Question about 2004 Harley Davidson XL 1200 C Sportster Custom

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2004 XL 1200 C won't pass emmisions, CO too high. Idle mixture screw seems ineffective. cleaned the plugs, turned the mixture screw in a complete turn and got the same numbers back on the second test. It does smell rich while idling, so i tried turning the idle screw in while the bike was warmed up and running, and was able to bottom out the screw without killing the motor, that doesn't seem right.

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No this is not right. I would see what size your pilot jet is , drop a number and try again. Less than one and a half turns out on the adjustment screw usually means your pilot jet is too large

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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1 Answer

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Hi, Anonymous and the usual suspects are:
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Other than adjusting the idle mixture screw the only other thing you can do is change the jets get a high flow air cleaner and performance exhaust.

Dec 26, 2013 | 2005 Harley Davidson XL 1200 C Sportster...

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Hi, Anonymous "WEAKENS" it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
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5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
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8. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
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1 Answer

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Apr 01, 2012 | 2005 Harley Davidson XL 1200 C Sportster...

1 Answer

It seems like my idle is too high for my 04 1200 custom sportty. what should it idle at?


It should idle between 900 and 1000 RPMs when at full operating temp. If it's equipped with a carb, remove the air filter cover. You'll see the square looking top on the carb. Look on the right side, towards the front of the bike, at the top of the carb and you'll see a screw. This is the throttle stop screw. Turn it counterclockwise to slow the idle.

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Apr 20, 2011 | 2004 Harley Davidson XL 1200 C Sportster...

1 Answer

My 2004 1200 V-max has not been started all winter and now its warmed up and it keeps dying and throttles erratically


If carbed drop the bowels & clean out spray cleaner in jets idle mixture screw remove counts the turns spray out the orifices & return mixture screws to there org pos. start here...

Mar 30, 2011 | Yamaha V-Max Motorcycles

1 Answer

Air idle mixture screw on a Carburetor 2006 sportster


The idle mixture screw is on the bottom of the carb behind the float bowl. Unless it has been modified, this screw is covered by an "anti-tamper" plug and you cannot get to it to make an adjustment. If you wish to make it adjustable. You'l have to take the carb off the engine, turn it upside down and drill out the anti-tamper plug. Be very careful doing this or you'll destroy the screw underneath the plug.

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1 Answer

Backfires at low rpms check engine light and owners manuel says ignition problem


As I understand it, your engine is spitting back out the carburetor when idling and runs poorly at low RPM.

This is probably because the engine is jetted way too lean. Now the newer model bikes have all sorts of computer stuff on them. I don't have a lot of experience on these but this is what we'd do on a 1999 or earlier model.

The low speed jet in your carb is probably a #42 jet. I'd got up to the next size, a #45 jet. I'd take the top off the carb and lift the slide out. Once I got the slide out, remove the needle. Put a 0.020" thick washer on the bottom side of the needle. I have found that a 3mm flat washer is the perfect thing to use. Slide the washer on from the lower tip of the needle and use a small dab of grease to hold the washer until it you get it back in the slide. Now, there is an anti-tamper plug over the idle mixture screw. You must drill a hole in the plug just deep enough to go through the plug. Use a tap to tap into the plug and force it out. Beneath the plug you'll see the idle mixture screw, turn it inwards until it lightly seats, the back it out 3 1/2 turns. Reassemble the carb, start the engine, and adjust the idle mixture screw for best idle. Set idle speed at 1000-1200 RPM.

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Jun 21, 2010 | 2005 Harley Davidson XL 1200 C Sportster...

1 Answer

Kelhin 40mm cv carburettor harley 1200 xls


No sweat. Screw the idle mixture screw in until it "bottoms out". Do not tighten or you will damage the screw. Back the idle mixture screw out about three turns. Install carburator and check for proper operation.
When you get the bike running, allow it to warm up and then adjust the mixture for highest smoothest idle. Set idle speed to about 1000 rpm with the throttle stop screw.

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