TOPIC:

I suspect my mixture problems may be the result of a slight leak at the inlet manifold. The parts manual only shows the inlet manifold assembly - parts no 328686. No separate O ring listed. Does anyone know the size and/or a source for a replacement or, fingers crossed, a brand new inlet sub (rocking horse poo???)

we are talking about the surface of the rubber bolted to the cylinde rhead?
I suppose there is no O-ring.
It looks like there is a groove with a ring in.
Also on the Nordi part it looks like this.
But you can not remove that 'ring'
It's only a hump molded in the form with which Luigi made the rubber part
So maybe an extra paper gasket, or some silicone sealing will do the job

ciao Joachim

As Joachim said, it looks like theres 2 flat o rings but its the rubber from the bonding, I used a small smear of silicone gasket on assembly or hylomar, as J said, you could make a paper gasket easy eonough too.

as an aside, there are new inlet manifolds out there, but they have gone back to be drilled, heaven knows why ? I could drill one easily enough for the mounting bolts, so hopefully they will appear here soon.

stop... this one here is for a Saturno
The new ones from Luca are for Nordies

ciao Joachim