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Briggs 18 Hp Carbs Difference ?


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#1 jakeandsears OFFLINE  

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Posted March 09, 2013 - 09:00 PM

i got these two carbs off vert shaft 18 's for an project can anyone tell me the difference

2013-03-09 15.32.58.jpg

2013-03-09 15.33.14.jpg

2013-03-09 15.33.27.jpg  



#2 jakeandsears OFFLINE  

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Posted March 09, 2013 - 09:01 PM

im assuming different models? 



#3 Bmerf ONLINE  

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Posted March 09, 2013 - 09:20 PM

The silver one appears to be a newer "nonadjustable" type. The black one is older and can be adjusted, internally probably not much difference. Clean and use the black one. IMO


Edited by Bmerf, March 09, 2013 - 09:20 PM.

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#4 jakeandsears OFFLINE  

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Posted March 09, 2013 - 09:30 PM

uggg! i was hoping to use both thanks! i seen another type that had a weird solenoid with wires on it ??



#5 EricFromPa ONLINE  

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Posted March 10, 2013 - 03:06 AM

i seen another type that had a weird solenoid with wires on it ??

 

Ya that would be the silver one that you have.It would be equipped with a fuel cutout solenoid in place of the drain plug on yours.The main jet is accessible if you take the plug out.

 

Both of your carbs are good but I would also use the black one.Just because you can fine tune it and get a perfect running and idling twin.Some of the twins just don't like to idle good and run WOT without sputtering.With a fully adjustable carb you can tune it to run perfectly smooth.


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#6 superaben OFFLINE  

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Posted March 10, 2013 - 07:13 AM

Use the adjustable one.  I have rebuilt more twin carburetors than I can count, and its a 50/50 toss up that the nonadjustable one will idle well until it has run for three hours.

 

The adjustable carburetor was a great design.  Maybe not economical on fuel, but if it is tuned up perfectly the engine should start in a snap even on the coldest day.

 

Ben W.


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#7 EricFromPa ONLINE  

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Posted March 10, 2013 - 06:35 PM

You can get the newer non adjustable twin carb to run and idle perfectly if you ream out the jet a bit with a torch tip cleaner.But it will run a bit on the rich side if you run a cold plug,but it will start very easy and idle down till it will chug,chug,chug.

 

They purposely used a jet that is a bit on the small side to keep fuel consumption down.If you open up the jet a bit they will burn through fuel almost as bad as the old Kohler M18 does.


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#8 jakeandsears OFFLINE  

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Posted March 10, 2013 - 08:33 PM

My idea is a twin carb system on my onan sounds like a nightmare i know but it just might learn me somthing

#9 Bmerf ONLINE  

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Posted March 10, 2013 - 10:38 PM

Twin carbs? Then you need to use two smaller carbs. Each of these was designed to supply ALL the fuel your motor needs. If you use one on each side, you will effectively deliver twice the fuel needed per side. Not a good idea.



#10 jakeandsears OFFLINE  

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Posted March 11, 2013 - 06:05 AM

I was hopeing to jet them down




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