How do I replace string trimmer string on 4cycle Troy bilt string ttrimmer

SOURCE: put string on tb425cs troy bilt trimmer

there are two ways to install the string..the cool way is without pulling the inner reel off the trimmer..just leave it in place..cut (2) approx.two arms length (thats spreading your arms out like airplane wings) of .095 string..now, align the arrow of the inner reel (it turns counter clock-wise..the arrow points outward) with the arrow on the outer spool (pointing inward)..holding the spool and reel together so the inner reel doesnt move, push one of the cut strings through the eyehole in the side of the outer spool, and it should come up to the right, through a slot next to a small round hole the diameter of the string..if it doesnt, it just missed the exit (as i call it)..pull out and try again..let about an inch come thru..now take that end of the string and push the line into the little round hole until it stops, which should be about a little more than 1/8 of an inch..hold it in while pulling the excess line outside the spool to keep it in place..now do the same with the other string for the other side..once you have both lines in place, turn the inner reel counter clock-wise to draw in both lines through the eyeholes of the outer spool..you may or may not get all of the line to wind in..not a problem..you will still have enough to do what you need to do..just cut off the rest..one problem you may or may not have that i do most of the tyme is that it gets hard to turn the inner reel..one solution is to bump the top of the 'bump knob' with your fist, then pull both strings at the same tyme, then continue to turn..this method is quicker and easier than the second way of having the inner reel out and trying to wind both lines at the same tyme and trying to place the reel back in the spool..hope this works for you...

SOURCE: troy bilt 4 cycle string trimmer wont stay running

If this is an old unit, then the diaphragm is probably hardened.

Tests before hand would be:
1. Is the gas fresh and water free?
2. Is the spark-plug clean and snugly fastened?
3. Are you using the correct gas to oil mix ratio in your fuel?
4. yes...yes...yes...= bad diaphragm. Probably less than $5 for the part and a 1/2 hour to replace the part.

SOURCE: My troy-bilt TB425CS gas string trimmer gas lines

far enough so that you can reach through filler cap and pull the line out to attatch fuel filter.
then you can pull it back in and let it rest on the bottom of the tank

SOURCE: Troy Bilt string trimmer starts but dies when I

Try mixing up some fresh gas mixture if it is over 30 days old it is considered bad gas. Or the carburetor may need to be rebuilt.

SOURCE: Need info on putting line on troy bilt 4-cycle

Hold orange spool containing string while twisting the black plastic cap in the center, counterclockwise. This retaining cap is loosely spring loaded, so watch for the spring falling out. Once this locking cap is removed, the spool pulls right off.