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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #11  
Old 4 Days Ago
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the rough finish improves fuel atomization the way i understand it.yosimura was improving atomization back in the 70's when he changed the shape of the needle in the mikunis.
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RicThompson RicThompson is offline
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On your aluminum intake if you do anything to it check transition from carb to intake is same size, alignment to heads for good seal and airflow. Many have already alluded to finish inside manifold. If there are rough casting clean it up. Based on current data the ports with the best flow numbers are a modified D port with part polish part textured runner. FLow bench and $$$. How fast do you want to be?
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