Question about Troy -Bilt String Trimmer/Blower Attachment #41AJBT-C966

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Troybilt TB75SS String Trimmer will only run choked to partially choked. I can throttle it and it runs rough but will accelerate with about 1/4 choke. less than that it dies. Not much smoke I expect I should see more. I suspect I need to richen the mixture. No obvious mixture screw found. There are two small cam type devices in top of the carb. One red the other white. They may be some sort of mix adjustment. Any idea where I can find a manual for this?

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I was having the same problem I replaced the spark plug and cleaned the exhaust a bit. Mine had an adjustment screw on the carburetor (facing up) and I adjusted it while it was idling with full choke. When I screwed it IN (down) it increased the throttle ... I went too far and the engine raced a bit but continued to run (roughly) after releasing the choke. I turned off the engine and backed out the screw a bit and restarted. It seemed to idle normally and then I was able to slowly increase the throttle and the engine run. I noticed that there was air in the gas lines and figured it could be because I only had little gas in the tank. I put the plastic housing (with air filter) back on, filled the tank half full and restarted. I still ran roughly for a bit but I was able able to slowly increase my throttle until it reached half power and then it ran fine. I went ahead and did 30 minutes worth of trimming and it was like new. I will see if starts and runs ok from cold but at least it ran today. I had not seen anyone mentioning the adjustment screw.

Posted on May 03, 2010

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It sounds like your carburetor needs a good cleaning. You must disassemble the carb., clean all the ports with a small Den Tech Brush, (used for cleaning between teeth). They are very small and perfect for this job. You will also want to clean the small screen in the carb. It may be so clogged that it may need to be replaced. If this is the case, you will need a carb.kit for your Troybilt Trimmer; it comes with small parts and gaskets. (It will come with some gaskets that you will not need.) Replace all old parts with the new ones. This should fix your problem.

Posted on May 22, 2009

  • Jim Parker
    Jim Parker May 31, 2009

    Did this solve the problem?




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