mikevillena

Hi folks. I spent several days using the search function but can't seem to find useful info. What's the best way to remove both the primary and secondary venturi from the Nikki carb without damaging them? Thanks.

Benjamin4456

My method is to find a socket just a hair smaller than the diameter of each bore and tap them out that way - at this point I have sockets designated for the purpose. Other folks use large washers with a bolt attached, etc. Really just whatever you have available. Even a seal driver may work if you can find one the right size.

Trick is to spray the venturis with some canned air, butane, or other cold liquid before removing them. That way they contract a little from the main body and are easier to remove. It's not mandatory, but it helps.

Also be sure to only tap on the top side of the venturis. The bottom is thin and comparatively weak. This means tap them out the bottom, install through the top.

Hope that helps.

mikevillena

Ah, thank you Benjamin4456. To be honest, my head is spinning after having tried my level best to read and comprehend what must be a hundred posts about Nikki carb mods. I vaguely recalled someone using canned "duster" but I could not find the post to verify. For those that are contemplating doing the same thing, the primary venturi are shaped so that the interference fit (30.0 mm outside diameter) is only 18 mm long measured from the top (inlet side). I would imagine that tapping it from the bottom (29.4 mm outside diameter) would cause the metal to flare out as it was being driven out of the carb body causing continued interference and/or permanently deforming the relatively soft (pot metal?) venturi itself.