Try this.....
Mike if you suspect that maybe part of the overhead assembly is noisy/dry.... while the engine is running dribble extra oil on the rockers..... one piston at a time .... and listen for noise going away......
Have you tried, while runing the engine, removing one spark plug wire at a time to see if there is a noise difference...... if one piston pin or bottom bearing is loose the noise may lessen if the cylinder is not firing.
Good luck
__________________
Bob Carriere....B.T.B
C15a Cab 11
Hammond, Ontario
Canada
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