Are these the sleeved ones? Or the ball joint looking rounded seal? I have the
latter on my classic, and eliminated all my leaks by using genuine Honda
motorcycle
copper exhaust gaskets.
Cheers,
PeteZ
> On Jan 5, 2024, at 11:18AM, n7188u <chmgarb@gmail.com> wrote:
>
>
> Hello Europa Family,
>
> First of all Happy New Year together with hopes of a great year 2024! I also
hope you had enjoyable holidays (I did have a very special one, which included
a Europa related activity, and I will an expand on a following posting).
>
> The reason for my posting today is that Ive been having a slight exhaust leak
through the #4 cylinder head joint to the manifold. I had this leak on my old
engine and again on my new one so I can safely assume it is related to either
pipe alignment or warped mating surface at the pipe. My other three pipes are
not leaking. So far I have realigned the pipe multiple time to try to improve
the seating of the manifold on the head with no success. I am afraid that if
it continues like this it will eventually damage the head sealing surface.
>
> I am sure that if CKT was still around I could talk to them and solve this
> issue
(I should have done that earlier) but so its life. Anyone in the forum had
this issue and resolved it hopefully without requiring new parts?
>
> What occurs to me as possible solutions:
>
> 1.- Check if the mating surface in the joint is not warped (no idea yet how)
and correct it (also no idea how).
> 2.- If the joint is not bad, lap the joint.
> 3.- Use an exhaust system sealant. Heide at CKT once recommended Hylomar EAP5
for the slight leak at the slip joint in the #1 cylinder pipe. I would think
this could help but only short term as this joint probably moves a little.
> 4.- I read in the Rotax-Owner forum that CKT would sometimes recommend a
> sleeve
to be placed in the joint (I think this is for a seriously worn cylinder mating
surface). It would be nice if some sort of soft gasket existed for this joint.
>
> I will check on the Rotax maintenance documentation but does anyone know what
the specification is for the cylinder head exhaust port joint mating surface.
I would think that the exhaust one should be slightly spherical to allow some
misalignment. A lapping tool could be created to rectify the surface on the
pipe but that could get expensive (I wish I still had my machine shop).
>
> Anyway, I will await for our valued opinions on this subject.
>
> Chris
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=513018#513018
>
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