Liquid Wrench has been added, I've used it also with moderate success.
@FatMike That's a pretty good sounding concoction I think I'd like to try it out myself! I had bought a 4 pack of these 300ml bottles with fine tips for pretty cheap so I could make my MMO/Acetone mix and try others also.
https://www.amazon.ca/dp/B094MZ7NYT@TechnoChicken I've never heard of it, what's the parts store you got it from? Like a small mom and pops outfit or a chain? I think I might like to try me some!
@Nevadablue I agree about WD40, it's an excellent cleaner and does many things great but definitely isn't a penetrant, it is good for providing a little lube when loosening nuts from rusty bolts in a pinch though. You know it was actually designed for rockets and missles? "Water Displacement formula
#40"
@FlyFrog That mix or even just strait Seafoam will work on any engine, 2 or 4 stroke, gas or diesel, big or small give it to 'em all! Lol. The 2 are very similar in a sense they are both petroleum based detergents but MMO is an oil also and is the only one that you could run in all your fuel, all the time. Seafoam should only be used when required or a couple times a year as preventive maintenance.
With that said I don't know if it will cure your issue, I doubt it but it couldn't hurt to try some Seafoam at least. If your main jets are getting clogged there's something up or crud hiding somewhere that you haven't been able to get out or could even be the fuel line breaking down internally? I'd say a concentrated dose would be 25-30% of the fuel, I find if it's going to work that will be obvious in the first few minutes but it takes awhile to fully do its job, maybe up to a half gallon of fuel with it added.
I need to ask though, once you've torn down and cleaned everything does it run normal for a bit?