Question about 1978 Suzuki GS 750 E
I have a 1978 gs750 with a TSCC engine. The spark is weak and intermittent. Plugs are new.
Hi, Bobsallthing and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario 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 pulse coil.
8. Faulty CKP, CMP, or BAS sensor.
9. Faulty ignition switch.
10. Tilt sensor needs a reset.
11. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing 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 Suzuki
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Posted on Oct 06, 2017
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Posted on Jan 02, 2017
HI THATS ODD TO HAVE 3 SPARKING, AS THE IGNITION COILS ON THE OLD GS WERE 1COIL FOR 2 CYLINDERS IE 1&4 CYLINDERS USED 1 COIL AND 2&3 USED THE OTHER , SO IF YOU ARE GETTING A SPARK AT EITHER OF THESE THAT MEANS THE COIL IS WORKING, ON THE COIL THAT IS ONLY GIVING A SPARK AT 1 PLUG SWAP THE PLUG OVER AND SEE IF IT THEN SPARKS IN THE OTHER CAP THIS WILL ELIMINATE THE PLUG, IF THE PLUG THAT WAS SPARKING IN THE OTHER LEAD NO LONGER SPARKS IN THE OPPOSIT LEAD THEN OBSERVE THE LEAD REMOVE THE CAP AND EARTH THIS OUT WHILE YOU TURN OVER THE ENGINE, THIS WILL ELIMINATE THE CAP,
Posted on Aug 31, 2010
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