Hi and welcome to FixYa. I am Kelly.
Does it sound like it is running rich (Black smoke) or lean can not reach normal speed)?
In either case. Here is how to clen the carb properly:
Before you start.... if you have a digital camera take "close up" PICTURES of the linkages and springs attaching to the carb. If this is your first time you will be so glad you did. You can always delete them later if you don't need them. :)
Here is what you need to do:
1. Fuel selector off
2. Remove float bowl mounting screws and nut
3. Remove the BRASS Jet / Orifice in the very bottom of the venturi tube inside the pickup tube. (Flat blade screwdriver) Hold the Orifice up to the light. You should see a pinhole. If it is not clear clean the orifice but do not force anything through the hole.
4. Underneath the Orifice there is yet another BRASS tube that you need to remove. (Flat blade screwdriver) Make sure all of the holes in the tube are clear. The tube will be over 2 inches long. Clean it and reinstall it.
5. Reinstall the Orifice.
6. Using a catch fuel container turn on the fuel selector. Fuel should flow at a good rate. GENTLY lift the float assy level and make sure fuel flow shuts off. When you drop the float again fuel should flow.
If you do not have fuel flow at this point the needle and seat will need to be inspected. Fuel selector OFF.
(The following procedure is to be done only if there is no fuel flow with fuel selector on.)
a. Remove the silver float pivot pin retaining screw
b. Drop the Float down (The needle will come off with the float. NOTE the position)
c. Inspect the tapered rubber of the needle If should be pointed. If it is not pointed then the rubber tip is stuck inside the seat.
d. Clean the seat hole ONLY if obstructed. (Easily damaged)
e. FUEL Selector on then off fuel should rapidly flow through the needle seat.
f. Renistall Float and needle making sure to get the pivot / hinge pin installed correctly and reinstall the silver retaining screw.
g. Fuel selector ON. Raise and lower float checking for free movement with fuel flow when lowered and stopped when the float is raised level.
NOTE if fuel does NOT stop when float is level you will need to bend the float tab (tab up if level is too high or tab down if level is too low) where the needle attaches to the float assy until it does.
7. If there still is no fuel flow at this point remove the fuel hose from the carb and check fuel flow. If no flow check that gas tank exit hole, fuel filter (if installed) and the selector valve assy for obstructions.
Reassemble connections.
FUEL FLOW IS GOOD
Step 8 is VERY important"
8. BEFORE you install the float bowl inspect the bowl nut. There are 2 holes in the side of the nut where it screws in to the bottom of the carb that must be clear.
9. Install Float bowl mounting screws and nut. Check for leaks.
10. Test engine.
That should do it.
Thanks for using FixYa.
Kelly
The comment in my first post was for a HONDA engine.. it is different for a B & S 6.75 hp engine. Will post B & S procedures later today.
Kelly
Now lets go through B & S carb cleaning:
Before you start.... if you have a digital camera take "close up" PICTURES of the linkages and springs attaching to the carb. If this is your first time you will be so glad you did. You can always delete them later if you don't need them. :)
Here is what you need to do:
1. Fuel selector off
2. Remove float bowl mounting screws and nut
3. Localte the Air fuel Jet on the side of the carb and count the number of turns it takes to close the Jet adjustment until it is just snug.
4. Remove the Jet / Orifice in side of Carb (spring on screw stem)
5. Using a catch fuel container turn on the fuel selector. Fuel should flow at a good rate. GENTLY lift the float assy level and make sure fuel flow shuts off. When you drop the float again fuel should flow.
If you do not have fuel flow at this point the needle and seat will need to be inspected. Fuel selector OFF.
(The following procedure is to be done only if there is no fuel flow with fuel selector on.)
a. Remove the float pivot pin.
b. Drop the Float down (The needle will come off with the float. NOTE the position)
c. Inspect the tapered rubber of the needle valve It should be pointed. If it is not pointed then the rubber tip is stuck inside the seat.
d. Clean the seat hole ONLY if obstructed. (Easily damaged)
e. FUEL Selector on then off fuel should rapidly flow through the needle seat.
f. Renistall Float and needle making sure to get the pivot / hinge pin installed correctly
g. Fuel selector ON. Raise and lower float checking for free movement with fuel flow when lowered and stopped when the float is raised level.
6. If there still is no fuel flow at this point remove the fuel hose from the carb and check fuel flow. If no flow check that gas tank exit hole, fuel filter (if installed) and the selector valve assy for obstructions.
Reassemble connections.
FUEL FLOW IS GOOD
NOTE: If you have carb cleaner spray it into the side needle jet hole. If no carb cleaner squirt gas in hole and make sure it exits on the bottom of the carb.
7. Install air fuel mixture needle jet in the side of the carb. Turn until closed and then back of the same number of turns it took to initially close it snug before removal.
8. BEFORE you install the float bowl inspect the bowl nut. There are holes in the side of the nut where it screws in to the bottom of the carb that must be clear. (could be no holes in yours)
9. Install Float bowl mounting screws and nut. Check for leaks.
10. Test engine.
That should do it.
NOTE: This engine was made with 2 different carbs. One had a choke the other had a primer bulb. If the primer bulb has a hole in it the engine will start then die after a few seconds.
Thanks for using FixYa.
Kelly
Just a personal safety note... when your doing this.... Stay away from flame sources like dryers or hot water heaters. Poof and smoke tests are not part of this repair. :)
Briggs and Strattom 6.75 HP
Before you start.... if you have a digital camera take "close up" PICTURES of the linkages and springs attaching to the carb. If this is your first time you will be so glad you did. You can always delete them later if you don't need them. :)
Here is what you need to do:
1. Fuel selector off
2. Remove float bowl mounting screws and nut
3. Localte the Air fuel Jet on the side of the carb and count the number of turns it takes to close the Jet adjustment until it is just snug.
4. Remove the Jet / Orifice in side of Carb (spring on screw stem)
5. Using a catch fuel container turn on the fuel selector. Fuel should flow at a good rate. GENTLY lift the float assy level and make sure fuel flow shuts off. When you drop the float again fuel should flow.
If you do not have fuel flow at this point the needle and seat will need to be inspected. Fuel selector OFF.
(The following procedure is to be done only if there is no fuel flow with fuel selector on.)
a. Remove the float pivot pin.
b. Drop the Float down (The needle will come off with the float. NOTE the position)
c. Inspect the tapered rubber of the needle valve It should be pointed. If it is not pointed then the rubber tip is stuck inside the seat.
d. Clean the seat hole ONLY if obstructed. (Easily damaged)
e. FUEL Selector on then off fuel should rapidly flow through the needle seat.
f. Renistall Float and needle making sure to get the pivot / hinge pin installed correctly
g. Fuel selector ON. Raise and lower float checking for free movement with fuel flow when lowered and stopped when the float is raised level. If the float is anything but level when the fuel shuts off then the needle valve tab retaining the needle valve head will have to be bent slightly up or down until fuel stops when the float is level.
6. If there still is no fuel flow at this point remove the fuel hose from the carb and check fuel flow. If no flow check that gas tank exit hole, fuel filter (if installed) and the selector valve assy for obstructions.
Reassemble connections.
FUEL FLOW IS GOOD
NOTE: If you have carb cleaner spray it into the side needle jet hole. If no carb cleaner... squirt gas into the air fuel mixture needle hole and make sure it exits at the bottom of the carb.
7. Install air fuel mixture needle jet in the side of the carb. Turn until closed and then back of the same number of turns it took to initially close it snug before removal.
8. BEFORE you install the float bowl inspect the bowl nut. There are holes in the side of the nut where it screws in to the bottom of the carb that must be clear. (could be no holes in yours)
9. Install Float bowl mounting screws and nut. Check for leaks.
10. Test engine.
That should do it.
NOTE: This B & S engine was made with 2 different carbs. One had a choke the other had a primer bulb. If the primer bulb has a hole in it the engine will start then die after a few seconds.
Thanks for using FixYa.
Kelly
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