1977 KZ750 twin main jets

I ordered a jet kit from 6 Sigma and the new main jets (right) look different from the old ones (left). Even the orifice looks different. The stock ones have a hole for the tip of the needle to sit in, the new ones don’t. They told me that they work because the threads are the same and the orifice is right. Anyone have info or thoughts on this?

Never seen any main Jets like yours on a Kz750 twin carb (Mikuni BS34 ).
Any pics of your carbs would help.

www.z750twin.de/schnittmotor.htm
www.z750twin.de/vergaser.htm

They’re BS38’s.

The BS38 needle and bleeder tube is off-set from the main Jet.
So why do you want to change the main and pilot jets, they will never wear!!!



Edit : New picture Shows the Pilot Jet position

Gotta love the learning process......

The kit calls that the pilot jet, and the one I’m questioning the main jet. What is the jet pointed to in my pic?

Sorry my fault, i did mistaken the main and pilot jet position. :pinch: :pinch: :pinch:
Your picture shows the correct main jet position.
Edited my previous post

If you are looking for main jets for these carbs Search N100.606-SIZE and there are lots of options. I bought some and they fit