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Black Goo


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You need to re pack your silencer. Cleaning the centre section will help but the goo you notice runs back down form the silencer and not as much up from the centre section.

By a big bag of packing material for a couple of quid and change it once. Ride the bike fast on trails for and hour or so (use 50-60:1) and then this helps burn the header and centre section off.

Once cooled change your silencer packing again.

Not a proper job such as using spuds and caustic soda but it'll help.

The black goo is just old un burnt oil in the petrol mix that has migrated through the pipe and not been burnt off through hotter exhaust temps.

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Wash out the old oil first.

Before repacking slosh some petrol inside the removed pipes. stand it on end to drain and leave over night so the petrol can evaporate.

WARNING risk of explosion....... so let it evaporate and then REPLACE the packing material.

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Remove the the outlet end there is two screws holding the black end on

This will remove the baffle tube.It can be tight to get out but watch the box is very thin Remove any packing left inside and repack Just done mine and there was very little inside to remove It may take a trial or two to settle but it will change the peformance of the engine.

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The packing is like a sponge but through capillary action not pore spaces . It absorbs lots of oil over time and becomes saturated. It then drips out hence it does it when the packing needs a change. Leave it longer and the soaked packing breaks up and then it gets noisy.

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