SOHC.co.uk Forums > CB350/400

silencer repair/refurbish

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billywingnut:
My bike is fitted with an original exhaust system the chrome is very good. However I have noticed a small hole underneath water comes out during idling. Does anybody know if there are any companies out there  that can refurbish these silencers as they are as rare as rocking horse droppings.
When I removed it to check it out  a handful of rust came out which is a shame as it's pretty solid and  sounds good not loud.

Johnwebley:
I think the four pipes all have drainage holes.

What bike is it?

Sent from my SM-A750FN using Tapatalk

Nurse Julie:
If its your 400/4 pipes, they don't have a drain hole in them, so its not a standard hole. It's a shame when these old pipes rot from inside out, you don't know anything about it until it happens unfortunately. Is it the silencer that the hole has developed in or the collector box.

billywingnut:
The hole is in the silencer a couple of inches from where it enters the splitter box, there doesn't appear to be any blowing from it when engine is running.

Nurse Julie:

--- Quote from: billywingnut on May 02, 2020, 09:11:45 PM ---The hole is in the silencer a couple of inches from where it enters the splitter box, there doesn't appear to be any blowing from it when engine is running.

--- End quote ---
Maybe the baffle is welded at that point stopping anything blowing out of the hole 🤔 I suppose it's something us 400/4 owners will all face at some stage. I gave my silencer, a Brituro, a good shake about 4 years ago and no rust came out then and I do tend to run my bikes very slightly on the rich side which helps with a bit of rust prevention. What do you plan doing with it?

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