Reply To: Wisconsin M RBM poppet valve carb

[Buccaneer]

HARRY D. NICHOLSON wrote:

If your new valve is heavier than an original valve, it may cause trouble. If there is a spring that holds the valve down on its seat, like in ruddertwins, it may be a replacement, try leaving the spring out.

Harry, thanks for the tip. I had a passing thought the other day about
the weight of the new poppet valve. There’s a digital food scale around
(last used for weighing grout to mix up!) that I could check for kicks.
The spring on the old poppet valve is from an Elto Ace, I used to
replace the non – original, sad looking spring that was in it.

One can observe the bottom of the valve stem to see if it “bounces”
when the flywheel is rocked, so when I get it back together, that
will be my first test.

Prepare to be boarded!