Reply To: Wisconsin M RBM poppet valve carb

[PM T2]

Well, thats a new one to me. Usually the phosphor bronze mixer body is harder than the brass poppet valve, and its the stem that wears, not the bore it sits in. Normally, with knowing what you’re saying, I’d have to suggest that somebody already replaced the poppet valve, but who really knows…..

Best I can suggest is if you need to repair the condition of the stem bore, make a tool guide that fits down and locates on the existing poppet valve seat, and hand ream the hole to the next nominal size. Obviously you don’t want to remove a lot of metal in doing so, thus it may be required that you buy a special size reamer that you might only use once in your life (a lot of my tools fit that description, it goes with the territory). MOst valve stems I see are 3/16″ (0.1875″) so if yours matches up with that, then reaming buying a decimal size reamer and carving it out to 0.200″ is not out of the question.

I make poppet valves out of standard 360 yellow brass, and in one piece. Most common seat angle I see is 30 degrees.

Hope it helps.

Best,
PM T2

He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...