• Please be aware that we have recently gotten a wave of users that, when researched, are found to be from Nigeria. They are trying to sell products and asking to be paid through Zelle or Venmo leaving users with no recourse if they don't ship the product. If you suspect this activity please contact admin and we will research their information to verify their location.

ArboristSite.com Sponsors
Peak Industries


Stihl CS Vent - The Tube With Two Screws In It. Stihl Techs?

hotajax

hotajax

ArboristSite Member
Joined
Aug 16, 2016
Messages
62
Age
77
Location
Eastern PA
So I have an 021. Seems to run pretty well, except after it's been cutting and you sit her down. She idles down almost to a stop, and then catches up just before it dies. Does this every 10 or 15 seconds.
I took the saw to an old farm boy and he listened and figured out the tank wasn't getting enough air in to vent it. So he removed one of the two screws from the OEM tank valve. (The OEM fuel vent is a tube with 2 screws in it) Problem fixed. Idles fine, all day. But I'm pretty sure this valve will leak if the saw goes on it's side. Question: Is it OK to use one of newer white bell shaped tank valves? Gotta be better than the old design. Thanks in advance.
 
hotajax

hotajax

ArboristSite Member
Joined
Aug 16, 2016
Messages
62
Age
77
Location
Eastern PA
Thanks, Harley. Came through again!!! Looks like it's quite a trick to get that second screw way down in the tube. Looks like you'd have to perform surgery to pull that off.
 
Mad Professor

Mad Professor

Addicted to ArboristSite
Joined
Jul 2, 2007
Messages
8,872
Location
North East USA
That is a simple setup that has worked well for many years on many saws.

As Harley mentioned, push the screws into the tubing. A small allen wrench works good (3mm/1/8")

Stihl manuals have depth to push each screw in. One ~ 3/4" from tank side the other at the vent end of the tubing.

If you only use one screw put it at the end of the tubing, so fines won't clog the tubing
 
Top