>> Stay informed about: 150 Mercury Black Max Timing Specs
Does anyone know the timing specs for a 150 Black Max Serial number OB155414. I can't figure out if this is an 87 or 88 year model. My Seloc manual shows different specs for these two years. I think it may be an '88 model because it has the WH-40 carbs, just not sure. Can't seem to run this particular serial number down on the net. As you can see by the numbers below, I think it would be critical to know the correct timing specs for this motor. Any help would be appreciated.
1987 150XR2 11* ATDC - Throttle Primary Set At Cranking Speed
20* BTDC - Max Timing
1988 150XR2 22* ATDC - Throttle Primary Set At Cranking Speed
24* BTDC - Max Timing
Timing marks on flywheel
.462 24*BTDC - 16*ATDC