Question about 2003 Harley Davidson XL 1200 C Sportster Custom

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Warm bike up start riding can shift to 5 th and open throttle all the way chugs rite along but 4 miles later top end knocks under load

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  • Harley Davidson Master
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Hi, Alan and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking.
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Intake air leak.
10. Water, dirt, or rust in the fuel system, carburetor and/or filter.
11. Fuel tank vent system plugged or carburetor vent line closed off.
12. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
13. Carburetor controls misadjusted.
14. Damaged carburetor.
15. Incorrect valve timing.
16. Weak or broken valve springs.
17. Damaged intake or exhaust valve.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below, and for specific information or questions, please feel free to contact me at [email protected] Good luck and have nice a day.
Harley Davidson Manuals Mark Workshop
http://www.stcharlesharleydavidson.com/OEMpartfinder.htm
Owner Manuals Harley Davidson USA
Instant Tech Relief A must have !!! only $6 a month "CHEAP"

Posted on May 25, 2016

  • alan schramm
    alan schramm May 25, 2016

    thank you same ansewer from ever body else my bike is perfect shape looks brand new

  • alan schramm
    alan schramm May 25, 2016

    ever thing is new

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Posted on Jan 02, 2017

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