I'm sure I can look this up in my book. But I'm at work and just curious. Where is the filter in relation to the oil pump? Does oil go from the pump through the filter or, is it from the filter to the pump. Seems to make sense that it would go from the pump to the filter then to the engine but, I don't really know.

Years ago (way on back) I worked on recipricating aircraft engines, radial and horizontally opposed. I worked in the test cell and we always cut filters open on the engines that we ran in the test cell looking to see what kind of metal they were making. New ("0" hour) engines always make a little. As long as it's very small, and I mean very small flakes, like dust size, your fine. We could tell by what kind of metal it was as to the likely part that produced it.

Anyway, if something in a Harley BT started failing, or had failed, I'm guessing that the metal would hit the pump before it could be filtered. Is that correct?

 

Yup, goes through the pump before the filter.

 

It starts in the tank then goes to the pump then the engine then the filter then back to the tank.

Is that what you were looking for?

 

Evo has the filter on the return and twin cam has it on the feed.