Hi, can anybody tell me the maximum safe advance timing for the volvo penta AQ130C ?. The manual says set to 27deg to 29deg advance at 2000rpm which we have done. Using a strobescope on the pulley we are reading 38deg !. (12 deg at idle) The distributor is a Bosch with centrifugal advance. There appears to be no tension on the thicker spring, so the weights are going fully out. Is this normal, or shoudld there be some resistance to limit the total amount of advance at higher revs. Thanks in advance. Mike