So another day of troubleshooting and it looks promising. I pulled the air filter to check the box for clogs and leaks, but found nothing.
So I put the fin back on top without the airfilter and started it up, runs a bit rought with all the air flow. Covered the back fins with my hands about 90% of the opening and bamn, the right cylinder starts firing and I have good revs with no power drop.
So it seems I'm getting too much air. So i'm going to RTV the cracks in airbox between the airbox and the carbs, grab a new filter and see how it goes from there.
