View Full Version : why are there s header pipes?
400exrider989
12-03-2006, 12:44 PM
if the 400ex is single cylinder then why is there to pipes running on the motor?
thanks
Originally posted by 400exrider989
if the 400ex is single cylinder then why is there to pipes running on the motor?
thanks
It uses 2 small holes instead of 1 big one. I dont think theirs a reason.
400exrider989
12-03-2006, 12:57 PM
ok thanks thats what i thought because i looked at a bore kit and there was only one cylinder so i thought it was twin cylander thanks for responding
440exroost1984
12-03-2006, 04:30 PM
It has to do with the design of the 400ex engine. Simply it has to exhaust ports.
wilkin250r
12-03-2006, 04:34 PM
Multiple small exhaust ports are often easier than one single large port. The increased port area will improve top-end performance, allowing the engine to breath better and allow it to rev higher.
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