OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines Briggs & Stratton Carby Questions

Hi

I tend to keep a reasonably detailed log of my machines, and i have forund a gap when trying to add briggs and stratton mowers to my records (only started working on them recently)

I have a section that lists details on the carburettor, and for a victa i would put, for example Make: Victa, Model: G3, for Walbro the model may be WA63 and so on.

With the Briggs carby's, is there a model number beyond the model name (I.E. Pulsa Jet, Vacu Jet, Etc.) i have read reference to a pulsa jet 13, but no other numbers have ever come to my attention.

Are there different models of each type, and if so, how do you tell whats what?

Ty, the B&S model number only tells you the generic type of carburetor: Vacu-Jet, Pulsa-Jet or Flo-Jet. The design generation, immediately after the engine size in the model number, gives a good idea of the specifics of the carburetor but to be more precise you can use the engine's type number (second series of numbers, after the model number). Go to this site, and enter both the model number and type number:

http://www.briggsandstratton.com/engines/support/operators-manuals/

That will give you the illustrated parts list and the operator's manual for the particular engine you are looking at. The illustrations show the carburetor (and other parts), and you can verify them by checking them against the actual engine.

Thanyou Grumpy!!!

One last thing, is there charts anywhere to help decode that type number, i know its more obscure than the other numbers, but if its not to hard, i wouldnt mind knowing what it means.

I haven't found an explanation of the type number, Ty. If you find one, please post the URL. (I currently suspect they are more or less bureaucratically assigned rather than making objective sense.)

Ah, i see, well if i ever do i will make sure to put it up, but if thats the case, then it may not be so easy to work them out.

Yep, i cant find a thing out there about it, apart from

'the type number lists the specific carburettor, muffler, mechanics, govenor settings, etc. as well as the paint, decals and any specifics the machenary company that originally ordered the engine requested'

the only further detail i can get is that the last 2 digits (or letter) seperated after the space, are the trim number, for the decals & colour & such.

Best i can tell the carbs are fairly interchangeable.

Different engines definately have the different types.


Ive noticed that the 4HP have a steel main jet and the the 3.5's have a brass one. Not sure if this is fact or just an impression i got.

I had one with a badly scored needle the other day, and searching through the spare ones i had they all appear to be the same profile.
Nothing makes a rough runnning motor like a needle with a big croove around it from being bottomed out way to hard into the jet.


Short of model and type and checking part numbers theres no way to tell what parts are the same.

A sure bet is, get a tank/carb off a 4Hp and write that on it in marker. Clean it out new diaphragm etc, test it and its a known good carb.
Do the same for a 3.5HP. (not sure if you would need one for a 3Hp as well)
Once you take it off a motor it should be within a bulls roar of being right on the next one should you suspect carb issues.

At $15 a throw i dont like to put new diaphragms in every carb. Clean them out and back together, got caught out the other day with one that looked ok but it wasnt. Holy crap, had no muffler on the the thing, just a lang 1/2 gal elbow. Pumpin black soot, shootin flame and the backfires. Awesome stuff.

I'm finding them fairly easy to get the hang of, i have a number of briggs now, and to be honest, a new air filter & spark plug, a good carby & tank flush, and some fresh oil and fuel seems to be all for alot of them want.

Just servicing, not repairs as such.

i have Brigs engines from 73, 75, 77, 80, 81, 89, 98 & 03, so i am getting a reasonable cross section.