Sorry to hear you're having problems, hope the cat is ok.
Generally helps to offer as much information as possible for suggestions.
Generator mod.# etc. Generators are usually rated in total wattage, running and peak.
Bogging down, meaning it changes tone slightly or totally stalls out?
Carb replacement? One would hope that whomever did this work would have tested the generator under full load conditions. Bet that was an expensive repair, I'd pursue that avenue first.
Hard starting and not operating under full or partial load could indicate an "ongoing fuel delivery problem". Adjustment, jetting, altitude, possibly even fuel quality issues?
Best of luck.
J & J
+ Kickr's the Vonderhund
, ES-38RSSA, 19.6K#
, 3500HD-Max, CC, 8'-DRW, 9.1K#