Chainsaw Repair

I forgeted something : it did only one tank since I got it... with the air filter absolutly clean.

Is the rubber gasket under the air filter?  There is supposed to be one. You can convert it with to Husky 272 HD AF.  Will give you PN's tomorrow if you want.
Shep

The 670 is not "known to load up"; I don't understand why guys make statements like that. The stock air filter set up should work fine as long as the gasket between the filter and filter holder is there. That same set up was used on several Husky saws in this family along with the 288's. There is no need to upgrade to another system.

The nylon filters can often appear to be clean and free of sawdust, but the screen is still clogged. If so, the intake air will try and find it's way around the filter. Need to clean it out with an air compressor or gas and a soft brush. As bad as the dust was described by the OP, if it's not a missing seal, it could be a torn filter, or the two filter halves aren't fully closed and that might be a leak.

Here in the US, those filters are NLA in either flock or nylon style. However, the 266/288 filters will fit under the Jonsered top covers, so that's the only way to go.

Saws of this era had poor filtration systems with minimal surface area  (stihl, jred, husky) and lack of centrifugal separation.Here on the west coast It was common place to modify the Husky /jred of that era with aftermarket filtration systems that added surface area and increased the cleaning interval for logging operations.  The saw in your avatar as well as many commercially modified fire vent saws used aftermarket filter systems for this reason.

I have some times wondered how much that really helped in the long run, considering the time spent when you finally had to clean them, versus how fast it was to clean the original mesh filters?   

Saws of this era had poor filtration systems with minimal surface area  (stihl, jred, husky) and lack of centrifugal separation.Here on the west coast It was common place to modify the Husky /jred of that era with aftermarket filtration systems that added surface area and increased the cleaning interval for logging operations.  The saw in your avatar as well as many commercially modified fire vent saws used aftermarket filter systems for this reason.

In that context I agree with what you are saying. I thought that your earlier post singled out the 670 as being worse than similar models of the period, and that was the point I was contesting. (or thought I was)

I recently discovered that Cutters Choice, who still makes those Fire Vent saws from the 2166/2172 has quite a dealer network and those air filters and parts are easily accessible in most areas. Also, most of the filters have been redesigned and are now "non-crushable" unlike the one in my avatar. And they don't cost any more than the standard filters.