Jard you need to check that the bottom head is clean and there are no obstructions. Then check that the coil is in tight and the nuts are not loose. Finally have you been using the correct fuel mix? Clean the fly wheel with some lubricant spray and sand paper and re assemble.
SOURCE: Troy Bilt 4CC Trimmer - starts fine but won't turn off - TB425CS
Try cleaning up the switch button with Electronics Spray - you can get it from Wal-Mart for $3.
Usually is a bad contact or could be a broken wire .
SOURCE: Troy Bilt TB 465SS Pony 4 cycle weed trimmer won't start
Sounds like you need to take the carb. apart and clean it. I like to use a Den Tek Brush, (used for cleaning teeth), to clean the small ports in carb. they work great for this job. Make sure to either clean or replace the small screen in thcarb. as well.
Jim
SOURCE: Troy Bilt trimmer model # TB575SS no high throttle
Dont replace the carb! The gaskets are what wear out on walbro carbs and the like. Specificaly the fuel inlet membrane which is under the removable plate opposet of the throttle plate.It is a black gasket with a small metal button in the middle. This regulates the fuel supply. If if is still flexable then it is good. Usually they become crisp after sitting for a couple years. Start with a gasket set( 5 to 10 bucks) Then try adjusting your fuel and air mix needles if need be.
SOURCE: Troy Bilt 4-cycle trimmer won't stop!
Take the switch so it is accessable
take the two wires and touch them together or hook them together bypassing the switch
does it shut off or it should not have spark?
if so you have a bad grounding problem if it does not shut off,if it does your switch is still bad
2 wires one tied to ign. module and other to a metal ground all the switch does is dead short. the igniton to shut down the spark and in turn kills the engine.
Be sure your grounding is tight and clean and all wires are intact and making good contact to their designated areas (no broken wires)
hope this helps some for you
SOURCE: Troy-Bilt TB425CS trimmer hard to start, won't accelerate
Hi the key is moulded as part of the flywheel on most machines these days which doesent take much to sheer off , By the sounds of it this may well be your problem.
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