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Ranwell1
Ranwell1, Small Engine Technician
Category: Small Engine
Satisfied Customers: 10085
Experience:  I Own a Lawn Mower Sales and service business (37years). Have 2-cycle and 4-cycle certification.
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I have a craftsman 6.75 lawn self propelled ez start mower

Customer Question

I have a craftsman 6.75 lawn self propelled ez start mower and it won't start. I tried cleaning the filter and then replace the spark plug. If I sprayed some starting fluid in the carb it will crank for about two seconds. and then nothing. I took of the air filter to see if it is getting gas when I sprayed starting fluid in the card, And it appears to be getting gas, although I am not sure if it is enough to keep it running. This mower is only a year old. Not sure what to do, is there a carb cleaner I can use to clean the carb? Or is there some other test to see how much fuel it is getting?
Submitted: 3 years ago.
Category: Small Engine
Expert:  Ranwell1 replied 3 years ago.

Customer:

HI

Customer:

I will be happy to help

Customer:

The problem is that the carburetor is partially restrictec or plugged and needs to be cleaned and rebuilt.

Customer:

Here might be what I call an emergency fix, but I want you to still read the rest of the answer as this may be just a temporary if it works.


 


 


The nut that holds on the carburetor bowl has several small holes in it. Some are on the sides and one may be in the end. In order to completely clean the carburetor correctly, you MUST clean these holes with a tag wire or a jet drill. (If a jet drill is used, DO NOT use a drill that is bigger than the hole or the engine will run too rich.) If the Picture does not show up, click on the Blue Text and you will see the picture. There is ONLY 1 picture. The picture may not look exactly like yours but it should be very similar....even if you have an adjustable jet screw...but the tiny holes may be on the sides of the jet instead of the middle.


 


 





























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Here is my comprehensive carburetor and fuel answer that may give you some ideas.


 


As engines sit or get older, fuel that is left in the carburetor can turn to gum and varnish and cause this and other problems. Also, any gasoline that was left in a gas can for a period of more than 30 days must be discarded because it also has begun to turn to varnish.


 


Today's gasoline's contain MTBE and alcohol. (Ethanol) They turn to "Junk and garbage" very quickly. Alcohol is partially water (H2O). And they call it "Oxygenated fuels! It is the oxygen that breaks down the organic compounds in the fuel and turns the gas to "Garbage" (Gum and varnish) The fuels we had just a few years ago had no alcohol in it and would store for longer periods of time before going stale... and fuel stabilizers do almost nothing to prevent the fuel from going bad with the changes in today's fuels.


 


Do not buy gas from the "Discount" Stations. The discount stations get a reduced price on gas because they may be buying fuel that is nearly 30 days old already. You may be getting fuel that's nearly stale right from the pump when buying from a discount station. Purchase your fuel from the well-known stations such as Shell, BP, Sonoco, Phillips 66 etc.


 


More than 70% of all of our repairs in our lawn mower business are due to this same issue. You most likely have dirt, gum, varnish...etc in your carburetor plugging up the small passageways and jets in the carburetor.


 


The carburetor must be removed from the engine. Clean all parts with carburetor cleaner and blow out all the small holes and passageways with compressed air. Remove all of the non-metallic parts since the carburetor cleaner will cause them to be disfigured decompose and plug the carburetor as time goes on.


 


Wash the carburetor cleaner off of the metal parts by washing them in warm, soapy water then rinsing with clean water. Dry them by blowing it off with compressed air. Make sure that all the passageways are blown dry before reassembling.


Reassemble using a NEW carburetor rebuild kit.


 


DO NOT TRY TO REASSEMBLE WITHOUT USING A COMPLTE CARBURETOR KIT! You will just end up having to do the job again.


 


ALWAYS clean the fuel tank and replace the fuel line when doing this repair or you may have to do it all over again. The inside of the fuel line disintegrates over time and these small pieces of rubber will plug up the carburetor too. Dirt and water from a dirty fuel tank will also plug up the carburetor. Find the Model, type and serial or code numbers off of the engine and take them to your local dealer to get the carburetor repair kit.


 


If you do the work yourself, take pictures or at least make a drawing of where all the linkages, gaskets, and component parts go. Correct reassembly is critical.


 


If the carburetor still doesn't work correctly, you may have to take it to someone who has an "Ultra-sonic" cleaning machine. This machine uses carb cleaner and ultrasonic vibrations to get the very small passageways clean when traditional methods fail.


 


 


Here is where you can get an inexpensive "Ultrasonic Cleaning Machine"


http://www.harborfreight.com/catalogsearch/result?category=&q=ultrasonic+cleaner


 


If you don't feel comfortable with this kind of repair I would suggest sending it to a reputable shop.


 


Feel free to contact me here at this question anytime ...even after you hit the "ACCEPT" button ...and I will try to help further.


 



 

JACUSTOMER-u24zgjtr- :

I have pulld the fuel bowl off and the bowl is full of fuel. Are you saying thet the bowl nut is full of crude and the bowl nut will not let enough fuel go through the ventura or fuel tube

JACUSTOMER-u24zgjtr- :

hello

Customer:

It is one of the possibilities along with rest of the paqssages in the carburetor that may be restricted and plugged.

Customer:

If there is fuel in the bowl, that does not mean that itis getting through the passages and into the engine.

JACUSTOMER-u24zgjtr- :

Ok so I also need to go to sears Craftsman and get a need and also try and clean the other ports, I only see two. then maybe my carb will work correctly, or I may need a ultra sonic cleaner. Wow they have been changeing things drastically since I was a kid working on them. Ok I will try it. Thanks

JACUSTOMER-u24zgjtr- :

I may need a carb kit as well.

Customer:

You need a COMPLETE carburetor repair kit. It doesn't have to be from sears but any good mower repair shop should have these. Make sure that you take the COMPETE model and serial number of the ENGIEN with you.

Customer:

Here is a Carburetor rebuild process.


 


First make sure that you have the correct complete carburetor repair kit.


 


Now take special care when you take the carburetor apart..to make sure that you watch and remember exactly how the gaskets come off.


 


Remove the float pin ...it just pushes out...and remove the float..carefully.. so you can see how the float needle is attached...(Some of them have a small wire spring holding it to the float....you will have to reinstall this spring when you reassemble the carburetor.


Remove the float needle


Next...remove the float valve seat. . Look around the carburetor and see if it has a small idle adjustment needle...remove this needle if it has one. You are now done disassembling the carb. DO not take anything else out of the carb.


 


Get a good carburetor cleaner....preferably with a small hose you can attach to the nozzle of the can. Spray the carb cleaner all over the outside of the carburetor. this will loosen the dirt on the outside while you clean the inside. Now spray the cleaner through every hole, and nook and cranny you can fine on the inside of the carb.


 


When you are finished with the spray,blow all of the passageway clean with compressed air from an air compressor. Also blow all of the dirt from the outside of the carburetor.


 


Next. Take the entire carburetor to the kitchen sink......Ok maybe it would be better to get a big bowl...so you don't make your wife mad....and wash the entire carburetor with HOT SOAPY dishwater. This is to make sure that all of the carburetor cleaner is completely washed from the carb...(If it is not, you will deform the new gaskets and such that you install...even if it is dry.) Now rinse in clear watter and then blow the carb dry with the compressed air again.


 


Reassemble the carb using the identical parts out of the carb kit as you took out. install the float seat, then install the float needle and the float in the same position that you took them out. Check the float level after it is installed. Making sure that when the carb is upside down with the float in the up position, the float should be nearly level with the body of the carburetor. Now reinstall the bowl gaskets the same as you took them off. Then install the bowl nut with the small gasket under it. Reinstall the small idle needle if it had one.


 


There you are done.


 


Install the carburetor on the engine and you should be ready to go.


 



 



 

JACUSTOMER-u24zgjtr- :

thanks I was on the right track and just need to go alittle further and also I do not see a smaell idale screw, But will look for other ports and such one was clean and there was a small one beside it but it didnot look like it was being used. Although it may just need to be cleaned out. Thanks again I will see if it works.

JACUSTOMER-u24zgjtr- :

Bye

JACUSTOMER-u24zgjtr- :

so is this a one time payment thing or is this a monthly fee charge or i need to unsubscribe.

Customer:

This should be a one-time fee. IF you want to subsribe you are free to do that, but you do not need to subscribe if you do not want to. Just hit the ACCEPT button for me to be paid. There might be a pop-up that asks you if you want to leave a bous or tip and they also may ask you if you want to subscribe, but you don't have to.

JACUSTOMER-u24zgjtr- :

thanks bye

Customer:

Thanks

Customer:

 


JACUSTOMER-u24zgjtr- :

I will

Ranwell1, Small Engine Technician
Category: Small Engine
Satisfied Customers: 10085
Experience: I Own a Lawn Mower Sales and service business (37years). Have 2-cycle and 4-cycle certification.
Ranwell1 and 7 other Small Engine Specialists are ready to help you
Expert:  Ranwell1 replied 3 years ago.
Thanks

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