Join Date: Jan 2017
Location: San Antonio, TX
Balancer shaft chews through oil/coolant seals - issue plagues 2017+ Dukes
I just got my bike back from the dealer after about 3 weeks in the shop.
I was changing oil, and saw it was very milky when I drained it. I put the drain plug back in, put some of the oil into a plastic container for the dealer to verify, and called my insurance company to tow it.
Tow truck picked it up, drove about 80 miles to the nearest dealer, and dropped it off. Side note: it pays to pay that $8 roadside assistance charge for your insurance! It would've cost me at least $100 to tow it myself.
Dealer said the balancer shaft frequently chews through the seals that separate the oil and coolant reservoirs on 2017-2018 Duke 390s. They also said two more bikes came in a few days before they got mine in, with the same issue.
So FYI to all of you with 2017+ bikes out there, especially the 2017-2018 MY, you might run into this issue sooner or later. Just keep an eye out on your coolant levels in the overflow reservoir, and if it starts going down more than once, definitely check oil.
Dealer reassured me it should be much better now, which of course it should, duh.
Let me know if anybody has any questions.