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This past weekend, I installed a brand new HMF Titan QS on my Sportsman 850. I did not opt for the HMF Fuel optimizer - as I also just purchased a Dynojet Power Vision CX from RVS. I am currently waiting for my custom tune.

Once I installed the new HMF slip-on, I took a quick ride around my neighborhood. I understand that the ATV will run lean until I flash the custom tune - but didn't think the attached image would be the result after 5 minutes of riding...

Is this anything to be worried about? And will the pipe get discolored like that regardless if its running lean? I'm not going to ride anymore until I get my tune.


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