028 AV Super spits gas out of the carburetor

   / 028 AV Super spits gas out of the carburetor #1  

Sodo

Elite Member
Joined
Apr 21, 2012
Messages
3,198
Location
Cascade Mtns of WA state
Tractor
Kubota B-series & Mini Excavator
I like this saw, I inherited it from my father-in-law.
I had to replace the coil once.
And it was stolen but the cops got it back for me.
It reminds me of him when I use it and I like that.


Does anyone know why its spitting gas out the carburetor?

Full throttle.
Starts and idles but won't rev out.
Rope pulls hard (good compression).
It ran "pretty good' after I rebuilt the carb, but the power seemed to diminish each time I used it (which was not much use).
And of course I was adjusting the mixture screws trying to get it to run better but nothing helped.
I have been able in the past to adjust mixture screws & get full power.

One guy said to check the exhaust screen.
I had forgotten about the exhaust screen dangit.
That makes sense it the power would diminish - and I will check it but the saw is 125 miles away right now.

Any other ideas?
 
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   / 028 AV Super spits gas out of the carburetor
  • Thread Starter
#2  
Screen is clean, dangit I was hoping for an easy win.
 
   / 028 AV Super spits gas out of the carburetor #4  
Does that model gave an intake reed valve assembly between head and carb? If yes check to confirm that the reed valve is closing properly to prevent crank pressure from pushing out the carb.
 
   / 028 AV Super spits gas out of the carburetor
  • Thread Starter
#5  
Exhaust screen was not plugged at all.

028AV exhaust screen.jpg


No reeds. Piston looks perfect, almost like new.
028AV exhaust port pics.jpg

Took the carb apart and found the filter was plugged with very fine “stuff”. Almost like an algae or something. Shot starting fluid at it and it was gone instantly.

It seems to run well but haven’t put it “into the wood” yet😉. Tomorrow.
 
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   / 028 AV Super spits gas out of the carburetor #6  
Carbs are easy to clean and rebuild. Kit the carb over buying new. Kits 5-15.

Spitting out of the back to me says might be some wear on intake side of piston. Just a WAG and hope in your case isnt why.
 
   / 028 AV Super spits gas out of the carburetor
  • Thread Starter
#7  
I cut my 24" Doug fir. Standing dead, dry, real nice wood! Got it done, but I don't feel like the saw is running right. It has a 24" bar on it (too long) but I don't keep the whole chain in the wood.

It has very little power when the H screw is at the 'basic' setting (1 1/4 out). The saw still runs, cuts OK with the H screw all the way in (seated). I backed it out 1/2 turn offf the seat, and it cuts a little better than when seated.

Is this normal? In my simple mind it shouldn't run at all when seated.

AND..... I expect that the H screw would have a significant effect upon the power output - but it's subtle. It's been awhile but I expect that it should lean out and scream, then I turn it out a little and it should settle down and 4-stroke. I can't get any '4strokln'.

Comments?
 
 
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