Topic: Which carb insulator goes where on a 400F? Halp!

[NobleHops]

Lads,

I have some aftermarket carb insulators to go on, and I see that there are two types, A and B. I do not know which is which as these are aftermarket with no Honda part numbers, but I see that one has a flattish spot on the 'neck' of it, while the others are round all the way around. Looks like one  pair goes on cyls 1 and 4 and the other pair goes on 2-3. Which goes to which, and in what orientation please?

...and while we're thinking about this, I am about to use antiseize on these new screws as the old ones were a bit of a bastard to get out, and cammed-out even having used the impact driver on them. Good or bad idea on the antiseize please too?

TIA,

Nils

(P.S. Yes, I searched)

[LesterPiglet]

Pictures would help.

[NobleHops]

Ahh, thanks Lester, I figured it out. For the sake of the next searcher, here's the skinny - will add photos later.

There are two types of carb insulators used on the 400F.

Insulator A is part number 16212-333-030  These go on cylinders 1 and 4 There is a depression of sorts on these, kind-of a flat spot that the B insulator does not have.

Insulator B is part number 16213-333-030 These go on cylinders 2 and 3

The reason for that is this: If you look at the intake on cylinders 1 and 4, they are pretty much straight through to the intake valve. The insulators for these are also formed straight through at their necks, closest to the cylinder head.

The intake ports for 2 and 3 are NOT straight - they slope toward the outer cylinders a bit. The last half-inch of the corresponding insulators have a bit of a shape to them, to align the passage better than a straight-through insulator would I suppose. Be certain to align these so the shape of the insulator matches that of the intake port.

Will add pics later.

N.