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Mikuni Jetting

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jakes73 View Drop Down
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    Posted: 07 Jun 2011 at 10:05pm

 FOR STOCK ENGINES ON DUEL 44 MIKUNIS

 L16,L18,L20B  
 510,610,710,200SX,PICK-UP
 VENTURI LARGE( 34) MAIN FUEL JETS(150) MAIN AIR JETS(250) PILOT JETS(52.5) PUMP NOZZLE (0.45)
 
FOR STOCK ENGINES ON DUEL 40 MIKUNIS;
 VENTURI LARGE(32) MAIN FUEL JETS (135) MAIN AIR JETS (160) PILOT JETS(57.5)PUMP NOZZLE(0.45)


Edited by Braden620 - 09 Jun 2011 at 12:30am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Braden620 Quote  Post ReplyReply Direct Link To This Post Posted: 07 Jun 2011 at 11:29pm

  sorry jake but the 150 mains are way way too big, even for the 2.0 with a high lift stage 3 isky cam it sucked way way way too much fuel, you can adjust the idle mix with the idle screws but when the carbs are off the idle circuit the only ratio you have is the ratio you get when all your jets are combined.  I used 140's and still had a 1/4 inch of carbon stuck in my exhaust, and I got 18mpg!!!!  at any rpm range above 4k the 140s were alot better suited. Of course this all depends on intake air temp, ron rating, timing, altitude, etc.   but definitely on the l16 or l18 I definitely would run anything bigger than the 140's   


if anybody needs any jetting information please call todd walrich at wolf creek racing, give him all your specs and he will send you jets to suit your application.



Edited by Braden620 - 07 Jun 2011 at 11:35pm
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jakes73 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jakes73 Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jun 2011 at 6:15pm
Confusedsorry guys for the wrong info, i was just going with my mikuni jet chart,  and like i was once thought ,listen very good, because they have all tried it once before so ,,,ill take experience anyday over talk. Big smile
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Braden620 Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jun 2011 at 12:26am
lol, jake the tables can get you headed in the right direction, they will get your engine running and then its up to you to use  signs like carbon deposits in your exhaust, afr gauge readout, plug color, throttle response, etc to fine tune your rig. once you get a basline you can jet up or down to your preference. Thanks for the info though, im not sure if the mikuni manual I posted up in tech had any jetting in it or not.  For future reference the 150's would be great for a high lift cam, extremely ported head, overbored, larger valve l20.  I would say that the 150 or even 155 mains would be great for an lz22 project!!!   so as far as your engine it sounds like you have got it covered!   When I did mine I just told tod what I had and where I lived, he set my carbs up for me then he sent a couple different sized main fuel jets so i could jet up or down as needed, todd is a great dude!!!!

Edited by Braden620 - 09 Jun 2011 at 12:29am
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