The issue is that the helicoil in the stand bolt hole....February 11 2018 at 4:25 PM
|Brent Lykins (Login blykins)|
Response to Oil restrictors for BBM heads
....partially covers the oiling passage. So without grinding a little bit of the insert away, you won't get anything in a straight shot down in that hole.
Typically, if I know that I'll be running a restrictor, I'll grind that part away, and then either tap the hole for a 5/16-18" set screw, or a 1/16" NPT pipe plug. Then you can drill either plug for the right size.
You need something with about a .070-.080" orifice in it.
I would imagine if you got creative on shaping something, you could slide it in the hole around the insert.