RE: os 160 fuel problem
Hi
The real trouble on the FX160 is his 60F carburetor. This carburetor is originally designed to FX91. I think Os as fitted a FX91 carburetor on a FI160 (fuel injection 160) to civilizing the price.
I have a FX91 and FX160. On the 91, the 60F operate just on the limit of possible in middle range (a little bit lean) wen Hi and low range correctly adjusted. On the 160, It's impossible to adjust the hi range in Rich condition (3 turns and more on the needle valve) and if you run your engine in middle, your engine will operate w/o smoke and will stop on overheat and grip its piston in the liner.
The ultimate solution, for me, is the PERRY carburetor.
JJ Marier