SOHC.co.uk Forums > CB500/550

Exhaust pipes

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florence:
Please can anyone tell me, will CB650 exhaust down-pipes fit onto a CB500 four?  My exhaust is falling apart, the MOT is due fairly soon and I need to find a very cheap way of repairing it.(the gun-gum only lasts for so long! and the holes are getting bigger)  

I have noticed there are some CB650 down-pipes on ebay but I don't want to buy them if they can't fit.

The down-pipes on these bikes are a real mud-trap, the bikes on it's third set now.  I think I should put a rubber flap at the bottom of the front mudguard.

Bryanj:
There was some talking about this on the US site and i think the end opinion was no as the exit angles are different, but i didnt linkit and cant be 100%

florence:
ahh, sorry don't often go to the US site anymore.  I will have a look.

Spitfire:
When I bought my CB750 F1 new one of the first things that I did was to fit a mudflap to the front mudguard to save the downpipes. Unfortunately this did not work as 28 years later the pipes did rot, not where the crap from the front wheel went but on the welded joints, oh and the front mudguard under the flap rusted, this again too about 28 years to become an issue !

Cheers

Den

matthewmosse:
Rubber flap behind mudgaurd is deffinately a good idea, it helps a fair bit. depending on how bad the corrosion is welding can outlast gun gum, re making a collector box area isn't totally beyond home fabricators. Even easyer if you have a supplier of thinwall pipe - most exhaust suppliers apparently can sell you some if nothing suitable is forthcomming from their skip.

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