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		The only modification I made to the base of my air cleaner was cut about 1/4" off the lip that fits on top of the carb.  I'm speaking to an installation in to a Factory Five, which, may be different than a Backdraft or West Coast.  IF you stick with the stock 'crate' engine specs without getting too extreme, I think the 850 double pumper will over feed the engine....it did mine and one of the reasons I stepped back to a 750.  Also, no choke...I'm in Missouri, and have never had trouble starting mine without a choke.  More headaches in my opinion as I used to have an electric choke, but removed it after it got stuck on me a few times. 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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