The exhaust is mounted to the head by a ring nut compressing the flange on the end of the exhaust against a sealing washer. Unfortunately I do not have the rig nut and replacements are if the order of £40. Since they have to come from Germany they will incur high postage costs. Its cheaper to try to make one. As best as I can determine the ring nut is threaded externally to M37 pitch 1.5. The internal hole has to accept the exhaust tube and should be app. 32 mm. I decided to try and produce something using thick walled (3mm) 38mm od mild steel tube which I can turn down to 37 and thread to 1.5 on the lathe.
I was able to make a collar although it is rather thin and leaves a gap around the exhaust pipe.
Nonetheless the pipe could be fitted incorporating a compression washer between exhaust flange and cylinder head.
The replacement pipe is a little too long vertically and it was necessary to remove one of the silencer mounting bolts so that the silencer could be angled downwards to join the downpipe. In the long run I will probably make some hanger spacers to lower the silencer appx 2 cm so that it can join the downpipe and run horizontally without strain.
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