conversions

Greetings all :) Have done a few Schrader conversions on KTMs and now have the need to do a Husaberg. I understand there is the worry of the valve being destroyed by the chain at full compression- but looking at the chain roller wear marks and the few little nicks on the shock ressy it...

Could any one tell me a bit about the main bearing conversions I have an 03 550 that is running two roller bearings and i would like to know if this has to be changed or if this is the way it should be. I have looked and tried to use the search but have had no luck. Many thanks. cookeye...