Rotax 912 ignition issues

[wypaul 448]

Is there a new owner on here from St George having ignition issues?

[wypaul 448]

I noticed a post of a new owner on Rotax Owner with starting issues and a few years back I experienced some worth noting. This happened on a trip to Idaho after fueling and running on 100 LL.  ABOUT THE SECOND FUEL up the 912 would not fire at all. Finally changed out the plugs and it fired right up.  The fellow with me fueled at all the same places had no issues at all. The next time I stopped same issue. Running short of spare plug I found I could change one plug and the engine would start and run just fine.  Once I returned home and running on auto fuel, 91 alcohol free, no more issues.  To this day I do not know what was the cause but suspect some chemical related issue with the lead in the combustion chamber related to temperature of the burn.  Anybody else ever have this issue. I was not running Iridium plugs at the time.