[Prowbar]

Here's a video of the dual exhaust rumble:



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Edit: regarding the 'knock' you hear, I believe it is piston slap, it goes away quickly when the engine warms up some. Also wired the heat riser open, however will try to tighten up the bimetal spring to get it to work properly. Otherwise it will be deleted.

Finally took apart and cleaned up the rocker arms. They had a layer of sludge in them. Luckily all the parts were in good shape, seems they got lubrication from somewhere. All the oil passages are clear now.

A top tip for someone running one of these for the first time is to clean these out first!