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The needle valve can't adjust for over boost. The Dawes valve does that. Just undo the Dawes valve lock nut and open the valve about one quarter turn (lengthen the Dawes valve). This will reduce the spring pressure on the ball valve and the boost will level out before it goes to over boost. Don't forget to re tighten the lock nut. All engines seem to go into over boost at slightly different pressures. 12 PSI seems a bit low but how accurate is your gauge? Don't worry too much about the actual numbers. Just get it going right first and fine tune from there.
Last edited by BillsGU; 17th February 2014 at 08:11 AM.
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