carb help

[mmaleney]

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.

[mmaleney]

someone

[dacheedah]

Try Earl "skydoc" he is very knowledgable about carbs

[Scudrunner]

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.

[MiCarl]

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.

[dacheedah]

Might find info here http://venturerider.org/forum/showthread.php?t=79608