EVO All Evo Model Discussion

Slow jet is too small?

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Old Jun 13, 2012 | 10:26 AM
  #11  
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yes, it doesn't take much (speck) to make it run like crap. good luck.
 
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Old Jun 13, 2012 | 10:29 AM
  #12  
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allow for that the new jet can be faulty... (don't ask me how, maybe one of the seasoned wrenchs on here can tell us) who knows where they're made nowadays. Hell at least they still cheap.
 
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Old Jun 13, 2012 | 12:41 PM
  #13  
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I usually check for the correct size with number drills,
a #78 (.016) should pass through,
a #77 (.018) shouldn't,
.45mm is about .0177.

Just check for size, don't force and booger the hole.
 
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Old Jun 13, 2012 | 01:07 PM
  #14  
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I have a 45 and 180 in my 99 EVO with drag pipes and a K&N air cleaner. Works perfect, so guess you have somethng plugged up, or an air leak.
 
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Old Jun 13, 2012 | 01:54 PM
  #15  
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Last time I was cleaning my carb, took a dinner break, I left it on the workbench with the bowl off and my benchlight on - right above it. A couple of small flys commited hari-kari by flying into the light bulb and dropping dead right into the bowl. I reassembled it and wondered why it ran like crap until I took it apart again and found the dead flys, they were stuck in the highspeed jet in my case...It was kind of funny at the time.,...

DS
 
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Old Jun 14, 2012 | 02:25 PM
  #16  
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Originally Posted by Doug S
Last time I was cleaning my carb, took a dinner break, I left it on the workbench with the bowl off and my benchlight on - right above it. A couple of small flys commited hari-kari by flying into the light bulb and dropping dead right into the bowl. I reassembled it and wondered why it ran like crap until I took it apart again and found the dead flys, they were stuck in the highspeed jet in my case...It was kind of funny at the time.,...

DS
That sounds like a CSI episode!!! Holy crap!!
 
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Old Jun 15, 2012 | 08:40 AM
  #17  
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Didn't have time to check it yesterday, but got a 48 jet just in case! Holly crap: $9 for a jet here in Canada
 
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Old Jun 15, 2012 | 08:50 AM
  #18  
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You either have a vacuum leak, or the slow speed circuit is faulty. It could be as simple as a plugged low speed jet or perhaps one of the passages is plugged.
 
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Old Jun 15, 2012 | 08:55 AM
  #19  
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would vacuum leak manifest itself elsewhere besides 1/8 of the throttle?
 
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Old Jun 16, 2012 | 01:08 AM
  #20  
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I am having pretty much the same problem....I chased around other ignition components and have been looking at the carb too...no luck yet....so far I've just adjusted the AF mixture screw to compensate for the problem but it still just doesn't seem right.

I thought I might have a manifold leak but spraying the area didn't reveal any engine rpm changes.

As far as vacuum leak, are you referring to manifold or to the VOES?

If you nail it, be sure and post your fix.
 
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