Alright, I have all the parts and tools I need to get started.
As I said in the previous post, I am going to perform a quick engine tune up (i.e. change oil, spark plug, etc.) first before overhauling the carburetor.
CARB CLEANING TIPS
Here are some things to keep in mind before getting started:
- MAKE SURE THE ENGINE IS COOL TO TOUCH;
- Work in a well ventilated area;
- Place protective covering under the generator (I used heavy duty trash bags) to protect the surface from fuel contamination;
- Wear pair of Nitrile, Latex or Vinyl gloves (I cook a lot so I don’t want my hands to smell gasoline all day);
CARBURETOR CLEANING STEPS
STEP 1 – Remove the spark plug cable, turn off the ON/OFF circuit breaker switch and turn off the fuel supply valve.
STEP 2 – Using a 5/16″ socket to remove two mounting screws holding down the air intake cover. Remove the air filter.
STEP 3 – Move the choke lever to CLOSED position. Make sure the handle notch is lined up with a small notch on the metal plate and gently pull it up (fig.1.3). Do not use excessive force. If it does not come up, double check to make sure notches are lined up and try again.
STEP 4 – Using a 12 mm socket to remove two nut washers holding down the metal air intake shroud/housing. Remove the shroud and set it aside.
STEP 5 – Pry off the breather tube from the air filter housing by gently rocking it back and forth. Do not use any sharp objects.
STEP 6 – Using a pair of adjustable pliers, squeeze the hose clamp tips to open (fig.2.1) then slide it up. Gently pry off fuel hose from the fuel inlet (fig.2.2).
STEP 7 – Gently pry off the hose from the fuel inlet (fig. 2.2). Please note that some gasoline may drip out.
STEP 8 – Now we need to detach the carburetor from the engine by removing two long carb hold-down bolts. Just a fair warning that the Torx heads on these bolts are made from soft brass. Since soft brass is fairly easy to strip or crush, you want to use an external Torx to remove these bolts. If you do not have it, you can buy the E5 external Torx bit in this this Neiko set. (read my review here).
Whatever you do, be careful as these bolts are not available!
STEP 9 – While holding the detached carburetor in one hand, slightly rotate it to gently unhook the governor spring wire (thin) and a throttle linkage cable (thick) (fig.2.4).
STEP 10 – Using a flat (slot) head screwdriver, remove two screws and washers that are holding down the carb fuel bowel (fig.3.1). Be careful as it will hold about 2 oz of gasoline. Also, there will be a loose spring inside (fig.3.3). This is what keeps the internal plastic components (float, gasket-float bowel) in place. Make sure to keep it in a safe place. Note how in fig.3.2, you see reddish deposit on the bottom with some flakes. These are deposits from a stale gasoline. Use a small amount of carb cleaner to clean them as much as possible.
STEP 10 – A large plastic piece that is now visible is called a float (fig.3.4). Carefully slide out the hinge pin using a straight paper clip. One end of the hinge pin is crimped so it can only slide out in one direction so if you cannot easily slide it out, try pushing it in the other direction.
STEP 11 – Once a float is detached, there will be a small gray “needle valve pin” (fig.3.5, fig.3.6 and fig.3.7). This needle pin either opens or shuts the fuel valve so it is critical that tip needs to be free of any debris. Be careful as the tip is made of rubber and it will pop off easily (and very easy to lose!). Using some fresh gasoline mixed with carb cleaner (2:1 ratio), clean off all gunk (as stated previously I do not like using straight solvent on plastic pieces as it may chemically degrade plastic components) so what I did was to dip some cotton swabs in the mixture clean off the gunk. Fig.3.8 is the end result of that cleaning which took about 20 minutes.
STEP 12 – The remaining round plastic piece (gasket-float bowel) channels the gasoline flow. Note how the inlet and outlet ports are clogged with junk (fig.4.1 and fig 4.2).
STEP 13 – The inlet also has a small (ceramic) piece with an O-ring that gets open/shut by a needle valve (fig.4.2 and fig.4.3). Gently pop it out by using a Q-tip with firm force. DO NOT use an awl or any sharp, pointed objects which can enlarge the hole or worse, crack it.
STEP 14 – Using a thin wire, clean off as much gunk as you can, not just the hole but all surrounding area (fig.4.4) If there is gunk left, needle valve cannot seat properly which will flood the engine (which is what happened after my first clean attempt).
STEP 15 – This is what it looks like after thorough cleaning (fig.5.1 and fig.5.2).
STEP 16 – To pop the ceramic flow control piece back in, I used a small piece of leftover 12 AWG electrical wire. You can also use a Q-tip, but make sure you hear the “click” to ensure that the O-ring has been seated properly.
STEP 17 – On to cleaning the carburetor itself. VERY Carefully remove the O-ring seal and put it aside (Fig.5.3; BTW, if you are attempting to clean your carb that is still attached to the engine, it will be fairly impossible for you to re-mount this O-ring so you may *not* want to remove the O-ring).
STEP 18 – Using a carb cleaner, carefully and thoroughly clean all holes and grooves (I also used Q-tip to scrub the gunk off). Pay special attention to the inlet port where fuel enters the carburetor chamber. I ended up using Q-tips soaked with straight carb cleaner (no plastic inside the carburetor) to clean the inside, making sure to not leave behind any Q-tip remains.
STEP 19 – Now that all parts have been thoroughly cleaned, it is now time to reassemble the carburetor and re-attach it to the engine. Just use reverse steps to reinstall, making sure to install the retainer spring before seating the fuel bowel (fig.6.1 through 6.8).
The overhaul is not complete. Turn on the generator switch (marked as “ON” or “I”), open the fuel supply valve, set to full choke and pull to start. Hopefully that will get it to start up right away! My older generator actually sounded like it ran much better than my new Briggs and Stratton Storm Responder generator!
Overhauling a carburetor seems taunting at first but if you have some basic skills, it really isn’t that bad.
After replacing or cleaning the carburetor, make sure to test your generator every month (every 2 weeks during hurricane season) with electrical load for at least 30 minutes.
Also, constantly rotate your stock of gasoline (use stale gas for your car).
Well, that’s it for me 🙂 If you found this article to be useful, can you do me a favor and sign up for my newsletter? The signup form is found at the top of the screen on the right side.
Thanks and good luck!