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There is a small breather hole that leads the crankcase pressure to the inlet, this hole can be blocked if the gasket is mounted wrong side up.

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That is what I was referring to when I said "restricted crankcase breathing due to incorrectly fitted top cover gasket"
I did not want to labour the point as Gaz22 seemed to be saying that he knew it was correctly fitted. It is mentioned in the Workshop manual Paragraph 21 in the "assembly" chapter. It is something that should be rechecked I think,

I don't understand the suggestion that it should be run at high speed for a period. After a re-bore one would normally follow a running in procedure of gentle running for a period.

Even if the bores are OK it could still be problem with a piston or rings, but let's not go there just yet.

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Old Chemists never die, they just fail to react

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