my throttle stops at 1/2 inch because it hits the barrier frame part, I just noticed this today,,got it all back together and went to start it up ,but evidently I got too much fuel in the carb because it locked up on me and I couldnt start it, had to remove the head and use my .40 size starter to clean it out, it should be ready now but its dark out now..so is 1/2 inch full throttle? can somebody check for me please,, when I did have it running last week it was screamin pretty good,,oh when I took the head off I found 8 copper washers in it, I thought it was 7,which is alot but I want to make sure it is well broken in.....thanks..Rog

Hey Rog.....I think that 1/2" is enough for the plunger to be clear of the muffler opening (full throttle). When I still had the wood crutch I don't remember that being an issue.
Mark

Ditto

Mine is full throttle at 12mm from the wire hole to the edge of the plunger guide.
At 1/2 inch (13mm) you should be wide open.