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muletrain60

2007 Arctic Cat 400 ATV No Fire

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Machine ran fine one day, next day nothing. Replaced the coil still no fire. Battery is fine, have lights, dash indicators, etc with key on. Cranks over, just no fire.  How do I check the CDI?  Also what is the probability of the stator being bad?  Thoughts?

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Have you checked for spark and there's no spark? I always think spark, fuel, and then timing.

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Spark plug could have gone bad, I owned this exact machine, I had a crack in the spark plug boot once, I replaced the coil & boot as one assembly, it was only a few bucks more to replace both.

but change the plug first

 

 

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Definitely check boot for a tear or crack.

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THANKS. We have and ran all troubleshooting procedures. Comes back to the CDI. Waiting for one now. Will update later. Again Thanks

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Okay, update time.  Installed new CDI. NOTHING! Same problem exists! I'm perplexed...What are the odds of receiving a bad CDI?  Bad Wiring Harness(s)? I could really use some feed back here. Thanks in advance.

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Here is the schematic, looks at item 21 lower right corner, that is the stator, the three black wires are the AC volts for the charging system, the other four wires are the trigger for spark. The 2007 400 models were known for wire harness problems.  The service manual is in the link below. You will have to check to make sure you don't have broken wires from the sensor to the CDI. 2006 and earlier models did have an issue with the stator magnets becoming unglued, but this was solved in the 2007 models. I had that machine for 9 years and put 16,000 miles on it and never had a stator problem. I did have wiring harness problems twice. The service manual should have the procedure to test the spark trigger.

Mike

 

http://www.mymowerparts.com/pdf/Arctic-Cat-ATV-Repair-and-Service-Manuals/arctic_cat_2007_400_500_650_700_service_manual.pdf

2007 400 Schematic.jpg

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Thanks for the info and reply. I've done all these, but may go back to them. The boys are sending another CDI in the meantime. I'll keep ya posted. Again thanks.

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Did you ever redo any tests on the stator? What kind of resistance was there....seems more likely to see a bad stator than a cdi problem.

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Alright gang here is an update!  Finally pulled the case off. Magneto looks great.  4 of the magnets in the rotor are loose and sliding.( Any home grown epoxy fixes?) Other wise new rotor.  The outer magnet has no magnetism at all. How can the trigger work if this is my finding?  Thanks

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UPDATE.....UP and running. Replaced the flywheel.  Good to go. Great kit from RMSTATOR. Thanks again for the input and advice. Great group.         Muletrain

 

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sometime the magnets go bad or crack on flywheel if glue lets go

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