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I found the low idle RPM. But can't find the WOT RPM spec. This one is running right at 6,900 to 7,000. It sounds like it could run more, safely. But it's got limiters on it.

Anyone know what the RPM's are supposed to be at WOT?

Uses the 4140 engine with a maximum cut off speed of 9500 RPM but fan will affect actual load rpms. The only rpm spec given is the idle speed of 2800 rpm. What Stihl does is the air volume and speed. So it blow harder than a BG55 but less than a BG85. One note the BG65 does use the same parts so It doesn't make much sense as to why it blows faster.

And it is strange

all uses the same 34mm PNC just a different carb on the 45,46,55 than on the 65 and 85.