Chainsaw Repair

I have 5-10 of these and it came out as said as limbing saw of 44cc. There was two types of ignitions and not the strongest either of them.

It can be found with some different carbs but I think HK is most common.
This is same family as the 452 and 45 that was first out I believe. 452N came with nordfeller that was accessory only on 451.
452 had that swiveling bar system that engaged chain break same as 410 series.

50/51 was first out with .325 from factory in 1971/72