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Engine 2003 harley missing

Changed plugs wires coil cleaned carb

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Could also be a crank position sensor if a late model bike. make sure power is not sporatic.(depends upon model) the power flows from ign sw. through a fuse or cicuit breaker (circuit breaker could have intermitant contact) then to handle bar sw. which could have the same problem, then to the bank angle sensor which could have the same problem and finally to the ign module. hey, pyrhyc, what is a jet seat? (what a fighter pilot sits in?) a jet is just an orfice, which i agree could wear but if it does, a rich mix will not miss. it will usually cause sooty plus or black smoke from the exhaust. if too rich, the bike will bog out and/or quit running. a lean mix will cause a misfire. if you are talking about the mix needle, it does not seat in the carb, it only controls the amount out fuel that slips though the main jet until wot. screaming chicken is a good module but i would not buy them when aftermarket is much better. unless it is strickly race, big brother still has his fingers in it and limits the full potential of the bike. higher revs are ok but there are other mods that need to be done before going there. the number one hold back is hd hydraulics. they are good for a stock setup only. there are cheap ways around this and then there are expensive ways are this.

Posted on Sep 07, 2008

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Without being able to hear the miss, I'm going to have to give you a couple of different solutions, and you'll have to figure out which it is.
1- is going to be a spark miss. Since you've done the plugs, wires, and coil, the only thing left is the ignition module. Check and clean the connections for the module, and check all wires for any bare spots, dry-rot, corrosion, breaks, or a loose ground. If you're getting a weak or sporadic spark, any of these could cause it, or the module could be going out. If you change out the ignition module, I recommend using the Screamin Eagle or an after market module with a hotter burn and higher rev limiter for better performance.
2- is going to be a fuel miss. It could be that the jets or the jet seats are worn, and that you're getting slightly more fuel than what it's set up for. It's generally the jets that get worn, and rejetting the carb will fix it. This eventually happens with all carb models.

I believe that it going to be one of these two, and it may be time for upgrades anyway. Upgrades are always cool. Anyway, let me know how this works out for you.

Posted on Sep 03, 2008

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Posted on Jan 02, 2017

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8. Loose wire connection at coil, battery or plug between ignition sensor and module.
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2. Fuel supply valve turned off.
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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.
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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 especially the negative cable at "BOTH" ends
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.
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