Cleaning carbon from the valves?

[lynnmor 7,309]

The inside of the intake is exposed to gasoline whenever the engine runs, so no problem with the sealant.  Water will not easily pass thru a small crack, gasoline will act more like penetrating oil and make for a better test.

[Brockport Bill 1,668]

ahh, brilliant -  MANY Thanks - i should have paid more attention in Chemistry class

[Handy Don 12,237]

13 hours ago, Brockport Bill said:

heres photo of the vacuum hose fitting

I see it now. Didn't notice it before. That plus its attached hoses and gauge, do offer another opportunity for air leaks, for sure.

I assumed that gas, being "thinner" than water, would find smaller leaks or big leaks more obviously. @lynnmor many have a comment on this!

[Brockport Bill 1,668]

since you guys are so generous sharing your encyclopedic knowledge ...here's another realted question to this topic -- when i got the tractor and first started it, I ran it for few minutes and noticed the significant surging at mid throttle. Thus, I began the carb and manifold project....... However, I also noticed the vaccum guage is very erratic and rapidly jumps back and forth from low end to top end ....never settling anywhere. Does that give a glue what the likely surging issue may be? thanks

[Brockport Bill 1,668]

of course I meant to type Clue not glue - -

[lynnmor 7,309]

5 hours ago, Brockport Bill said:

I also noticed the vaccum guage is very erratic and rapidly jumps back and forth from low end to top end

 

Get that carburetor cleaned out and make sure that the welch plug just above the idle mixture screw in there.

[Brockport Bill 1,668]

make sure that the welch plug just above the idle mixture screw in there. --- 

 

i know where that plug is  - but what do you want me to do with it?

[Handy Don 12,237]

20 hours ago, Brockport Bill said:

... noticed the vaccum guage is very erratic and rapidly jumps back and forth from low end to top end ....never settling anywhere. Does that give a glue what the likely surging issue may be? thanks

Be sure the hose connecting to the gauge is heavy enough that the walls are not pulsing with the changes in pressure in the manifold. And of course, no leaks (if you spray a bit of carb cleaner around the hose does the engine react? Keep the cleaner away from the exhaust and do this before the engine is hot.)

 

14 hours ago, Brockport Bill said:

make sure that the welch plug just above the idle mixture screw in there. --- 

 

i know where that plug is  - but what do you want me to do with it?

The plug has to be there and air/fuel tight in its place. On mine, it's a ⅜" aluminum. Absent the plug, the idle mixture fuel supply is messed up, throwing the carb out of whack so it can never settle on the governor-controlled speed--surging happens.

[Brockport Bill 1,668]

will do