Throttle Lag until 2000 RPM

[Parminio]

I would not recommend drilling jets if you can get the size you need. If you do decide to drill, you should use a pin vise and a carburetor jet tuning drill set. Drilled holes are not perfectly round and for precision work, need to be reamed to the correct size. Both operations should use lubrication for non ferrous metal. Wax can be used for brass. There is also a radius on the entrance and exit of the jet. If this radius is disturbed by drilling, you may have affected the performance of the jet. Also, drilling in brass tends to grab the bit.

https://www.ezbore.net/category-s/1882.htm

Cost of 40 jet reamer + risk of making a mistake: $21.32
Cost of four (4) brand new 40 jets: $23.56