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That's just the way that 1st one looks, here are a couple other pics from the articles section:
Yes, sorry, you are right. Yoed
Actually, this is the only one which cannot be adjusted. You cannot buy it. It is painted wight on its head and it is factory adjusted to the Throttle Body. The three other valves are adjusted to it.
There is no adjustment nut on the #1 cylinder as it is used as the baseline for adjusting all the other valves. It appears that the plastic part that holds it to the throttlebody has broken at the thread, leaving the threads inside the throttlebody. It should be a simple matter of removing the old part, use something to help unscrew the broken threads from the throttlebody, and replace with new #1 valve.
#1 starter valve is the "master" and non adjustable. The other valves are synched to this one.
My assumption is that because it said "SET" that it included all 4 valves. If it does not include the #1 valve then I would check with the local dealer and see what they do to repair. The only difference is that the adjustment nut has been set on the shaft so it can't be adjusted. Makes no sense that you would have to buy a whole new throttlebody assembly just to replace this one valve.
First challenge will be to get the broken thread section out of the throttle body. Why could one not replace it with an adjustable one and just double nut it to remind you not to move it. I am assuming that except for the nonadjustability it is the same as the other three in design.
It would not be a big deal to take it out. It is a plastic thread and I can get reasonable access. I believe that this one is "calibrated" with the throttle body by Honda, and it is the reference for valve synchronization.
