Some further updates.
The Ghost has had some ups and downs. Once out in the real cold and snow, it took a complete retune of the high/low carb settings. I found it had a high end bog as well as it revved out very fast but fell flat at around 30mph. Also it had a nasty vibration that was RPM dependent. The retune cleared up most of the vibration but didn't fix the speed problem.
Further reading led me to the clutch. It's possible th2 clutch had never been touched. The belt was in great shape and still within width limits.
I clamped the sheaves together and unbolted the retainer. The thing came apart easy. [censored] it was harder to remove the belt. It was filthy, lots of belt dust and grime. I degreased everything, deglazed the sheaves (not bad actually) and used a bit of grease on the sliding splines. What I got was a whole new sled. Vibration was all but gone and she was back to hauling [censored]!!
The Evinrude still runs like an absolute beast. Other than deglazing the sheaves, new plugs, belt and some hard runs, it is great! I plan on doing the primary clutch this spring, when time permits. I had her out for a rip with a friend the other weak, ended up doing several long full power runs through deep powder on the lake. She was throwing some serious heat yet never faultered under load or idle. It runs like it was new.
The other plan is to get some new primers installed. With a small prime down the carb throat, they will fire on first or second pull in -35C.
Put only 30 miles on each sled, not much but still, the kids and I are really enjoying them.