I recently put some cutting time on this saw. After a while decided to clean air filter. Noticed the air filter was saturated with fuel. So I buy a rebuild kit and rebuild carb. It is a walbro wt-16b. Soaked over night after dissammbly in carb cleaner, then resprayed all passages again the following day and blew out with compressed air. Reassembled and installed. The air filter is still becoming saturated with fuel. So I think maybe metering level adjustment. I adjust flush with the carb body and saw runs terrible at this setting. Ran great at the other setting, other than the fuel issue. Any ideas. I have looked at the metering level guages for sale on ebay and it appears the wt series is not flush by looking at the tool.
Stihl 028 Super
- Thread starter bigair
- Start date
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Same problem
My 028 AV super has the same problem except the filter doesn't really get too soaked, but it is noticeably damp. When I took the filter off and started it a fine mist of gas seem to be coming back out of the carb. I'm not really sure of what could be causing it because I'm really not to familiar with engines. Take in mind though that was when i first started it after my uncle had it sitting around for about 10 years, and i haven't checked it out lately to see if it's still doing it because it still seems to be running fine other than I think it might be needing a carb rebuild soon.
My 028 AV super has the same problem except the filter doesn't really get too soaked, but it is noticeably damp. When I took the filter off and started it a fine mist of gas seem to be coming back out of the carb. I'm not really sure of what could be causing it because I'm really not to familiar with engines. Take in mind though that was when i first started it after my uncle had it sitting around for about 10 years, and i haven't checked it out lately to see if it's still doing it because it still seems to be running fine other than I think it might be needing a carb rebuild soon.
Worn piston on the intake side, most likely.
That's what they do. It is called spit back. The higher performance saws do that. Search function for spit back. Normal. Mike
lcso10
ArboristSite Guru
Check the tank vent hose which is at the left of the air filter. I know the 028's have spit back but check the hose and make sure its not leaking onto the air filter. Just a thought.
Tzed250
Addicted to ArboristSite
Common for a piston port engine to have spitback. At certain RPM's the mixture is pushed back through the induction system. It also causes the mixture to be "double-carbureted" and can cause a rich stumble on the way up the RPM's. On a piston-port roadrace bike you can see the spitback fog 3-4 inches behind the carb before the engine pulls itself on to the pipe.
