Hello Keith

I would try to tighten the cylinder head bolts. That may give you a temporary fix.

Sepp manufactures cylinder head gaskets but you need to remove the head and measure the gap first. You don't have time to do that.

You will need to remove the engine to get to the head. It's not a simple job. You will need a head gasket, a cam chain rubber gasket (it sits adjacent to the head gasket) and you will need exhaust gaskets as the exhausts need to be removed to get to the engine.

I have either bought individual gaskets from Yambits or gasket sets from eBay. Athena is one of the brands I have used satisfactorily.

Let me go check my box of bits and see what I have.

I hope to see you at the Rally.

Regards
Kevin

I was having problems finding a cam chain tunnel seal/o ring. No-one seems to sell them separately. So thank you, Mr Emery.