mpt
Contributing Member
I own a 1981 Bayliner 3270 powered with twin Volvo Penta BB140A's. Both motors have Pertronix that I installed over 12 years ago. Both run great with the Pertronix! Yesterday I was checking the timing on both engines starting with the starboard. Timing was around 11 BTDC which I lowered to 8BTDC to meet factory specs at 900 RPM on idle after warm up. When I started to check the timing on the port engine, I noticed the mark flashing up and down a couple degrees from the timing notch on the fly wheel! I adjusted it close to 8 degrees BTDC to match starboard engine. Over the years, the port engine always ran the smoothest of the two, even when I checked it with the timing light it was doing the same erratic flashing and not steady like the starboard engine timing mark! So questions are- could it be the Pertronix? Coil? Timing Cog belt? Even though port engine runs smooth!