Ignition or Carb problem

Just my .02 cents and maybe not everyones:

Bottom line this is your decision.

A lot of things we do boils down to good inspections and maintenance practices and not purposely doing bad things or alterations. 

I know I'm about to comment on not always needing to do the 200 hr. carb inspection and I know it's on the checklist, but this is more of a one off for me. 😁

No, I don't so long as they sync up properly and they are synced every inspection, no leaks, no running issues. Replace the diaphragm at the 5 year rubber change. Now you may skip the 200 hour, but at some point you'll need a carb overhaul like everyone else. If you do the 200 hour your just replacing the "O" rings, checking the float brass armature for its proper measurement (most don't know how to do this) and weighing the floats. At every annual or 100 hr I always weigh the floats now, check the bowl for debris and remove and clean the idle jet. I find about 60% of the idle jets partially or fully clogged so I figure I already have the carb bowl off and the idle jet is right there I might as well take a couple of minutes and clean it. Other than these few items that I do every inspection I don't know anyone that has a clue what to look for at the 200 hour. I've never had anyone with a well kept carb have an issue other than a leak which is usually either the bowl gasket or the needle valve isn't seating properly.

Rotax most likely won't like my answer (hope I don't see a drone over the house with a missle attached 😂), but I'm looking back on 25 years worth of Rotax time and maintenance and experience on hundreds of engines. I see some do the 200 hour and that's all good, but far more that don't. The "O" rings and the such inside the carb isn't always about just run time, but age too. "O" rings over the hours and years can dry out and other parts wear due to vibration.

Now this all said something within the carb could become worn out along the way and cause an issue, but you should know when that happens. This could happen at any time.