Fred Rawling Posted June 8, 2018 Share Posted June 8, 2018 I know that a steady 8 late means late valve timing. What I do not understand is why it changes when the engine warms up. This is a 1928 engine with timing gears and no chain. Link to comment Share on other sites More sharing options...
Barney Eaton Posted June 9, 2018 Share Posted June 9, 2018 May have something to do with the choke being partially closed causing the higher reading. Link to comment Share on other sites More sharing options...
Bloo Posted June 9, 2018 Share Posted June 9, 2018 Could the valves be tightening up enough to leak? I would expect them to loosen with heat on an overhead valve engine, but it doesn't always turn out that way. Link to comment Share on other sites More sharing options...
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