When you installed the new carb did you adjust it for your engine? Idle control, idle mixture, fast misture? Running only with choke indicates that engine is not getting enough gas routinely via the main jet.
Testimonial: "Unless I'm blind, there are no noticeable adjustments on this carburetor. I figured any adjustments were done at factory."
They are there but they don't want you to touch them. Under the idle adjuster you will see two round screws with no slits in them. You need special tool to adjust them. Emissions bs.
BTW, all engines are different and the replacement carb has to be tailored for the engine it is placed on. Store bought units are done at the factory before shipping.
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Give this YouTube video a look. Sounds like your problem.
Since you mentioned your fuel filter, make sure it and the fuel line are in good shape.
TroyBilt XP String Trimmer ZAMA C1U Carburetor Cleaning Quick and Easy
SOURCE: Troy Bilt Trimmer 75SS stalls at full throttle. new gas
Hello. Let me assist you. Since your trimmer runs but stalls at ful throttle it is telling you that there is a fuel problem. Not enough gas is getting through the carbeurator to satisfy the engines needs on full throttle. Most likely the carbeurator is gummed up. A common problem. Let's see if we can un gum it by getting a can or carbeurtor cleaner. Go to any auto parts store and talk to the clerk about your need.
SOURCE: TROY BILT TB 70 TRIMMER-NEW
If you rebuilt the carb did you turn any of the screws on the carb while cleaning or take out, you might have just the low idle screw closed a little to much open half turn and see what happens. If you look at the carb where needle screws are located on the side,if you have two screws it will be stamped with an " L " and?or an " H " next to each screw. If you only have one screw then turn that one, to left to get more fuel. Good Luck...
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