I bought a couple of 90 degree fuel outlet barbss for the petcocks a while back, I thought it might make it easier to connect the fuel hoses. Hah, so much for that:. These things are a bugger, impossible to get the barbs pointing horizontally and impossible to stop them turning around when trying to connect fuel hose to them. One started leaking recently, so I took the petcock apart only to find the thread that takes the fuel outlet had uncoiled, Helicoil possibly? Anyway, easy fix thought I, drill it out and Helicoil it. The thread looked like an M6, so I drilled it out, threaded it and inserted a helicoil. When I tried screwing the barb in, no way, not on you nelly!
I donned my loop and checked the thread, nope, not M6, further checking revealed it to be a 6.8mm brass thread, 26 TPI. Should have checked I suppose, the 74 is a hodge podge of different sizes, different threads: The bike has metric threaded bolts, an imperial sized master cylinder, a couple of other imperial sized bits and all the other brass threads on the bike are metric. Only in Japan!
I've drilled out the threaded hole to 7.5mm and tomorrow I'll spin up a 6mm barb with a 7.63 shaft base and press it into place.
Sizing on the 74 is a bit of a hodge podge, mostly metric, as you'd expect, but also a few imperial sized bits, master cylinder bore, and clutch pushrod and ball to name a couple. There were a couple of other imperial size bits I found when I was rebuilding it.
I donned my loop and checked the thread, nope, not M6, further checking revealed it to be a 6.8mm brass thread, 26 TPI. Should have checked I suppose, the 74 is a hodge podge of different sizes, different threads: The bike has metric threaded bolts, an imperial sized master cylinder, a couple of other imperial sized bits and all the other brass threads on the bike are metric. Only in Japan!
I've drilled out the threaded hole to 7.5mm and tomorrow I'll spin up a 6mm barb with a 7.63 shaft base and press it into place.
Sizing on the 74 is a bit of a hodge podge, mostly metric, as you'd expect, but also a few imperial sized bits, master cylinder bore, and clutch pushrod and ball to name a couple. There were a couple of other imperial size bits I found when I was rebuilding it.
