Quote:

It looks like a #78 or 1/64 drill. That would be 0.0156 -0.0160 inch.



OK, just so I'm clear on this point, given the very small margin of error, the K47 jets that you have on hand measure approximately 0.0156 -0.0160 inch at the inlet bore?

If that is correct, then that confirms the pilot jet bores are not true to actual mm size.

For reference, here's what I understand regarding SAE gauge and mm/inch conversion:

.3683mm .0145" #79
.3969mm .015625" 1/64"
.4064mm .016" #78
.4572mm .018" #77


Given that, I'm back to my original plan of finding a bit that will pass through a 48 but not through a 45, and drill the pilots if necessary.

What do you think?