KE4AVB wrote:Michael, You have to understand Not all us have been on small engines as long as you probably have. I for one don't these like the back of my hand which is why I equipment to look-up things. And even on this they mention the use of a 3 qt tank; though, it was limited to special cases.
Personally I always prefer to look up IPLs first before responding just I know generally what I am posting is correct. IN this case the 296591 superseded to 397789 is definitely NLA as new so NOS or used is the only options.
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I don't think he has been at it any longer than you have been, However, he does kinda specialize in those particular engines.
The thing is - most of the 3 HP would use the same base carburetor (Carburetors actually - the 3 main types Vacu Jet Pulsa Jet and Float would be all the same base configuration to their particular design) with the variations being based on what tank size they sat on and governor types, choke types etc. Likewise for the 5 HP models.... In later years Briggs just consolidated them to the base carburetor plus components needed for the deepest tank - to use in smaller tanks, one would cut down the brass pickup tube that the nylon tube is attached to, and in some cases transfer over linkages from old to new, so eventually Briggs superseded everything to just one main part number that covered like 75% of all cases . The 3 HP versions were the first to go obsolete, followed a few years after by the 5 HP versions. The Vacu-Jet ones were already going into obsolecence way back in the 1980's but you could replace them with tank & Carb assembly that used pulsa-jet.
So pretty much any 3 HP Pulsa Jet carburetor can be adapted to most of the engines (Though the small tank ones you'd have to replace the brass pickup tube to fit to a larger tank, and that is not an easy job at all, and in many cases just about impossible without ruining the carburetor body) Likewise with the 5 HP - And though you can fit up either size carburetor to a 3 HP or a 5 HP, the venturi would be wrong , hence the specification for 3 HP versions and 5 HP versions.
All that said, I don't think I have seen one with the pull-out choke in the last 15 years or so - the somewhat newer ones could be made to work, but they'd have the nylon/brass butterfly choke, so would never pass as "Original" (and some applications, they would never fit right to begin with), and even those are also obsoleted, AFAIK.
How poor are they who have not patience. What wound did ever heal, but by degrees? - Iago (Othello Act II, Scene 3)