Question about Troy Bilt Tb70ss Gas Trimmer
Bought new gaskets for Troy built 70ss gas engine. Installed gaskets but no results. Weedeater runs while choke is on, then runs for five seconds after choke and dies. Seat and needle were not replaced. Would that make a difference? Have taken carburator apart several times, cleaned everything, replaced lines. What is next? Used new gas and oil mixture. Weed eater/trimmer is about 2 years old.
Thank you for any help you can give.
The needle and seat (esp. the needle) meter the amount of gas/oil that is being allowed into the metering chamber of the carb for use by the engine. Your problem does seem fuel related. These carbs are very temperamental and scare most folks. A guide to how they work can be found here: www.zamacarb.com/pdfs/TechGuide_2007.pdf
This will give you an understanding of what exactly you are dealing with. You may only require a diaghram kit or rebuild kit to get the carb back to the functionality it was designed for. That info can be found here once you know your carbs exact model number.
A troubleshooting guide for these carbs is included in the first pdf file, look it over maybe and see what you think. Post back maybe later after going to school (doesn't hurt to learn how they work). We will be here. I know you want to use this machine (its the growing season) but there are so many things that can be wrong that it needs to be narrowed down...sounds like fuel starvation and just may need to clean the inside of the carb with something like the brake parts cleaner spray. It is non-flammable and doesn't damage the sensitive parts inside these carburetors the way ehanol and harsh carb/chokle sprays and strong solvents due...NEVER soak these carbs in a "Gunk style" carb cleaning tank....it will seriously damage sensitive internal parts and check valves!
Posted on Jul 10, 2010
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Posted on Jan 02, 2017
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