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Hi I bought a 2010 arctic cat 550 h1 efi trv and when I start to slow down it makes this noise like it backfires a bit what could be the problem I'm new to owning an atv
 

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That is the sound of engine braking, small popcorn like sounds usually aren't a concern, but you could check your valve's adjustment, if they are off, it could cause the small backfires.


Mike
 

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That's exactly what it sounds like. Where are the valves and what are the valves called
There is a good procedure in the service manual. Just do a forum search and you'll find MANY posts telling you where to download 1.
 
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