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2015 rzr 570 backfires

2.8K views 7 replies 5 participants last post by  Denver  
#1 · (Edited)
machine has set all winter i put dry gas in it hope that's the problem new spark plug but its running rich plug is black any ideas of what's problem? Haven't run it since I put dry gas in it.
 
#2 ·
Valve timing. Common 570 problem.

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#5 ·
So what causes the valves to get out of time? Chain tensioner or broken chain guides? Its only 5 years old.

John
Just wear on the tappets, I think. Or, depending on the engine, the buckets used for shimming. Some oils protect better than others; see the "best oil" threads and search "zinc".