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As you’ve got the spark plugs out to enable you to turn the engine over easily, the simplest method is to put a long screwdriver or similar down the plug hole and feel the piston rise up the bore
TDC is easily detected when you feel the piston “on the rock” at the top of the stroke, just be careful to keep the screwdriver from jamming if it gets out of line with the plug hole bore
Then the only thing to be aware of is that you’re looking for TDC on the compression stroke and not the top of the exhaust stroke
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