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Discussion Starter · #1 ·
I recently got an 09 550 and it will run fine for a min and then when you try to push the has it just Boggs down and won't go. Has a new battery and freshly oiled the filter. It's getting fuel and spark. Any ideas?
 

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Discussion Starter · #3 ·
I recently got an 09 550 and it will run fine for a min and then when you try to push the has it just Boggs down and won't go. Has a new battery and freshly oiled the filter. It's getting fuel and spark. Any ideas?
No codes at all on the cluster. I read somewhere that it could be because of a crack in the rubber boot between the throttle body and intake. Not sure if that's it though because it will run fine one day and terrible the next
 

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Welcome to the forum! The crack in the intake boot caused some motors to die prematurely due to dust/dirt ingestion damaging the cylinder. What does yours do when you rev it up in neutral? If it revs in neutral, then I'd suggest looking at the clutches, and one way bearing. Intermittent problems are a pain! Let us know what you find, or come back for more help!
 

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Discussion Starter · #5 ·
Same thing in neutral. Really sounds like it's choking out. Injector was pushing fuel in a good spray when I checked it. One thing is though when I changed the spark plug it didn't want to run with the new one. Possible the coil is weak or bad????
 

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Battery should read 12.5+ volts. Try a new spark plug(NGK CR7E), check the gap. Check all the efi plugs. Test your fuel pressure, should be 43psi.
Also search the atv forum for "550 starting" it's the same motor and you may be able to find someone's similar issue.


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