Can you show a picture of the valve? I want to make sure we are talking about the same thing. I thought pin pushed in occurs when throttle is pressed on. Easing off of throttle would allow pin to go back out, restricting flow.

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1962 220Sb ~ The Emerald Bullet http://www.youtube.com/watch?v=hx6tN1W48_o
1957 Ponton 220S
2001 S600 Daily Driver
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