26-10-2021, 08:49 AM
Thanks to all for these comments and suggestions. We think that the noise is much too loud to be ignition related, and that if it were a gudgeon pin problem there would be evidence in the bores. The crankshaft giving warning that it is on its way out seems most likely (since it is probably the original 1 1/8") and the engine is now going to come out for inspection and disassembly.
I will try to remember to update you with what we find.
I will try to remember to update you with what we find.