Xj1100 project

[Mpl]

Good afternoon,

I purchased a 1983 XJ1100 a few years ago. It has been a great bike. This winter I decided to tear it down. I am working on the lower half of the crank case and noticed a hole. I’m not sure if it is supposed to be there. Does anyone know if this normal?
thanks in advance

[Mpl]

Here’s a better picture the hole is at the bottom.

[Bax]

Hi Mpl, Welcome! Not too familiar with the XJ case casting but I'm sure some on here are. Is that bore where an alignment pin sits? Pit goes thru to the webbing support?

---Bax

[bikerphil]

The XJ11 cases are the same as the XS11, you can even see the 2H7 stamped into one, about the hole, IDK.

[DiverRay]

It's been running well before teardown, don't worry about it! I'll look at my '78 bottom case later this week and see if it has the same thing.(If I can get to it!)
To me it looks like something Yamaha has done at the factory.

[bikerphil]

If this is what we are looking at, I have a case nearby I can look at...

[bikerphil]

Looks like my 79 case is drilled all the way thru. The other side of the case that mates up to that hole goes to a dead end chamber so I would think it shouldn't cause any problem. If any oil is going thru there it would be the middle drive oil.