Question about Yamaha Motorcycles
79 xs1100 has a spark problem. Got it to run for a minute. Then shut if off. Went to start again, now I only get a spark just as I push the start button while cranking, no spark, then a spark after you let off the start button.
Hi, Aultman3 and the usual suspects are:
1. Fouled spark plugs.
2. Discharged battery, needs to be 12.5 volts or more and be able to pass a proper "LOAD" test, your battery may show 12.5 volts or more but has little or zero amps causing the battery to be faulty and must be replaced, AGM batteries fail in this category more so than lead acid batteries.
3. 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.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
How to diagnose no spark situation on motorcycle
OEM parts for Yamaha
Yamaha 1979 XS1100E Owner Manual
Posted on May 19, 2017
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Posted on Jan 02, 2017
sounds like the float in one or more carbs are stuck..you will hahe to remove the float bowls and check if the floats shut off the fuel supply..
Posted on Sep 25, 2009
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