Stihl ms 211/c circa 2010 replacement carb

[bmp01]

On 04/12/2025 at 20:34, John Rainford said:

Not sure where to locate the check valve.

It’s part of the high speed circuit, the brass bit that pokes into the carb venturi. It delivers the ‘hi speed’ fuel into the carb. 
Check valve description because it stops (or checks) the air in the venturi from flowing the wrong way through the hi speed circuit and into the metering chamber at idle.

 

Did you check the fuel line in the tank for leaks, does it run ok on a full tank?

🙄🙄….or is it accelerator piston o ring shagged again….🥱🥱

[bmp01]

Oops I didn’t spot the /c bit in the title… it has a purge bulb?

Check the bulb operation and pipes for leaks. Worth noting: if the one way valves in the purge bulb assy stop working you effectively have the carb’s metering chamber connected to tank pressure. 

[pleasant]

44 minutes ago, bmp01 said:

Oops I didn’t spot the /c bit in the title… it has a purge bulb?

Check the bulb operation and pipes for leaks. Worth noting: if the one way valves in the purge bulb assy stop working you effectively have the carb’s metering chamber connected to tank pressure. 

The c doesnt necessarily mean it has a primer. Got 3 in at the moment and none have.....the cb-e model is the 'comfort model with the primer, ergostart and tool less chain adjustment 

[bmp01]

30 minutes ago, pleasant said:

The c doesnt necessarily mean it has a primer. Got 3 in at the moment and none have.....the cb-e model is the 'comfort model with the primer, ergostart and tool less chain adjustment 

Okie-dokie.

[John Rainford]

No purge bulb on my saw. Thanks for the heads up on the check valve, I will rake a look.

[John Rainford]

I've had the fuel filter off and checked the fuel line. All looks good. Makes no difference to running issue with a full tank or half a tank. I started it up today and ran it for a few minutes to take an inch of the christmas tree trunk and remove a few lower branches and no problem. Trouble is i'll start it next time and it will probably stall at idle.