Carb Advice Needed - 8N

HISTORY: Bought tractor 4 yrs ago. The man I bought it from purchased and installed a brand new carb ($200) because he thought the original carb was bad (it was gunk in the tank). From the time I bought it I've had to run with the choke half way out and it will run fairly smooth. With choke in it will stumble and die at low idle immediately and barely run at high idle.

Four years ago I took the carb apart and blew out all ports with carb cleaner (carb was 3 weeks old and appeared spotless) but absolutely no change or improvement. I checked for manifold leaks by spraying WD40 around carb and manifold - no change. Checked and reset timing - no change. Finally I gave up.

Help/Questions:
Ok so now I have the carb off again because I've got to get it fixed proper.

1. The carb #on stamp is: RE-TSX241B / RE-8N9510C. Is this a Marvel Schebler carb?

2. The cast housign and parts on the carb all seem to be outstanding quality and workmanship and the carb still is really clean internally. Should I soak in general carb cleaner over night and then flush the passages out just incase their is some unsean spec causing this grief?

3. Are the jets in the carb changeable - would this explain the extreme lean condition if someone had smaller jets installed?

4. Do you agree that this is a carb problem if 1/2 choke can create a rich enough mixture to get fairly smooth low idle and high idle? 5. Any other advice?

Thanks so much for your help - I really want to get this running correctly - hard to really enjoy it in this condition.

Paul

Good luck,
Dan

• Marvel Schebler TSX 241B carb

To answer yer question, YES, RE-TSX241B / RE-8N9510C is the "infamous Marvel/Schebler carb" designed for the 8N Ford tractor engine.

And yes, it is very possible that someone has crossed the idlejet (0.024") and mainjet (#49 drill = 0.074") they are both same screwsize and mechanically interchangeable. Use a 1/16" (0.0625") drill bit as a go/nogo gauge.

I'm gonna assume you know whichR and whereR the jetsR.

And yes, very possible that the idle jet is "clogged" which would cause lean-runnin' that you are semi-correcting by using yer choke to enrich the fuel mixture.

CAUTION: use "gun-smithing" type screwdrivers to remove the brass jets. Gunsmithing screwdriver blades are precision "hollow-ground" or straight-sided (NOT WEDGE shape) Use a 1/4 drive 3/8" DEEP SOCKET to remove the mainjet slanted emulsifier tube for access to mainjet..... ....Dell