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I find a soda straw in the spark plug hole works really well to judge what stroke your on as well, you can see it rise all the way to the top on compression and you know your at TDC. Get the flexible end type and bend the top at an angle to prevent it from falling all the way in. The rocker arms should "wiggle" a small amount when you rock them side to side. This is how I check the Guzzi valves without pulling all the rubber plugs to find the index mark.
Shifting to a high gear and using the rear wheel (on a stand) also makes it easy to cycle through strokes.
The timing marks also look like a good technique.
Here's a good video of how each stroke works for those who are curious or don't know already.
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