190 main jet

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Mar 18, 2010 | 03:22 PM

j404ski

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190 main jet

Does anyone know the drill size & diameter of a 190 main jet in a CV carb? I've got a 165 in mine and it's coughin' and spittin' the carb off.

Mar 18, 2010 | 04:09 PM

Neil74

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That depends what carb your working on. S&S uses decimal, if 98 jet = .098 inches. Japanese 190 would be 1.90mm=.0748 inches. Your regular drill set will sometimes have correct drills, unless in between size. For instance a 3/16 drill = .1875in., and a 13/64 = .2031in. Your wire gauge size drills an 11 = .191in and a 12 = .1890in. If you have drills available use them for a plug fit in your 165. Sorry I can't help more but I know nothing about a CV carb

To convert from metric to decimal 1.90 x .03937= .0748in. to convert in. to metric .0748 divided by .03937 = 1.90mm .03937 being your constant Never noticed no division sign on a keyboard

Last edited by Neil74; Mar 18, 2010 at 04:30 PM.

Mar 19, 2010 | 01:10 PM

j404ski

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thanks Neil!

Mar 19, 2010 | 08:35 PM

78fxs78

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From: Bgosh,WI

Hand drilling isn't real precise anyway, you may want to go a little smaller first, then try it, 190 seems awful big for a CV, OK for a butterfly.

Mar 22, 2010 | 06:38 PM

j404ski

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that's what I've read other guys recommend using for converting to a CV carb on a shovel so I figured I'd try it.

Mar 22, 2010 | 07:45 PM

Neil74

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This link seems to support the 190( .0740) jet, but for a 88 twin cam, I'm not familiar with either the carb or the motor,maybe one of the Harley Mechanics will chime in
https://www.hdforums.com/forum/fuel-...ggestions.html

Last edited by Neil74; Mar 22, 2010 at 07:48 PM.