easy way to tell on any engine type or config of cyl is to check cam or rockers and look for what cyl has both valves closed at that cyl tdc.
that cyl is at the start of its power stroke. now turn crank in correct directon to find next cyl and so on till your back at the start cyl.
all 4 std cyl inlines will be 1-3-4-2 or 1-2-4-3
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