with build up of carbon.
Ill have a look at changing that seal on the oil filter housing too if thats worth doing.
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