For sure you need to just replace the diaphragm. As already mentioned, you cannot torch any kind of rubber components and expect them to still work properly--especially in the carb/fuel system as it is so precise. I would go ahead and pull the carb off, give it another good cleaning and get a rebuild kit for it ($15-$20 usually) and also a new diaphragm. That should kick the problem.
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2000 Yamaha Warrior
The Engine: .040" over Wiseco 10.25:1 piston--Port/Polish--Webcam 84grind--Titanium Valve Springs
The Air: Dynatek CDI--FMF Powerbomb header--HMF Sport Exhaust--K&N Pro Design Intake
Drivetrain: Barnett Clutch--Maxxis Razr2 fronts--ITP Mud Lite 22" rears--13/40 stock gearing--D.I.D. X Ring Chain
The Rest: ASR +2 A-Arms, Inline Fuel Filter, Full skids, shock covers, MSR handlebars, braided stainless brake lines, black painted frame, Powermadd hand guards, DG Bumper
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