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stpauls

Exhaust Bung Issue?

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I have just replaced the clutch side crank shaft seal on a Sherco 2T.  I have always used an exhaust bung when I wash my bike.  I was wondering if running the engine with an exhaust bung still inserted into the end of the tail pipe would explain the damaged crank shaft seal?

 

s-l225.jpg

         Exhaust bung

Edited by stpauls

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Done it myself a couple of timed by accident. I now use the champagne cork from my previous weekend victory celebrations, this acts as a pressure relief valve, when the exhaust pressure builds the cork pops across the garage forecourt. Apart from a few strangers with a black eyes, no harm done.

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That's quite an exhaust leak if you can start your Sherco and run it with a bung in? Anne Summers do some very good butt-plugs that would do a much better job....err...I'm told :blush:

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I've left the bung in by mistake and started it up.Ran badly for a little while and fired the bung into the rose bushes.Scratched my hands retrieving it and learnt a lesson,more careful now

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It certainly won't help, the pressure has to escape somewhere. Why would you do that ?

I always warm the engine up after washing the mud off.  I have close neighbours and the bung reduces the volume a lot.  I bet this is what caused the crank shaft seal to fail.

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Fair comment, I use a compressor to blow most of the water off, they spray with a moisture displacer. 

 

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Given the pressures the crank seals are designed to hold at full chat I would expect the bung to be forced out before the seals would fail.

Just hold a bit rag lightly over the exhaust if you want to quieten it for the neighbours while running for a short period.

Edited by 2stroke4stroke

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