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Unread 05-31-2013, 07:26 PM   #286
Matt1981CJ7
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Yes, it appears Extreme is saddled by a computer-era 7 degree centrifugal advance slot. Without the computer, that's just not enough.

An 18 degree head would help a bunch.

The vac advance canister does sound like it's a little wonky, but I wouldn't worry about that until the centrifugal is dialed in.

Matt

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Unread 05-31-2013, 07:55 PM   #287
2Xtreme
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Note sure I can get the idle any lower without pulling the carb and futzing with the secondary idle screw. The idle speed screw is backed all the way out and not making contact....
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Unread 05-31-2013, 08:01 PM   #288
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I'm not familiar with the "secondary idle screw" on a Holley.

What's that?

Matt
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Unread 05-31-2013, 08:08 PM   #289
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Quote:
Originally Posted by 2Xtreme View Post
Note sure I can get the idle any lower without pulling the carb and futzing with the secondary idle screw. The idle speed screw is backed all the way out and not making contact....
Unfortunately, that's the next, logical step. I know, I know...


Shawn
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Unread 05-31-2013, 08:16 PM   #290
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Whelp, it is what it is....

Is the carb gasket reusable?
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Unread 05-31-2013, 08:53 PM   #291
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Yeah, more often than not unless it's been on there awhile. Snap a few pics of the bottom side of the carb if you have the chance.


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Unread 05-31-2013, 09:02 PM   #292
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Ok...,

Any idea which way to turn it. CW/ CCW?
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Unread 05-31-2013, 10:34 PM   #293
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I think the vacuum canister adjustment is 1/8 inch. Counter clockwise I think will stiffen up the spring and cause less advance.

I agree taking the rpm to 3000 to see what its going to end up at. Incase 16 @ 2000 is not where it's done.

If that carb has the factory 51 in the primary jet it down to 48 to 45 and blow the carbon out of it. Then get more aggressive on the advance curve.

A water mist or combustion chamber cleaner would not hurt.
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Unread 06-01-2013, 06:55 AM   #294
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Quote:
Originally Posted by Matt1981CJ7 View Post
I'm not familiar with the "secondary idle screw" on a Holley.

What's that?

Matt
I can't seem to download the pic from the Holley site.

Here's a link to the PDF. The pics are on page 4.
Sorry I couldn't post the pic directly....
http://http://www.holley.com/data/Pr...10016-2rev.pdf
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Unread 06-01-2013, 08:35 AM   #295
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Your link doesn't work for me.

No matter, I take it the Holley has some sort of throttle stop screw on the bottom, correct?

I hope it's as easy as that.

Matt
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Unread 06-01-2013, 08:44 AM   #296
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Quote:
Originally Posted by Matt1981CJ7 View Post
Your link doesn't work for me.

No matter, I take it the Holley has some sort of throttle stop screw on the bottom, correct?

I hope it's as easy as that.

Matt
Correct.... According to the manual.

Should just be a matter of pe
Lulling the carb, then backing that screw out.
Going to try 2full turns if its long enough.

Then start over w idle/ timing/ charting.

Off to garage now.....
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Unread 06-01-2013, 09:03 AM   #297
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WAIT!

Don't just throw a few turns at it. Back it out until the plate fully closes and go back in a quarter-turn and see how it looks compared to the primary. Please post up some pics before you re-install it.


Shawn

Edit: A pic of how it is right now would be great! Don't touch anything. Just flip it upside down and take a couple of pics that show both the primary and secondary plates. Pretty please
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Unread 06-01-2013, 10:16 AM   #298
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Here's a pic of how it was when I started. Not sure what you want to see, but I hope this shows it. Right now it's 1 full turn from where I started, so putting it back and starting over is no prob.

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Unread 06-01-2013, 10:29 AM   #299
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Something like this, if you're able to. Both primary and secondary

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Unread 06-01-2013, 11:12 AM   #300
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Ok.... Here it is.
Turns out it only took a little more than1/4 turn from where I started to close the secondaries. The I backed the screw out 1/4 turn.

I don't see anywhere to close up the primaries any further than they already are.

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