Reply To: Wisconsin M RBM poppet valve carb

[Buccaneer]

Joe, that sounds like a real challenge indicating your poppet valve on the lathe.
Had I got the carb off the cylinder, I might have tried to ream out the valve guide
in the milling machine, but there’s nothing “square’ on that carb, and don’t
have any idea “how’ I would have mounted it.
All said and done, I think the guide I made worked okay.

I was gone most of the day, but managed to drill the hole in the poppet valve stem
in the milling machine, but every thing else was done on the lathe.

Not sure if it was an original feature on the Wisconsin, or other brand poppet valves,
but besides the spring inside the poppet valve body, there was a small exterior spring
on the bottom of the stem that extends from the bottom…. hence the small cotter key
hole to hold the spring in place.
I’ll have to look at some “file” photos of Wisconsin’s and see if they have a bottom spring.

I installed the main, internal spring, and the poppet valve dances nice when the engine is
spun over.

If I get a chance tomorrow, as long as the tank is off the engine, I’m going to be sure
it’s free of any “crud” inside, then try to make a brass screen that goes inside of the
tank, vertically from the bottom 1/8″ pipe plug drain.

Prepare to be boarded!