Chainsaw Repair

40 and 340 are two of the model numbers that Husky has used two times, but I assume the kit is for the newer one, that they started making around 1998, and not the one from the late 1970s.

If so, the stroke of the 340 is halv a mm longer than for your 40 (which is the second type, if made in 1988).

Apart from that I don't know if it fits, but most likely not, as the saws are very different.

What likely will fit is a kit for the 45 or 49, that was in the same "family" as your 40 - or any of the closely related Partner or Jonsered models.