Here's a few pics of the 50mm VS the 51.4mm jugs......
50mm on the left, 51.4mm or the right. See the difference in the transfer tunnels?
Now, here is a 50mm jug. The passage on the right is the main transfer port for this side of the engine. Notice it's width.
How interesting. I did not even notice the difference in the transfer tunnels, and I have both the
371K and 375K here. Both are the circular saw equivalents of the 372, with a few minor differences.
If I can upload the photo, here are three jugs, from the 371K (50mm), and 2 Chinese 52mm big-bore upgrades.
Note the aftermarket 52s do not have this tunnel restriction. I did verify my 375K does have the
restriction. Since Husky did not make a 375 chainsaw, I can see why you got the jug for the 375K cutoff
saw.
Anyway, nice photo, MM, and thanks for posting all the good info. Porting one of the jugs right now.