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Discussion Starter #1
I have fire in the front cylinder but nothing on the back cylinder of my 2001 V Star 650. I old coil was shorted. I have replaced it with a new one and still nothing. The coil starts to get hot after a while with the ignition on. The front one remains cool. I've swapped out the coils. Both coils will fire on the front cylinder. From what I see, there is only one igniter. That tested good. Could something be shorted out in the ECU causing the problem? Thanks.
 

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Did you replace the spark plug cap or did the new coil came with a new cap?.

Sometime the spark plug cap goes bad. Only way to know if the cap is bad or good is by ohm testing.
 

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Here is a shot of Yamaha's spec along with pictures of a bad spark plug cap and a good one.

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Exhibit A - This is a bad Spark Plug Cap
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Exhibit B - This Spark Plug Cap is good.
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Have you tested the relay unit?.

Additionally here are troubleshooting steps for no spark or intermittent spark.

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Btw, Welcome to the club from Southern California.
 
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Discussion Starter #6
Thanks. I swapped out the cap from the one that was firing. Still no spark. I'm going to check out the relay. I was also going to pull the battery out and take a look at the wiring running to the ECU. Maybe something is shorted out.
 

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If you unplug your rear coil, you should have 12 volts at the terminal with the ignition in the ON position.
If you do not have 12 volts at the terminal that will be a good starting point.
 
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