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I don't know but I am going to guess.

4.5mm is my guess.

I have the Gen 4 Service manual open and that is the size of the tool that goes in the valve guide to act as a pilot for cutting the seat, thus the valve stem appears to be 4.5mm since it should be the same diameter as the pilot tool.

Someone else will chime in for sure.
 

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The valve stem diameter of the Gen4 is 5.5mm earlier generations are 4.5mm the stems are also longer on the Gen4.
Glad that you who has actually measured posted up as I would have never guessed the valve stems would be 5.5 when both the Gen's 3,4 and 5 service manuals all list a 4.5mm arbor and and reamer.

Guess that shop manual cant be trusted, good to know since a 5.5mm valve aint going in a 4.5mm hole so the valve guide must be 5.5 based on your info.

Good stuff.
 
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