The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: iansoady on 23.09. 2010 14:39
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Have finally got the A10 propery up & running and it's going very well. However, when cracking along (say 70mph) there is a noise that sounds something like a blowing head gasket from the near side. It disappears at low speed / standstill which of course is the only time I can put my hand / head down there to feel for it - no sign of gas escaping. Compression is excellent on both pots.
However, what has just struck me is that I understand the engine breather exits from the crankcase just behind the primary chaincase. Could it be this making the noise?
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Could well be it Ian. If the head gasket is leaking you will see oil at the joint. Do a comp test after a ride when hot.
Cheers