With the bogging issue, the only way around the OEM efi program is to purchase a power commander usb if you have a laptop. This mod works very well. By installing this on your 500 efi it will lean it out to power commander sees fit for your atv. And no polaris don't run well rich to wear the plug is black or dripping oil. I had this engine just wasn't efi. I purchased a power commander so I could set my own program due to performance upgrades. If I can run my atv at -20 celcius in Canada you won't have a problem with the commander and it's a simple install with instructions.
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