Topic: Any reason a '77 400F Petcock wouldn't work on a '75 400F Tank?

[veloracermike]

Different part numbers but the blow up looks like it's the same petcock.  30 buck difference between the two.

[Bodi]

I'm not sure of the relevant years but there were two different tank bung sizes and two corresponding petcocks: one size will not fit on the other. I think from 75 to 77 the size would definitely have changed. I have both types, but I don't know their years. I'm pretty sure the 76 has the larger bung and the smaller bung type looks simpler and cheaper so I'll guess it was a 77 thing - maybe changed when they went to the lid tank from the filler flap type.

[Tim2005]

yes. the filler flap 77 tank has a completely different tap and they won't swap over.

[veloracermike]

yes. the filler flap 77 tank has a completely different tap and they won't swap over.

Thanks.