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I bought new a 2006 f2.5..in 2006. Used it every day, 7 days a week from april1 to nov 15….until I wore it out in 2014. So I am a bit confused by the reed valve and slide valve carb referral. Sliders usually have a fixed low jet with adjustable air screw. Butterfly usually have a low adjustment for fuel. The butterfly carb on mine had a fixed low jet with air screw.
As soon as I started mine I knew I had to find the plug that hides the low air adjustment as it barely would idle. Also the high jet was too small for proper operation. Remember they are jetted to pass emissions…not for optimum operation.
I found the plug that hides the low adjustment air screw. Drilled a small hole through the plug..carefully so as not to drill into the adjustment screw. 1/2 turn clockwise to cut some air with an eye glass screwdriver made it a whole nother motor.
…and yes that low jet is very small and is probably plugged as mine would be plugged about every other year upon spring startup even though I ran it dry in November. Ya need to pass something through the jet to confirm its open.
The end for my f2.5 came in 2014 as it started to blow oil out of the crankcase from blowby…even though I changed the oil constantly with premium oil.
All this assuming your 2015 is like my 2006. Looks like it is…
So in closing find the low speed air screw plug…mod it so ya can adjust it properly….remove the low jet, clean the jet and make sure its open…don’t guess.