2.5 using oil

[BrewinProf]

My 2025 also seems to be using oil. I've put in 2 qts in 5000 miles. No sign of drips on the garage floor, or around the gear shift gasket you all are talking about.

 

[Protonhound]

I'm no engineer but have done enough mechaniking in my life to know a bad design when I see it. The case joints are all sealed with gaskets that compress when torqued down to provide a proper seal. Then Triumph decides to put not one but two o-rings at the lowest part of the bike obviously hoping that whatever seeps past the first one will be stopped by the second one which makes no sense. The o-rings aren't even compressed but just snug in the opening. Maybe originally the rubber compound used was different and actually sealed it much better and then there was a change in supplier and this problem creeped in. I have a feeling that this will be a recurring issue for most of us that are actually aware of it and I wonder if anything has changed with the recent models.

 

[Protonhound]

My 2025 also seems to be using oil. I've put in 2 qts in 5000 miles. No sign of drips on the garage floor, or around the gear shift gasket you all are talking about.

After riding stick your finger up underneath that side cover on the left and you'll be able to feel the sensor and one of the bolts. If it's greasy/oily then that would be it and it only seeps out when the bike is running and cooks off on the hot case.

 

[BrewinProf]

Thanks. I'll give it a good cleaning and then check it out after a ride.

 

[Protonhound]

Now I have another set of new o-rings and the Permatex goop is setting up. I applied it to the sensor around the black plastic housing behind the o-rings so when I re-installed it the o-rings got pushed into the opening with the goop behind it effectively trapping the goop between o-rings and exterior housing. I let it sit for an hour at finger tight before torquing the bolts to 10Nm. There is a slight taper on the outside of the opening presumably so the o-rings can slip in easier (I forgot to take a picture) and since the part of the sensor that's inside the case is slightly smaller than the opening the sealant will be thicker there. Instructions call for waiting 24hrs before use so to be on the safe side I'll let it sit for at least 48. This stuff is not really designed for filling gaps and provided I did not create any air holes when installing it and it'll set up properly I hope that this will be it once and for all.
Of course I may never get that sensor off again after this...
At least now I can go back to obsessively tracking my Vandemon exhaust which is apparently just hanging out at the airport right now.