High Quality Chainsaw Bars Husqvarna Toys

TS420 Carb Needle Valve Pop Open Pressure

Automender

Active OPE Member
Local time
9:46 PM
User ID
16276
Joined
Apr 18, 2021
Messages
40
Reaction score
26
Location
Ohio
Country flag
Working on a TS420 Stihl cutoff saw and came across an issue in the carb. On a K970 Husky I did the same test and the pop off pressure was about 15 psi. On this Stihl carb I did the same and I pumped it up to 25 psi and it didn't pop the needle valve. The needle valve is not stuck since I can press the metering lever and it pops. Is this normal. Also what is the sealant they use on the oblong welch plug in the picture?

IMG_4430.jpg
 

riverrat2

Semper Fidelis
Local time
8:46 PM
User ID
431
Joined
Jan 7, 2016
Messages
600
Reaction score
1,425
Location
N. Orange County, TX
Country flag
I don't have my repair manual handy but 17 PSI is pretty normal for Stihl Chainsaws, I will call the Shop tomorrow and find out for the TS420...
I'm working out of town this week
 
Top