Re: 72 Johnson 125 , no spark
Does sound like a blown pack, but no worries. <br /><br />OK, first of all, if you continue to run powerpacks (sensor or points-based), they may blow if you have flaky (intermittent) connections in the cables to the battery, or in the wiring of the boat. Same with running a 'small' battery. There is no voltage regulator on these systems, so spikes are eaten up by a big fat-assed battery (by design). If one runs a battery just big enough to confidently run the starter motor, you cook the big bucks powerpack. BTW, the powerpack WILL blow, immediately, if you hook the battery up backwards.<br /><br />OK, we got that out of the way. Good used sensor-based powerpacks run $75 to $125 on eBay. If you want something a little less iffy, I highly recommend CDI/Rapair as a source for a replacement pack. It's difficult to speak definitively, but the general tilt of the conversation here is that CDI has learned from the burnouts they receive, & builds a stronger pack than OEM (plus it's cheaper). I think around $200, if you can't find it for that online give a shout.<br /><br />I'd note, also, that points-based ignitions were fitted to the 'cheaper' V4s in your time span (1969-72) and will bolt to your motor. Specifically, you 125 crank will have a cam to run a 'points-style' ignition. I'll refer you to searches of the archives to look at various alternative based on that route. Again, if you get stuck, give a holler.
