I fully agree. The micro-screen is right on the inside of the fuel-inlet passage.. When you remove that side of the carb, that screen is so fine, it looks like a softplug... and on the other side is the main fuel inlet.

We have a chemical here in the U.S. called B-12 ChemTool, which is a solvent, and it comes in a few types.. pressurized can is the best.. and it will blow out and clean even the smallest orifice in those carbs.. and it's very good at blasting out those micro screens too and making them like new. It seriously sounds like it's starving for fuel, and that screen we're talking about can block and hinder fuel flow when it's even remotely clogged.

Don't think just because that engine is "new" that it's not susceptible to such things. All it took was for that carb to get fuel through it one time years ago, and that could start that screen to clogging... especially if it's stored for long periods. You can't just start an engine, put it away for 5yrs, pull it out and expect to be like new(I'm really not saying you did that..but just sayin'). Sometimes you don't even need to start them... as the assembly and oils used can simply start coagulating if left for years. I'd be very suspicious of that screen, just as Planenutzz is.