Thank you for the reply. What is the needle valve guide? Why I was wanting to know about the 260 was the 44mm piston it is just a fuze bigger than the 250's. Thought there might be a possibility of a jug swap. And also I have noticed china made jugs, pistons and overhaul kits are very cheap. Are these good quality replacement parts or have people been having problems with them.
The 260 is made different. the 250 does not have a jug as such. There is no way they will fit each other.
China made jugs are hit and miss. You cannot depend on the quality and even if they are the best, they never get better than genuine OEM. Hyway brand seems the most consistent.
The needle valve guide is a rubber piece that fits over the three adjustment screws on the side of the carburetor to the outlet holes on the outside of the chainsaw.