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Whats eating my manifolds?

NOLAGuzzi

NOLAGuzzi

Cruisin' Guzzisti
Joined
Dec 5, 2008
Messages
102
This is a 04 breva with 16K miles. I apologize for the poor quality photo but its the best I can manage. The little shiny spots on the walls are pits. If I can figure out how to remove the manifold I can take a better photo. How does the hard rubber hose connecting the manifold and throttle body detach? Or would it be easier to remove the manifolds from the heads?
1246892002.jpg

I have serious pitting in both manifolds. I don't put additives, seafoam etc.., in my tank and I fill up with premium. I do live in a very humid climate and the bike is not garaged. Could this be the result of rain water getting in the tank? Or bad gas? I want to replace both and see if the problem continues.

Any advice on how to get these little buggers out would be appreciated.

Thanks.
 
Hi Mark, can't really tell from the photo, but could be a myriad of things doing it. If you go through the trouble of pulling them, I'd just use a little scotchbrite or fine grit sandpaper to clean them up. No use in replacing yet.

The manifold "boot" is pretty simple... once you get both hose clamps loose, push the plastic ends back into the air-box, and just push down and pull all at once. It's only friction holding it on one them on. nce you have them off, be sure to check for cracks. Replace if you see any.

Post again if you need to.
 
NOLAGuzzi wrote:
This is a 04 breva with 16K miles. I apologize for the poor quality photo but its the best I can manage. The little shiny spots on the walls are pits. If I can figure out how to remove the manifold I can take a better photo. How does the hard rubber hose connecting the manifold and throttle body detach? Or would it be easier to remove the manifolds from the heads?
1246892002.jpg

I have serious pitting in both manifolds. I don't put additives, seafoam etc.., in my tank and I fill up with premium. I do live in a very humid climate and the bike is not garaged. Could this be the result of rain water getting in the tank? Or bad gas? I want to replace both and see if the problem continues.

Any advice on how to get these little buggers out would be appreciated.

Thanks.
Click to expand...

I think you answered your own question, also if you keep it under a tarp or cover that is not breathable it is holding the moisture right were you don't want it and never giving it the chance to dry before the next cycle of temperature change. Ever consider powder coating them ?
 
THanks for the tip with the boot. I'll give it a try real soon. I'll get a better pic posted when the manifolds are out and also give the sandpaper a try.

I had not considered powdercoating, honestly I did not know that was an option.
So humidity and no garage eats my manifolds:angry:
but this is probably not a big deal B)
 
If you take them off and clean them then you can just spray paint them with a high temperature engine paint.

The pitting may be caused by electrolysis. Dissimilar metals can react.

A couple of things to do:

As already suggested put a cover over the bike to keep it dry a bit.

Use some lanolin grease on the retaining bolts when you put them back in. This prevents current flow.

Check for a voltage leak in the electrics. This may be increasing the corrosion.

Just some more options and they may or may not be applicable.
 
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