Ducati Monster 797 Misfire Issue

Unfortunately, after the new customs regulations in Turkey, they are charging significant taxes on items over 30 euros. Until a few months ago, the limit was 150 euros, and a year ago, it was 1500 euros. Our dealer sometimes places orders on a whim; I’ve seen them make us wait 3 months even for the valve shims needed for the Desmo. We'll see, maybe they had stock available, as the same product was used for all L twin versions between 2016-2019.(Multistrada 950-950s-1200-1260-Pikes-Diavel etc)

By the way, if you ever visit Turkey for travel, let’s get in touch. I’d like to buy you a beer as a thank you. Cheers!!

 

The latest update: The dealer has the MAP sensor in stock, but the shipping didn't make it for today. It will probably be shipped tomorrow, so I should receive it by Friday. The price ended up being almost the same as Bike Parts Ducati.

 

new idle 2: https://www.youtube.com/shorts/4N9c3pMXeH8
new idle 3: https://www.youtube.com/shorts/RaLCmY8LIdg


Hey everyone, I wanted to share an update. After replacing the MAP sensor, the issue has improved significantly. I also increased the idle rpm by about 50 units, and it’s running much more stably now.

I also discovered something else—there was some carbon buildup near the exhaust valves of the vertical cylinder from before. I cleaned the area and sprayed some brake cleaner, and I noticed that the idle dropped instantly. This makes me think that the O-ring on the exhaust valve cover might be deformed.

If this were on the intake side, I would say for sure that’s the cause, but I’m not entirely certain in this case. That’s why I’ll apply some liquid gasket externally and observe its effect during riding and idling. If my suspicion is correct, I’ll remove it and replace it with a new O-ring

 

Not the exhaust manifold, there's currently a leak in the exhaust valve cover.
By the way, the crankshaft position sensor can also cause similar symptoms.