Hi all... i have a 1991 evinrude 175hp crossflow which i just changed the voltage regulator on and now the engine severely backfires and wont start..I had to remove the flywheel to change regulator and my manual says that the shaft should be keyed but mine isnt? so does the position of the flywheel matter or is there anything else that could cause the timing to be that far out? I also changed one of the flywheel magnets while i had it off as the magnet had moved and was touching one of the other magnets... any help would be much appreciated...thanks