Removal and Rebuild Carburetor

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  #1  
Old 03-10-05, 10:52 AM
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Removal and Rebuild Carburetor

I have a Snapper self propelled with a 6.0 B&S Quantum XM engine. Only two years old but can not crank it. It will run for a few seconds then die. I have inspected and cleaned paper air breather and foam filter (did not oil). I have replaced the fuel filter. I have inspected the spark plug, cleaned and re-gapped it to .30. It still will not run. So according to the B&S manual that I have the next thing is to rebuild the carburetor. I have never done this. The manual "Small Engine Care and Repair" is of course somewhat generic, i.e. it speaks of idle adjustments when my engine does not have such. No throttle adjustment it runs at a constant speed (when it's running). I am a little tenetive about trying to remove and install this kit. I want to be able to do this myself and also save the 60.00 I would have to pay to have it done for me, but guess I am overly cautious. Do you folks think that I should follow the general instructions in this manual with some confidence that they will be reasonably accurate or does anyone have any advice? Would appreciate any advice or references.

Thanks,

luggage
 
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Old 03-10-05, 11:51 AM
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Actually, that manual you have is a good book and details quite well carburetor servicing. I sell many a year at my shop and think they're valuable. The most important thing with servicing carburetors is to soak them in a quality bath type cleaner (I like Napa #6401) as spray cleaners aren't much good on heavily varnished carbs. Don't concern yourself with removing any of the welch plugs though if you have no experience...you can easily damage the carb if done improperly. Here's what you do: Post back with the engine ID#'s, remove the carb, remove all plastic and rubber pieces (including the inlet seat), soak the bare carb in the above cleaner for 15 minutes (this solution is very caustic...use protective eyewear and rubber gloves), install the correct genuine carb kit and away you go. Note that if you want a more detailed service book, purchase a Briggs service manual specific to your engine series...you'll need to post back with ID #'s so I can give you all pertinent numbers (parts and manual).
 
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Old 03-10-05, 12:07 PM
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Removal and Rebuild Carburetor

Thanks for responding so quickly. I'll give you all that I have. B&S Quantum XM 6.0, Model 12802 Type 1987-B1 Code 01022357 Family YBSX.1901VC
274466. I am told by the Snapper dealer that there are not any idle adjustment screws. It stays at one speed all the time. So far when it is running it seem to have enough power. I just never had a mower that did not have a throttle adjustment.

Thanks again,

luggage
 
  #4  
Old 03-10-05, 12:34 PM
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You're missing one digit in the model #, post back as this is an important number. All newer carbs, whether walk-mower, riding-mower, trimmer, etc. are non-adjustable. This is so that they meet EPA emissions regs. As far as the fixed throttle is concerned, I've seen more and more come through my shop as such. Seems senseless to me. There is a "tab" which you can bend up on the speed control and then install a remote throttle control making it adjustable...not a bad job to do at all. Look closely at the speed control and you should figure it out.
 
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Old 03-10-05, 01:13 PM
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Removal and Rebuild Carburetor

Sorry about that. The complete number is 12H802

Thanks

luggage
 
  #6  
Old 03-10-05, 01:33 PM
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Carburetor kit # - 498260, manual # - 270962. Check with your local Briggs & Stratton dealer for these. I suggest a Murray "fits-all" throttle control, part # 420005 or similar if you plan on making a adjustable throttle.
 
  #7  
Old 03-11-05, 06:46 AM
Azis
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Just an idea, u may be able to verify if the carb is the problem or not b4 kitting it. Your description of the problem only says it starts but will not stay running. Try starting it then nursing it with a few drops of gas into the carb, if it tries or continues to run, this would verify a fuel problem and kitting or cleaning the carb would be a correct step in solving it. If it does not contunue to run or try to, then you may have other issues.
I bring this up becuz I have a Honda rider in my shop that the customer had the exact same complaint on. I have been unable to get it to start at all. I traced it to an intermitten/weak coil.
It is possible for safety switches to also cause these symptoms.

Also, many of the newer carbs have plastic parts, some of which I have seen are not meant to be removed. The carb cleaner puey mentions is AWESOME stuff but will destroy plastic, rubber, skin.... If your carb has plastic parts or fittings, I would not recomend soaking it in this cleaner. Remove as many metal parts as you can and soak them, then use spray cleaner on the rest of it.
 
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