Introduction

This guide takes a little more work than some of the other lawn mower replacements. You first remove the air filter, and then go behind it to remove and clean the carburetor tank. You will use a socket wrench with a 5/16" and ½" hex bit and a prying tool. Before you get started, you may want to purchase an O-ring if your lawn mower is old, as the O-ring in the carburetor tank may be worn. Cleaning the carburetor may get messy, so do not attempt it inside.

Image 1/1: Use a Flathead #4 screw driver to remove the 40mm screw that holds the air filter case in place.
  • Make sure the the engine is off and the spark plug wire is removed and away from the spark plug before beginning.

  • Use a Flathead #4 screw driver to remove the 40mm screw that holds the air filter case in place.

Add Comment

Image 1/1:
  • Use your hands to pull the air filter case out of the hinge at the bottom.

Add Comment

Image 1/2: Use your hand to remove the plastic backing to the air filter, exposing the carburetor. Image 2/2: Use your hand to remove the plastic backing to the air filter, exposing the carburetor.
  • Use a socket wrench with a 5/16" hex bit to remove three 20mm bolts behind the air filter.

  • Use your hand to remove the plastic backing to the air filter, exposing the carburetor.

Add Comment

Image 1/1:
  • Note: There is a plastic washer that may come off when you take off the plastic backing. This is normal; just set it aside and save it for reassembly.

Add Comment

Image 1/1:
  • Use a socket wrench with a ½" hex bit to remove 11mm screw on the bottom of the tank.

Make sure you empty the fuel, remove the fuel tank, or clamp the fuel line before you do this step, or you'll get fuel everywhere!

Calion - Reply

Image 1/2: Completely remove the tank so you can clean it or replace it. Image 2/2: Completely remove the tank so you can clean it or replace it.
  • Once the bolt is removed from the bottom of the carburetor tank, gently pry open the tank with a metal prying spudger until it pops off. If you do not have a spudger, a flathead screwdriver will work.

  • Completely remove the tank so you can clean it or replace it.

The thing that is most important to clean here is the screw in the bottom. It has holes which, if clogged, will prevent your engine from running for more than a second or two. Make sure you clean them out with carburetor cleaner. It's easy to miss, as it falls out into the socket when it's unscrewed.

Calion - Reply

Image 1/1:
  • Inspect the O-ring inside the carburetor tank. If it is dry and worn out, you may need to replace the O-ring before you reassemble your device.

Add Comment

Conclusion

To reassemble your device, follow these instructions in reverse order.

9 other people completed this guide.

Tim Wirtz

Member since: 01/30/2015

434 Reputation

1 Guide authored

Team

Cal Poly, Team 6-31, Amido Winter 2015 Member of Cal Poly, Team 6-31, Amido Winter 2015

CPSU-AMIDO-W15S6G31

4 Members

6 Guides authored

8 Comments

I just performed a carb tank cleaning based on your DIY and it took less than 30 minutes! The best part of the cleaning was an immediate start of my mower on the first pull. Thanks

Jerry - Reply

Nice guide. My mower was only running on choke, any other throttle setting and it would die. A quick online search indicated dirty carburetor and subsequently I found your guide. Gave everything a good clean and voila! Good as new.

Tania Miller - Reply

Slide clamp on fuel line back and pull fuel line off carb. plug line with old pen/pencil

Remove two nuts holding carb onto engine. Remove nut holding engine choke arm on top of carb. Then remove two springs and one carb adjust metal arm. Note places of attachment

spray cleaner in all brass jets, use fine wire to clean out all orifices, clean bowl attachment nut. Spray cleaner in to choke area and tip upside down and spray under the bowl needle.

drain old gas out of tank and alternatively add a in line fuel filter as well a new air filter.

clean or repl spark plug

jim steinberg - Reply

Excellent suggestions, as well.

Charlie Farrell -

yes, this is a better guide for cleaning. the other should be called "how to inspect your carb O-ring"

kevin -

My B&S 675 is on a Craftsman WeedTrimmer. It has no Manual choke. Only a primer bulb. I can't get primer bulb to pick up gas. I have put on a new carb and a new bulb. What else could be causing the prob? If I spray B12 in carb it will crank and run. Help please?

Steve - Reply

took off cover, that plastic washer was cracked. what is the part number for that? i need it replaced as this is where a fuel leak was happening.

Scott Dilzer - Reply

Excellent directions, but I have one minor critique. There is a lot of gas that leaks out when doing this. Maybe, suggest pinching the gas line? Otherwise, this was great!

Charlie Farrell - Reply

Add Comment

View Statistics:

Past 24 Hours: 40

Past 7 Days: 355

Past 30 Days: 1,611

All Time: 13,975