General ATV Discussion Discussion Forum for Arctic Cat ATVs

Old 05-22-2010, 10:13 AM   #1
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ATV: 2006 Artic Cat 650 V2
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Well I checked my carbs and their pretty much spotless. However I did get the chance to crank it while the cover was off and I noticed that when the carburators would spit it blew flames up. I checked my filter and sure enough there's a black spot right where the carb would be. So my question is does this thing have a timing chain or anything? And if this is the problem how do I fix it?

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Old 05-22-2010, 11:14 AM   #2
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The ignition timing is fixed and not adjustable, but can be checked with a timing light. Ignition timing advance is controlled by the CDI or ECU or what ever the official name is for that module on the V2. In the pinned section you ought to be able to download a service manual for the procedure. As for what you are experiencing, the V2 has been known for stretching out its cam chain which can lead to improper valve timing. another thing to check is your valve clearances. if the intake valve is leaking a little it could shoot a flame back out of the carbs, once again see the service manual.

I'm sure there will be some more experienced with the V2 adding their comments as well.
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Old 05-22-2010, 11:15 AM   #3
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yes they do have a timing chains and this model is known for the chains to stretch.

however you should check your valve adjustment before you go tearing into the engine. valves being out of adjustment will cause hard or no starts and also backfiring thru the carbs. start with valves. check the sticky section for proper valve adjustment.
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