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Discussion Starter #1
I'm having a problem with the trx 90 05'(no spark). Does anyone have the proper procedure and specs for checking the ignition and run/stop switch? Coil is good, spark plug brand new.
Appreciate any info,
Rich
 

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HEllo rich welcome to the forums.

Right now the easiest thing I can tell you to try is unplug the run/stop switch and bypass it this will determine if you have a bad switch or not. If I had a schematic of that partiicular atv I could be more help.
 

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I agree try a jumper first
 

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Does it have two wires coming out of the throttle housing? while trying to start motor give a little throttle and see if any spark and have the plug boot off with a plug in it and groundes to motor so you can see, if you have spark jump the two wires . not sure if the 90 has this safety feature.
 

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Discussion Starter #9
bypassed the run/stop switch, still no spark. does this mean the ignition switch is the culprit? anyway to test the ignition switch?
 

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Sure you can by pass that too... I just need to know how many wires and what colors
 

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Discussion Starter #11
both the ignition and run/ stop wires are the same(2 wires each switch,1 black and white wire, and 1 green wire)
 

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Well if you unplug the switch...on the harness side one wire will have a male end and the other a female just plug them into eachother. that ommits the switch. Example: Black/white is ignition signal from CDI unit it feeds the run/stop switch and the key switch, green is ground it feed the same switches asa well as any lights, alternator ect. if you have a headlamp with Hi and Lo the Hi beam wire is blue the Lo beam is white and Green is ground. the Tail lamp is a brown wire and a green wire. Keep in mind the Green wire feeds the ignition Coil as well and the blue/yellow or what ever other color you have is fed directly from the CDI.
Your CDI should have 6 wires , gray, blue/yellow, green/white, black/yellow, black/white, and blue/red this is going by my schematic but your may still be the same.
 

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i went and checked my son's wiring on his 90 and it was all sealed up and I would have to remove all the plastic to get to the rest. sorry couldent help:wacko:
 

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Discussion Starter #14
hey moose, been away from the pc for a bit and just got your "EXPERT" advice. info much appreciated, I'm gonna have it running by the end of this week. leaning towards ignition switch and local shop doesn't have one in stock. let you know you know how it goes.
 
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