Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

Is there a simple way to disconnect the governor arm from the carborator? I've removed the bolts that hold the carb on but it won't slide off (It needs cleaned big time) because the of the linkage to the governor arm (wire rod and spring).  The shop manual says to remove one of the two screws that hold it on, but I'm not sure which one should be removed or what will happen to the governor if I do remove them.  I have heard that governors are really hard to adjust and I was trying to avoid that agrevation.  I've labels the two screws "A" and "B"  (one of them is really a bolt).

friiy wrote: The motor must have been made in Japan so I just assumed it was a Mikuni carb.  But maybe you are right.  I'll have to  take a closer look.  Would a TK carb have the letters "TK" imprinted on it?

Yeah,  Funny round little circle with "TK" in it,  (rounded edged letters)....I thought I saw the logo in the photo..

What model of engine is this? what is it on...  I can see it is gummed up in the photo.   and has not run for sometime.

....Brown fuel gum deposits under the choke butterfly..

Friiy

Is the carburetor's model number also printed ?  I'd like to find a rebuild kit or a direct replacement. 

Kits are not really needed ,  There is only about 3 or 4 things that may need to be replaced at worst case....

1) float inlet needle

2) Bowl  seal (large o-ring goes around the bowl and seals to the carb body)

3) bowl bolt seal

4) float and pin

Unless the carb is Rotted out with water and full of powdery residue...   I would only change the the parts that are un-serviceable after cleaning.

The float is un-ajustable, the needle is only thing that is hard to tell it it is bad without a trained eye...  But  if It leaks after being put back together then needle is suspect..

About everthing can be reused unless the carb is rotted out or full of green and white powder..

as for a carb model it Should  be printed on it,  But who knows... What modle of Yamaha is this and what type of thrower (model)?

Thats most likely about $85 for that carb.

Good Luck,

Friiy

I've got it apart and now I'm trying to free the jets and nozzles. There's quite a bit of corrosion, we'll see how it goes.

#9   7KF1434221 JET. PILOT (#42)
#10 7KF1434345 JET. MAIN (#90)
#11 7KF1434100 NOZZLE. MAIN
#13 14T1439202 VALVE. NEEDLE

Ref # Part number
1 7KF1450100 CARBURETOR ASSY superseded by 7KF1450101.
2 7KF1422700 WASHER
3 7KF1416200 BOLT. HOLDING
4 7KF1419100 PLUG. DRAIN
5 6461421201 SPRING. PILOT ADJUSTI (3 needed)
6 7KF1421100 SCREW. PILOT ADJUSTIN
7 7KF1421600 SCREW
8 7KF1438400 GASKET. FLOAT CHAMBER
9 7KF1434221 JET. PILOT (#42)
10 7KF1434345 JET. MAIN (#90)
11 7KF1434100 NOZZLE. MAIN
12 3671438600 PIN. FLOAT
13 14T1439202 VALVE. NEEDLE
14 7KF1438500 FLOAT
15 7KF135550000 MANIFOLD,INTAKE
16 7KF1355710 GASKET

It doesn't look that bad from what I see ( no heavy pitting),   It looks as though you cleaned of the corrosion...

When I take out the main jet to get to the nozzel,  I get a good stubby screwdriver with  the right size blade width for the main jet slot,  then I grind the shaft of the screwdriver to fit in the well hole of the main jet/ nozzel tower. I grind the shaft to so i don't screw up the threads for the bowl nut.  I take the carb body and put it in a vise with soft faced grip ( so I do not tear up the carb)..... If the Main jet is going to be difficult, I tap it with the screw driver and hammer lightly.   If that does not work I may heat the main jet with a small pencil torche for a moment to break it loose (brass heats up quick and expands alot).   Sometimes "Mouse's Milk" or " Aero-kroll"  penetrating oil may  help. 

Good Luck,

Friiy

I wonder if there is some special tool they use for this.

This is good advice.  I can do this.  I'll get busy grinding down my screwdrivers.

I don't know why the jets and nozzle woul be critical to the carb getting gas into the bowl.  The fact that the bowl remains dry seems strange to me.     When I removed the carb the bowl it is still empty. I know for a fact that the float is working and that the little needle valve on the spring is dropping down (to open and let fuel in) but no gas is dropping into the bowl.  The carb is fed by a small diaphram fuel pump and that is working (there's gas under pressure when I remove the fuel line connection to the carb).  So why is the gas not dropping into the bowl?  I don't think its the jets, their job is to mix the air and fuel.  Am I right about this.  This has me baffled.