Several here have 18s...great boats and very much like the V20... 
 
The 115 will be OK as long as you don't overload...extra weight will catch up w/a lack of power really quick...like said above, 150 is a better choice on a V20...seatrial the boat if you can and see for yourself...take two BIG GUYS  w/you...
		 
		
		
		
		
		
		
			
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				'74 V-20/ BF 150 
'95 V-21/ BF 150 
'84 V-20/ 200 2.4 Merc 
'87 V-20/'18 F150 Yamaha
  
			 
		
		
		
		
		
	
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