Carburetors: VC42 vs VHA

[Pancho]

Hi all, Its had me thinking why is my VHA different to every other one I have seen. Its still got me think, but besides where the power valve goes through the top of the bowl, on my VHA there is another type thingy next to it, Attached are some photos of what it looks like, does anyone know why its got this on it ?

Cheers G60mike

It is a "High Speed Enricher" mechanism as you can see here:

High speed enricher3 (Small).jpg

[G60michael]

thanks Pancho, you are very very helpful, i need you to WEB diagnose my old 78 its playing up

[Keith]

Good to know. I already have a kit or two for the VC42 but could use a couple for the VHA. Thanks!

Kit numbers are

HT409 - Hitachi VC42 61- 1/69
HT410 - Hitachi VHA 2/69- 80

Correct me if I am wrong, but that's what fuel miser book said

I'm confused. My 69 has a VC42a & its production date is 6-69.

[G60michael]

Good to know. I already have a kit or two for the VC42 but could use a couple for the VHA. Thanks!

Kit numbers are

HT409 - Hitachi VC42 61- 1/69
HT410 - Hitachi VHA 2/69- 80

Correct me if I am wrong, but that's what fuel miser book said

I'm confused. My 69 has a VC42a & its production date is 6-69.

Keith, by the sounds of things your carby has been changed and someone's bolted the VC42 to the manifold, a aussie patroller over here, recently purchased a 76 model with a VC42 on it, definitely been swapped.

[RiverPatrol]

Kit numbers are

HT409 - Hitachi VC42 61- 1/69
HT410 - Hitachi VHA 2/69- 80

Correct me if I am wrong, but that's what fuel miser book said

I'm confused. My 69 has a VC42a & its production date is 6-69.

None of the US Patrols came with the VHA carb.

[Esteban]

A couple of days ago I was looking at the repair kit for the VC42 carb that I have, even though I'm not using it at the moment. Pancho mentioned to me that the air/fuel mixture screw in a kit he used a few weeks ago, was with the incorrect pitch, so he didn't use it.

I took this picture that shows a new air/fuel mixture screw, next to an old original one. Same thing, the screw is incorrect. Pitch is 0.5mm for the original, and 0.75mm for the one in the kit. To the few out there that have this carburetor, please be aware that you might have the incorrect one. Michael, please check your kit and comment about this. The manufacturer of yours might be a different one.

Carburetor Air-fuel mixture screw VC42.jpg

As a side comment, I have kept this kit along with parts from previous kits, for over 15 years maybe.