A blocked torch liner is one of the most common causes of annoying wire feed
trouble. It should be replaced periodically to ensure a smooth, consistent wire
feed. Generally, you can tell when it’s time to replace the liner when
the wire keeps shooting back to the copper contact tip, even when the wire feed
speed is increased.
Now standard fit on Clarke hobby MIG torches, these HD steel liners can give
considerable wire feed improvements in comparison to the black PVC type liners.
*Rusty welding wire is also a very common cause of wire feed problems so when
replacing torch/neck liner also replace the welding wire if it is rusty, otherwise
you will quickly block the new liner and be back to square one!