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Gotdang Intake leak

Started by PJultra, September 13, 2020, 02:03:42 PM

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JW113

The only things exposed at idle should be the idle jet hole, which is closest to the exit of the carb, and just the end of the first transfer port, which should be just under the edge of the throttle plate. If all exposed, you have essentially lost all idle mix control, as the transfer ports are feeding fuel to the engine. So I am assuming you need to turn the idle speed screw on the throttle level that far to get the bike to idle at 1000rpm, yes?

Again, what cam are you using?

-JW
2004 FLHRS   1977 FLH Shovelhead  1992 FLSTC
1945 Indian Chief   1978 XL Bobber

PJultra

Quote from: JW113 on September 18, 2020, 08:32:18 AM
The only things exposed at idle should be the idle jet hole, which is closest to the exit of the carb, and just the end of the first transfer port, which should be just under the edge of the throttle plate. If all exposed, you have essentially lost all idle mix control, as the transfer ports are feeding fuel to the engine. So I am assuming you need to turn the idle speed screw on the throttle level that far to get the bike to idle at 1000rpm, yes?

Again, what cam are you using?

-JW

Yes, I do have to turn the idle speed screw in farther to get it to idle.
The cam is the EV-13. And as a reminder, this was an EFI bike. The only other mods are the 2 into 1 exhaust and a stage 1 air cleaner.
98 Ultra Classic  FLHTCU<br />78 Low Rider FXS

JW113

Got it. EV-13 should not cause enough intake backflow of any concern. Something else is amiss.

What intake manifold are you using with this carburetor?

-JW
2004 FLHRS   1977 FLH Shovelhead  1992 FLSTC
1945 Indian Chief   1978 XL Bobber

PJultra

Quote from: JW113 on September 18, 2020, 02:03:32 PM
Got it. EV-13 should not cause enough intake backflow of any concern. Something else is amiss.

What intake manifold are you using with this carburetor?

-JW

P/N 27019-89
98 Ultra Classic  FLHTCU<br />78 Low Rider FXS

Deye76

September 19, 2020, 05:41:04 AM #29 Last Edit: September 19, 2020, 05:58:48 AM by Deye76
That part # listed for a 84-86 model? Yours is 98? Might be your problem. Of course can't believe everything on the internet. :nix:
East Tenn.<br /> 2020 Lowrider S Touring, 2014 CVO RK,  1992 FXRP

Hossamania

Same intake # for '98, with an "A" suffix, according to Ronnies.
If the government gives you everything you want,
it can take away everything you have.

Burnout

I think a 98 may have had a MAP sensor on the intake? That would be the difference.
They don't call me Ironhead Rick just because I'm "hard headed"

Hossamania

If the government gives you everything you want,
it can take away everything you have.