yes, the high speed mix screw is closer to the air filter.
How many turns out do u have both screws?
Gun it and if it bogs and looks like it is going to flood, Let it settle back to idle, turn in the HI screw a little more like 1/8 and keep doing that. By using a non original carb on my fs65 and 80's mine are not the standard 1.5 (or whatever) turns. my low is 2 and high is 1/8 turn.

When you get it close to running right, you might have to adjust both because there is speed midrange where it draws gas from both high and low. Your case, your idle (if currently high enough) may go lean. etc. So as u reduce the high speed fuel and it wont idle any more, give it a little more gas for idle, etc.

No matter how I set the high-speed jet it always almost dies when the throttle is increased. I set the highspeed to 1 1/2 turns from stop and the low speed to the same. It's really hard to start - but when it does the low speed runs too fast and the high speed dies when the throttle is increased. Trying to slow down the low speed does nothing to get the high speed to run - does nothing to help with the hard starting problems. .Like I said, I'm running the machine using the choke on the new carb - and leaving the choke on the original air cleaner open..

First, i didn't say to slow it down, i said as u adjust the HIGH FUEL MIX it will affect the mid range mix. if you are talking about "..So as u reduce the high speed...", that is AFTER you get it to run high and only need to trim. Given, ideal would be 1.5turns for both screws but when u r hacking like i said...

"...it does (run,) the low speed runs too fast." vs your original post: "When the trimmer starts at idle," is misleading.

Does the gas cap have a hole in it? if no hole, leave the gas cap loose when u are testing. It IS a gravity feed carb...

Before taking the trimmer to the dump, one last attempt.was made. Reset both jets to 1 1/2 turns, loosened the gas cap. It started and ran perfectly. Could have been the gas cap. Now I need to build a usuable handle for the choke lever on the new carb. That little tube is completely useless. I don't know why the carb makers couldn't make a useful handle on that little tube. Many thanks to "out_sider" for all the ideas. It was much appreciated.