605 no sparkin rear jug, then front jug - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
 
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post #1 of 5 (permalink) Old 06-15-2010, 08:27 PM Thread Starter
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605 no sparkin rear jug, then front jug

I have a 2003 Vstar Silverado. I road to work one day and it would start after work. The front cylinder had a spark using either spark plug but the rear cylinder had no spark with either spark plug so I assumed this was a coil issue. I replaced the rear coil and got new plugs and now neither cylinder has a spark. I did charge the battery and checked the fuses and it still doesn't spark. Has anybody ever heard of this? Any suggestions?
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post #2 of 5 (permalink) Old 06-15-2010, 09:41 PM
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Sound like you have a broken wire/connection at one of the coils. The red/balck wire gets its power fron your run/stop switch, there is also a fuse (ignition fuse) up stream from this switch on a red/white wire.
hopw this helps.

Doug

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post #3 of 5 (permalink) Old 06-20-2010, 12:36 PM Thread Starter
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Thanks for the advice. Here's what I have so far.

I'm not sure what I did but I do have a spark on the front cylinder again. The rear still is not sparking. When I put a volt meter on the 2 wires that go into the coil they both register just shy of 12 volts positive (11.95). So I have power going into the coil it seems. What does this suggest?
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post #4 of 5 (permalink) Old 06-21-2010, 12:14 AM
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Quote:
Originally Posted by Wally the Woodchuck View Post
I'm not sure what I did but I do have a spark on the front cylinder again. The rear still is not sparking. When I put a volt meter on the 2 wires that go into the coil they both register just shy of 12 volts positive (11.95). So I have power going into the coil it seems. What does this suggest?
Are you measuring between both wires or one wire at a time and ground? What voltage do you get when measuring the same way on the front coil? Should be the same. If not I would guess a bad ignition module. Also check the resistance of both coils both secondary and primary windings.
Hope this helps.

Doug

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post #5 of 5 (permalink) Old 06-21-2010, 06:03 PM
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I just repaired one with the same problem. In all likelihood it's a weak pulser coil, located inside the left engine sidecover. It's also known as a pickup coil or source coil because it sends the message to your CDI so it knows when to deliver energy to your secondary coils. You need to take the bike to a Yamaha dealer and ask them to measure the resistance at the pickup coil. It's coupled to the harness under the seat just below the rear of the tank. I believe it's a blue and black wire. If you can find out the spec from a dealer and you have a quality digital ohm meter you can measure it yourself. If it's out of the range tolerance it will not deliver spark to your coils.
It won't be cheap to replace as I believe beginning on the 2003 model it became an integral part of the stator coil. Before then you clould buy it seperatly for the 02 and 01. I hope this steers you in the right direction. Let me know how it turns out.
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