2N Carb

[Big Butch]

I am having trouble with TSX 421B carb. With gas on , no choke and engine not running , gas will drip/run out the air intake .The engine will be flooded. The carb has been rebuilt ; another needle valve and seat was instaled but it still floods.It runs okay when started. What is wrong with the carb????

 

[Dunk]

(quoted from post at 20:16:39 09/18/09) I am having trouble with TSX 421B carb. With gas on , no choke and engine not running , gas will drip/run out the air intake .The engine will be flooded. The carb has been rebuilt ; another needle valve and seat was instaled but it still floods.It runs okay when started. What is wrong with the carb????

There is a gasket that goes under the needle valve seat, there could be a problem with it, or with the seat not getting tightened down enough on it, or the needle valve leaking.

 

[Dell (WA)]

Butch.......its FLOODING, that's what's wrong with yer carb. And when it floods, gas will drip/run outta the air intake just like its supposed to do.

While you claim you replaced the needle valve and seat, did you remember to check yer FLOAT????

Would it supprize you to learn iff'n yer float don't float, yer needle valve won't turn off the gravity fed gasoline.

Check yer float while submersing it in glass mason jar fulla HOT water and look fer tiny stream of bubbles. Simple, eh? .......Dell

 

[Anonymous-0]

I had a similar problem. The area around the seat was damaged. I used a oring instead of the gasket provided in the kit. Problem solved.

 

[old]

Could be one of a number of problems.
#1 rubber tipped needle that need to have a set put in it to seal.
#2 needle seat not as tight as it needs to be
#3 float not set correct or bad.
#4 bad area around where the needle seat screws in
#5 float sticks and does not move like it should because it is bent wrong or some how hits the side of the carb.
#6 fuel tank has a lot of rust/dirt in it and that in turn is getting into the carb and keeping the needle valve from working as it should.
And I probably missed one or 2 other things

 

[Jim in Ma.]

I had the same problem with a 9N I was working on. Turned out the little spring on the flapper for the choke butterfly was broken.

 

[JMOR]

(quoted from post at 08:17:06 09/19/09) I had the same problem with a 9N I was working on. Turned out the little spring on the flapper for the choke butterfly was broken.

"...no choke and engine not running , gas will drip/run out the air intake "

 

[Tom N MS]

Not unusual for me to be at least slightly confused but will someone please explain how the spring on the flapper caused this problem. Thanks