mmaleney Posted July 8, 2013 Share #1 Posted July 8, 2013 Hi all, I would like to know how the pilot jets are sized, as in if the stock size on a mark ll is 37.5 is the next size up 38 ? 38.5 ?, and also how many sizes is the mark l at 42.5 bigger than the mark ll thanks Mike. Link to comment Share on other sites More sharing options...
mmaleney Posted July 9, 2013 Author Share #2 Posted July 9, 2013 someone Link to comment Share on other sites More sharing options...
dacheedah Posted July 9, 2013 Share #3 Posted July 9, 2013 Try Earl "skydoc" he is very knowledgable about carbs Link to comment Share on other sites More sharing options...
Scudrunner Posted July 16, 2013 Share #4 Posted July 16, 2013 Sorry I can't answer your questions regarding the actual sizes of the jets. I too tried to find the info on the mikuni website but didn't have any luck. At first I thought they related to mm to decimal sizes but couldn't prove that either. Maybe someone that has a few different size jets laying around and the ability to accurately measure the holes with pin gauges can tell us. Link to comment Share on other sites More sharing options...
MiCarl Posted July 16, 2013 Share #5 Posted July 16, 2013 In school they taught us that Mikuni sizes their jets by flow rate rather than orifice diameter. I don't know what increments they produce or any cross reference to determine actual or relative rates. I just know that larger number means more flow. Link to comment Share on other sites More sharing options...
dacheedah Posted July 16, 2013 Share #6 Posted July 16, 2013 Might find info here http://venturerider.org/forum/showthread.php?t=79608 Link to comment Share on other sites More sharing options...
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