Yamaha Star 650 Ignition Testing and Troubleshooting - From The Battery to the Spark - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 1 (permalink) Old 08-05-2019, 06:38 AM Thread Starter
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Location: Clermont, FL
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Yamaha Star 650 Ignition Testing and Troubleshooting - From The Battery to the Spark

In todays video we will be going through the complete ignition system from beginning to end to identify problems from within the system that might be causing issues with the bike. This is going to start off with the battery, because no voltage, no spark. Ill assume everyone has at least a cheap Harbour Freight volt meter by now, so well remove the side cover and get a quick voltage, you may need to throw your bike on the charger to continue later.

If the voltage is determined to be good, and/or the starter can turn the engine, the battery should be ok to continue. Above the battery and off to the right are the fuses. All should be checked before continuing onto the next step. Don't forget the Main fuse to the right if there is no indication when the key is turned.

Now we turn our attention to the coil. disconnecting all cables from the spark plug and the two coil connections. Remembering the positions. The two connections on back of the coil are measured for resistance to see if its in specification, this being primary side between 3.8-4.6 ohms. The secondary off one post and the end of the plug, plus adding 10K ohms, so subtract 10kohms from the meter value. to fall between 10.1 and 15.1 kohms.

There is also a pickup coil check to be done next this is between 182-222 ohms, this is pass fail. If it fails, well, this is a different video altogether, but at least points to the problem. Following this a good test if to measure battery voltage to the back of the coils as demonstrated.

This brings us to a test section where we want to make sure there is no gas in the carbs, so we run the starter until the carb bowls are empty, and/or drain the bowls. Using the spark gap test tool mentioned before, we can check for spark outside the engine by connecting this from the wire to the cooling fin and running the starter. Such a test confirms good ignition.

Still no spark with this good, this points towards the plugs, so its time to pull the plugs for inspection and gap measurement or replacement. The standard gap is .035. A plug test I use though not recommended is to ground the plug to the cooling fin to see if they work.

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