Author Topic: High idle with pods/straight pipes...  (Read 1936 times)

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Offline Lumbee

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High idle with pods/straight pipes...
« on: November 08, 2005, 06:46:07 AM »
...sup all...I'm running pods and straight pipes and I can't seem to get my idle down...I've tryed turing the air/idle screws all the way in and out and it doesn't seem to help.

Where else can I go to adjust the idel...slide adjustment...different slow jet???

...also, the idle thrumb screw is all the way out...and the cables are not tight...
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Offline dusterdude

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Re: High idle with pods/straight pipes...
« Reply #1 on: November 08, 2005, 07:10:45 AM »
sounds like you may be pulling air
mark
1972 k1 750
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1998 cbr600 f3

Offline Lumbee

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Re: High idle with pods/straight pipes...
« Reply #2 on: November 08, 2005, 07:14:49 AM »
"pulling air"...u mean pulling air from a leak around the manifold/carb rubbers?
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Offline dusterdude

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Re: High idle with pods/straight pipes...
« Reply #3 on: November 08, 2005, 08:06:23 AM »
yep
mark
1972 k1 750
1949 fl panhead
1 1/2 gl1100 goldwings
1998 cbr600 f3

Offline scondon

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Re: High idle with pods/straight pipes...
« Reply #4 on: November 08, 2005, 10:39:59 AM »
Did you just put the pods and straight pipes on and then the idle rose, or did you pull the carbs as well? You're running the 77-78 carbs right?

  Besides checking for air leaks you might want to check that the choke arm isn't hanging up. Pull one of the pods and check that the butterfly valves are fully open when the choke nob is pushed in. The accelerator pump puts more gas to the engine when the choke is engaged, raising the idle. Even though you're satisfied that the cables are set properly, you might want to get the engine warm and then disconnect the throttle and choke cables and see if your idle drops. No need to pull them all the way off. just undo the adjuster nuts and slip them out of the mounting brackets.

  I'm not sure how to adjust all the slides on these carbs. #2 doesn't have an adjustment for balancing. 1,3 and 4 are set to match #2 and that's it. I think :-\
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Offline Bodi

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Re: High idle with pods/straight pipes...
« Reply #5 on: November 08, 2005, 11:18:08 AM »
I'll presume you have the later carbs with the linked arm throttle assembly, I think the 4-cable ones were only K0 but not sure.
Check the choke throttle advance cam. There should be an adjuster screw in the mechanism, it can set a false minimum idle. One way to check is to activate the choke a tiny bit, the idle speed should not change for a small choke setting as the "slack" in that idle advance mechanism takes up. If your idle rises with even a miniscule choke setting then I'd have a good look for the adjustment.
The jetting sets the idle mixture, not RPM. You want the 4  carb idle mixtures set for the highest RPM idle you can get and then set the actual idle RPM with the idle speed knob.

Offline Lumbee

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Re: High idle with pods/straight pipes...
« Reply #6 on: November 08, 2005, 11:30:19 AM »
#2 doesn't have an adjustment for balancing. 1,3 and 4 are set to match #2 and that's it. I think :-\

Yes...these are carbs off a 78K...glad u told me that Scondon...I notice the assembly on top of the slide looked a little differnt on the #2 carb.  I thought I was missing some parts or something.  So I'm correct in assuming adjusting the slides has nothing to do with idle?

Bodi, can u elaborate a bit on "You want the 4  carb idle mixtures set for the highest RPM idle you can get and then set the actual idle RPM with the idle speed knob"  ???
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Offline scondon

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Re: High idle with pods/straight pipes...
« Reply #7 on: November 08, 2005, 03:37:58 PM »
I'm sure Bodi's referring to the air/fuel mixture screws pointing straight down in front of each carb bowl. These only effect the idle jets(closed throttle). Manual says to set them at factory spec (1 3/4 turns out in your case) and then turn them out(rich) a 1/4 turn at a time until the idle begins to rise. Keep turning until the idle doesn't rise and then turn back 1/4 turn. Do one carb at a time. I doubt if you'll be able to turn them out enough to work with pods and straight pipes as the slow jets just aren't big enough to provide the fuel necessary. I'd start at 2 1/2 turns out and stop at 3 1/2 turns if no change is noticed.

    What size are your main jets? Just curious.
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Offline Lumbee

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Re: High idle with pods/straight pipes...
« Reply #8 on: November 08, 2005, 07:16:43 PM »
...carbs are stock...so they mains should be 110, and slows 35...
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