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Discussion Starter #1
So I was riding my 03 pro-x 800 and it had been running perfect all day. Went inside for a hour came back out went on the lake and it started backfiring really bad, died and couldn't start again. I did unplug the tps and i was able to get it started but it ran really bad. But it did run. It has 450 miles on a rebuilt motor, any ideas on what's wrong? Thanks for help guys.
 

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It sounds like a bad temp sensor. Run the sled for about 10 mins if you can and see if your getting a ohm reading from the sensor.
 

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Discussion Starter #4
Thank you guys for the answers but I found the problem, the white wire for the coil that goes into the CDI plug in and it slowly but surely came out. Over time it was shorting out causing the back firing.
 
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