How to remove clutch drum - Craftsman 25cc Gas Line Trimmer

The clutch type on Husqvarna chainsaws fall into two types, inboard clutch, this is where the drum is on the outside of the clutch, and held on with a clip, and outboard clutch, where the clutch is on the outside of the drum and holds the drum on. There are a number of reasons as to why you may need to remove the clutch and drum, to replace a broken spring, to replace the whole clutch,to lubricate the drum bearing, or replace the sprocket. On the pro saw range it is possible with outboard clutches to grease the drum bearing through the end of the crankshaft, there is a channel to the bearing from the outside, this is not possible on hobby, and domestic saws.
All Husqvarna clutches are just spun onto the crankshaft, with a left hand thread to make them self tightening, due to this they should NEVER be run with the bar and chain removed,and the clutch in place, or there is a very good chance the clutch will spin off on the over run, and can cause serious injury. Clutches should be jarred off against the compression of the saw, many have a 19mm nut on the outside so as to fit a socket, or the combination spanner supplied with the saw, the quickest way to remove this clutch is with an air impact wrench. If there is no nut on the outside, there will very likley be two cut a ways in the clutch spider, these are designed to take a flat screw driver blade, and with a suitable hammer you can strike the screw driver and jarr the clutch off, there is also a special tool for this type of out board clutch, it fits into the sides of the clutch with a 19mm nut on the outside part no. 502541601 available from Husqvarna dealers. The hobby saws from Husqvarna are produced in America, and as such use the Poulon clutch, this clutch should never be struck with a hammer, it is made from a sintered material and will shatter, there is a special tool to remove this clutch part no. 530031112.
The inboard clutch on the 371/372/365 also has a special tool available so as to use a 19mm socket, part no. 502522201.
The tool for the 357 clutch is part no. 502522202.
As a personal thing i never use piston stops, i have seen too much damage to internal engine parts when useing these, it is far better to jar the clutch off. As a rule of thumb you should not be able to pull the clutch shoes out by hand, if you can, the spring.springs are weak and require replacement, the clutch soes are also shamffered on there edge, the bottom of which is the wear limit.