Question about 2006 Harley Davidson XL 1200 C Sportster Custom

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1999 harley xl tuns over but wont start

Fuel lines clear getting gas to carb .replaced battery .sonds like its flooding out will not fire

Posted by Anonymous on

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  • Harley Davidson Master
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Hi Anonymous, when checking for spark the CKP needs to measure the compression bump in order to send the correct signal to the ICM/ECM so always check for spark with either a third plug grounded or lift the end of the plug boot 1/2 " off one of spark plugs that are in the head. and the usual suspects are:
1. Fuel tank empty
2. Fuel supply valve turned off.
3. Fouled spark plugs.
4. Engine flooded with gasoline as a result of over use of enrichner.
5. Fuel valve or filter clogged.
6. Vacuum hose to automatic fuel supply valve disconnected, leaking, or pinched.
7. Discharged battery, loose or broken battery connections.
8. Loose wire connection at coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, spark plug cable connections loose,
or cables connected to wrong cylinders.
10. Ignition timing incorrect due to faulty ignition coil, ignition module, or sensors " Manifold Absolute Pressure" "Camshaft Position Sensor" "Crank Position Sensor" "Brake Apply Sensor
11. Engine lubricant to heavy ( winter operation )
12. Sticking or damaged valves or push rod wrong length.
13. Primary cam sproket spline sheared or missing spacer.
14. Security alarm system not disarming.
For a primary suspect please visit the website below: Good luck
Harley Diagnostic Codes 04 to Present

Posted on May 28, 2015

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Posted on Jan 02, 2017

  • 9 Answers

SOURCE: Harley Davidson will not start

you say at times its fireing. sounds like ignition problems. does it have points? if so they may me worn out. I have an 87 sportster evo that has points in it.

Posted on Jan 21, 2009

v2iper
  • 150 Answers

SOURCE: 1999 road king wont start

Its your fuel pump if you can't hear it. And its inside your tank. Not a hard fix if you have a book that tells you how to remove it. Alot of procedures to follow to get it right. And yes it does work off a relay.

Posted on Jun 14, 2009

  • 3 Answers

SOURCE: 2003 Harley Davidson XL 1200 C Sportster Custom

vapour lock in fuel line caused by leak below filter to carbs , replace lines and vacume. had same prob and after many attempts and dangerous situations found minute cut in line . when it happens release line to tank and let fuel flow re connect. will happen faster second time. 3 miles or so

Posted on Nov 02, 2009

wd4ity
  • 4565 Answers

SOURCE: i have 1990 harley flhs ..model flt 1340cc..when

It sounds like the jets in your carb are stopped up. It could be any one of several things but the problem is in the carb. Cleaning the outside of the carb makes no difference, you must remove and clean out the main jet and the slow speed jet. Also you need to check the operation of the accelerator pump. Even spraying carb cleaner inside the venturi of the carb does no good, the carb needs to be completely disassembled and cleaned. To be more specific, I'd need to know exactly which carb is on the bike, keihen butterfly, keihen CV, or aftermarket.

Posted on Apr 21, 2010

wd4ity
  • 4565 Answers

SOURCE: 2001 Heritage softail, carburated. Gas in oil.

If you had gasoline in your oil, there's only two ways for it to get there. It either came through the carb or someone poured it in there.

I've been messing with Harley's since 1966, back before they created these cute little names for the engines like Panheads, Shovelheads, Evolution, Blockhead, Fathead. We only had two engines, Sportster 61 cu. in, and the 74 cu. in. in the big bikes.

Now, the way the fuel got into your gasoline was through the carb. If you've ever watched an old timer get off his bike, he'll reach under the tank and turn the fuel off. This was keep what happened to you from happening. It worked every time. The problem these days is in their infinite wisdom, Harley has adopted the misguided conception that the Japs started, the vacuum operated petcock. The absolute worst invention man has ever designed and put on a motor vehicle.

Now, in both the petcock and the float bowl of the carb you have a "needle and seat" all it takes is one very small bit of trash to cause the gasoline to seep past the needle. Keep in mind now that gasoline has a lower viscositiy than water. It will go where water won't go. It's thinner. A lot of gasoline can seep past a needle and seat in a 12 hour period. I've seen fuel tanks empty themselves in that time.

I've fixed many bikes that had the vacuum operated petcocks on them. They started putting them on the bike in 1996. I've seen people stranded beside the road with full tanks of fuel but not a drop getting to the carb. I've seen gasoline pouring out the small vacuum line (probably what happened to you) after the engine had been flooded out due to a ruptured diaphragm. And, I've even seen a couple of cases where the engine was sucking air through the petcock and would not idle or even run very well.

Now, when you change the oil on a harley engine, you don't get all the oil out of it like you do on car engine or a Japper engine. There will be a certain amount of oil left in the top of the heads and the camchest. Also, the gasoline fills up the crankcases that are supposed to be empty of oil. If you have a quart of gasoline that has run down past the rings into the crankcase, you now have one extra quart of fluid in your oil system. Whenever I suspect something like what happened to you, I always take the spark plugs out and spin the engine over a few times to get any excess fluid out of the crankcase. It will blow it out of the crankcase vents which in your case is in the heads. Those big bolts that hold the air filter backing plate on are hollow and are actually crankcase vents.

So, in short, my suggestion is to take that vacuum operated petcock off your bike, plug up the vacuum hose, and purchase a high quality manually operated petcock like a Pingle. They're expensive but if you get into the habit of turning it off whenever you get off your bike, this problem will NEVER happen to you again.

BTW:, you need to check your primary oil to see if it's been diluted as well. The gasoline will go past the sprocket shaft seal and contaminate that oil as well. You're pretty safe on the transmission lube though.

Good Luck
Steve (old biker)\\\\\

Posted on Jul 11, 2010

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Your comment about it running only as long as you're spraying carb cleaner into it tells me that the gas isn't getting to the carb.

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Flooding starting


Check fuel pressure. You may have a bad fuel pressure regulator. Pressure may be too high, or the regulator diaphragm may have failed-if it is vacuum operated, pull off the vacuum line-if any evidence of gas in the line, the regulator has failed, and letting gas get sucked into the engine through the vacuum line. That could explain the gas smell and the flooding.

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Hi Mikebecvar, and the usual suspects are:
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Oct 01, 2010 | 2003 Harley Davidson XL 1200 C Sportster...

1 Answer

Bike wont start flooding out


By "gas valve", what are you talking about? Are you talking about the fuel petcock in the tank or the "needle and seat" in the carb? You say you changed the float and the "gas valve" but did you set the float height?

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1 Answer

Can't figure it out !!!!


Hi,

There are 2 major requirement for a gasoline engine to fire, fuel and ignition. Since you have spark, then ignition is the least likely problem. No fuel could be verified by removing the air cleaner and pouring a small amount of fuel down the throat, start the bike, if it start and runs (even for just a moment), you have verified the fuel problem.

Problems then could be traced along the fuel flow from the ank all the way to the carburator. In some instances of run out of fuel, the bike will have a hard time starting due to:
1. air bubbles in the fuel lines;
2. valve in carb stuck in close position;
3. flooding of both carb and intakes;
4. (in some cases) vacuum insifficient to open petcock or fuel valve/switch.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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