I ordered for free on the internet from Mercury Marine their latest brochure for 2006 and there were not any carbureted engines listed..The only two strokes are the optimax 2 stage direct fuel injected..75HP thru 225HP.....2.5HP single cylinder pushrod 4 stroke...sounds silly...
I have even heard talk that Merc might be having problems with the Orbital injection license and royality payments. It is the same system that Tohatusu/Nissan are using. Could it be that Mercury will follow Suzuki and Honda in just building 4 stroke engines? It will an interesting year for the 2006-2008 models and what survives with the enviromental requirments. Some of the Opti-Max engines do not meet the Calif Carb ratings.