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Discussion Starter · #1 ·
I have air gas and motor turning over. But no spark. I have ran a power check from ignition coil to ground. And from coil to wire. Tested out fine. Still no spark. I’m about to give up. Can the plugs have fouled out due to sitting for 3 months??
 

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doubtful it's the plugs, keep it simple, double check that the kill switch on the handlebars is in the right position. Other, smarter members will be along shortly to give you a hand.
 

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Look at the ICM wires. Black wire is the +12 volt supply for the ICM. Several other wires susceptible to breaking. Power check on IGN coil?? It gets +12v from the kill switch. The ICM driver transistor provides the Ground..
WHAT YEAR VTX???
 

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Discussion Starter · #4 ·
Look at the ICM wires. Black wire is the +12 volt supply for the ICM. Several other wires susceptible to breaking. Power check on IGN coil?? It gets +12v from the kill switch. The ICM driver transistor provides the Ground..
WHAT YEAR VTX???
I have checked power from the kill switch. I get 12.98. The black wire was broken but rewired. The bike is a 2006
 

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There are several more wires that could break, check more.
The Green wire (IPG wire) most forward was the other common broken wire.
Did replace or pull out the battery? That has caused ICM wire breakage.

You can do some tests from the ICM. You can check for resistance for IPG, TPS.
With IGN switch ON you can check for voltage. ICM connector with wires/function.

There are two wires for safety. Either one has to have a Ground at any time
to have the engine running.
Neutral switch or the Kick Stand switch has to be UP for Ignition.
 

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It is a bit more complex. There are some diagrams that are useful.
Ign switch > Ign fuse Black wire powers the Kill switch and ICM.
The Contact on the Kill switch with Black/white(stripe) powers the Ign coils.
Check the IGN coils for voltage on the Bl/W wire.
Do you have a multimeter??? Know how to use it??
The ICM will pulse a Ground to the IGN coil to create a spark.
There is also a Ign Pulse Generator which provides a 10 volt AC signal or
192 ohms resistance.
I suspect a Green wire to the ICM could be broken also.
 
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