Mikuni hex main jet thread !!!

[John Orchard]

Hello Chaps, I was looking for a thread-tap to suit Mikuni hex main-jets, according to the Mikunioz website the thread is 5.3mm diameter by .9mm pitch, what tha! After a bit of searching I am not having any luck finding a tap, anyone got any ideas? Me not having a clue about anything imperial, would there be an imperial measurement that would come close?

[Momus]

Goliath taps will make you a tap.

If you are doing the male thread, you will need a die. Goliath may do those as well.

Goliath Threading Tools
goliathhardware.com.au
3 Kingston Park Court, Knoxfield Victoria 3180 · ~25.8 km
(03) 9387 4755

[sleepy]

I think the thread is a carry over from Mikuni being licensed copy of Amal. I have a set of #12 UNF 28TPI taps and die and it is very close, the diameter is 5.4mm and 28 TPI works out as .907mm pitch.
Funny a while back there was a Chinese site selling Mikuni jets in what looked to be common sizes but unfortunatley they had a 6mm thread and the jets sizes were mm and not flow rates. Maybe they fitted the Chinese Mikuni or was that Nikuni or whatever knock off they were peddling. I got some and used the #12unf die on them and they screw in ok and the sizes didn't matter for methanol as every time I drill a jet for meth I engrave the MM size on them. Without looking it up what they supplied as a 200 was 2.00mm and probably around a 450 mikuni.

[John Orchard]

Awesome Chaps, thanks, always get good help here.