2016 Bonneville T100 - Question About 2 Mystery Plugs

Just behind the exhaust crossover tube are 2 small plugs: one that threads front to rear, and another that threads from the bottom up.

The heads both appear to be 6.5mm Allen.

Does anyone know what these plugs are for?

I may consider using one of them for an oil temp. sender tap site.

 

To NickJaxe, it is very difficult to get a good picture. I tried. The location of the 2 plugs is exactly where I described. They are also just below the starter. If you have a 2016 T100, you will see them.

To Sandi T, I appreciate your enthusiasm. Most people don't pick up on that.
Don't Fear the Reaper

 

I meant to respond to this - good point. Yes, of course the sensor would need to be within the sump oil. The horizontal plug (below starter/behind the exhaust cross-tube) I am entertaining may meet that condition. This must be determined. Next time I change my oil. I will first remove that plug (uses 6.5mm Allen) and see if it seems to be below the oil level. If not, it won't be suitable.

 

I'd like to update this thread. After reaching out to 2 different sources in the UK, the best response I got was from Triumph Motorcycles America LTD:

"What you are seeing is likely oil galley plugs used in manufacturing."

This seems plausible but I still wish that I knew whether the full oil sump level comes up to the level of at least the bottom plug. (I could probably find out the hard way ...)


Recall that I thought the plug heads were a "6.5mm Allen". Besides the fact that this wrench is impossible to find, I laid under the bike again a few days ago and probed the head a little more. After a lot of inspection, I discovered that the head isn't an Allen at all; it's Torx !! Specifically, a T-50 wrench fits perfectly.

Without more/better information on that plug, I'm not sure where I go from here, But I at least wanted to let anyone know that the plug head is Torx T-50.

 

The level in the sight window might give me a ballpark clue ... you're right Nick. I haven't tried that but probably should.

The very best way would be to warm up the engine ahead of an oil change, get the bike vertical with the earth, and remove the lower plug with my Torx wrench. That's what I meant about "the hard way".

 

If I get to that point, that is exactly what I would do. And actually - if you've been following this thread from the beginning - the goal, if the plug is immersed in sump oil and there is room inside, is to find a 12V sender to insert for an oil temp gauge. It may be the very best spot.