Carb rebuild or new AM?

[qurotro]

Here's what on it vs the OEM carb. What is the passage on top of the AM carb?
View attachment 164541

The one with channel on top called air compensater. Stihl use that to compensate dirty air filter.

 

[dmb2613]

older 029s did not have the compensater

 

[NCPT]

older 029s did not have the compensater

The OEM carb does not have a compensater. AM carb has it as well as the AM filter.

 

[1990Husky262]

I should Phrase my question differently . When the check valve is damaged (compromised) what are some of the symptoms? Thank You

Erratic idle/lean, engine dies on deceleration, while idling leans out and dies and have to use choke to restart , Check valves can also stick closed not allowing fuel flow at all( i have had certain carb cleaners do this mainly)

 

[Junk Meister]

Erratic idle/lean, engine dies on deceleration, while idling leans out and dies and have to use choke to restart , Check valves can also stick closed not allowing fuel flow at all( i have had certain carb cleaners do this mainly)

That is what I was afraid of My tillotson on the 056 mag is acting like that BUMMER will keep this in mind when I get it apart someday Thanks for the reply

 

[1990Husky262]

not exactly sure on that models carb, but a lot of times those older carbs rebuild better than these new carbs and they can be repaired. Have you rebuilt carb (actually replaced diaphragms)pressure/vacuum tested engine, compression tested, checked for worn intake skirt, etc. That can be the hard part of diagnosing 2 strokes cause a lot of issues will can have similar symptoms

 

[qurotro]

not exactly sure on that models carb, but a lot of times those older carbs rebuild better than these new carbs and they can be repaired. Have you rebuilt carb (actually replaced diaphragms)pressure/vacuum tested engine, compression tested, checked for worn intake skirt, etc. That can be the hard part of diagnosing 2 strokes cause a lot of issues will can have similar symptoms

Exactly. Older carbs are easier to clean, rebuild.
Those newer carbs are more complicated at fuel passages and got clog

 

[trooney]

The OEM carb does not have a compensater. AM carb has it as well as the AM filter.

Either put the aftermarket filter on or if you're going with the stick filter switch tops of carbs.

 

[trooney]

Stock