Take the gear shaft out, thread the housing for 6x1.0. Use and allen head bolt with a washer. Loctite the bolt in. Mine's done like that and doesn't leak a drop.
I did the same thing except with a 1/4-20. No leaks.
1978 KZ650 D1 ~ Carb jetting: 107.5 & 20 & 4th groove with pods and 4-1 Exhaust
