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Discussion Starter #1
I have a 2012 sportsman 800 and yesterday i went riding and it ran fine for the first 30mins. Then the quad started to backfire and stalling and the ingine light came on.
I tried several times to start it after ckecking the plugs and plug wires and it still was backfiring and stalling.
Then the next day it started up and ran perfect all day, the check ingine light even went away - i rode for 30miles. When we got back to camp i stopped riding for about 30mins and when i went to start the quad back up it once again started backfiring and stalling and the check ingine light came back on... any ideas as to what is going bad?
 

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Discussion Starter #3
The code i am getting is 21
Which is not in the manuals list of codes...
 

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Discussion Starter #6

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Give that harness a REALLY good thorough inspection. Look at where the loom ends and contacts the wires. Also points where the loom/harness contact the machine.

Oh and code #21 is "loss of synchronization".
 
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