I'll do some oil sniffing.  Probably should change the fuel water separator filter to be sure it's not water (the tank is full so shouldn't be condensing moisture).  I wouldn't think it would start and run great for 20 minutes if the carb was clogged up - this is the second time it's done this.  Was leaning toward ignition since it's the only thing that's changed but will work the fuel issues first. 
 
Thanks
		 
		
		
		
		
		
		
			
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				 Scott, Portland, OR '85 V-20 I/O, Merc 170
			  
		
		
		
		
		
	
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