stpauls Posted January 31, 2016 Report Share Posted January 31, 2016 (edited) 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? Exhaust bung Edited April 12, 2016 by stpauls Quote Link to comment Share on other sites More sharing options...
b40rt Posted January 31, 2016 Report Share Posted January 31, 2016 It certainly won't help, the pressure has to escape somewhere. Why would you do that ? 1 Quote Link to comment Share on other sites More sharing options...
sirdabalot Posted January 31, 2016 Report Share Posted January 31, 2016 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. 1 Quote Link to comment Share on other sites More sharing options...
craigrushton Posted January 31, 2016 Report Share Posted January 31, 2016 As oni says above, my 315 wont start if i've left the exhaust bung in ? As done it a few times ! Quote Link to comment Share on other sites More sharing options...
ham2 Posted January 31, 2016 Report Share Posted January 31, 2016 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 1 Quote Link to comment Share on other sites More sharing options...
huski Posted January 31, 2016 Report Share Posted January 31, 2016 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 Quote Link to comment Share on other sites More sharing options...
stpauls Posted January 31, 2016 Author Report Share Posted January 31, 2016 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. Quote Link to comment Share on other sites More sharing options...
b40rt Posted January 31, 2016 Report Share Posted January 31, 2016 Fair comment, I use a compressor to blow most of the water off, they spray with a moisture displacer. 1 Quote Link to comment Share on other sites More sharing options...
the addict Posted January 31, 2016 Report Share Posted January 31, 2016 I'm staggered you got it to start with it in? 1 Quote Link to comment Share on other sites More sharing options...
2stroke4stroke Posted January 31, 2016 Report Share Posted January 31, 2016 (edited) 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 January 31, 2016 by 2stroke4stroke Quote Link to comment Share on other sites More sharing options...
s.e.lucas Posted February 1, 2016 Report Share Posted February 1, 2016 Do you hammer it in or something? Quote Link to comment Share on other sites More sharing options...
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