The pipe to the right cylinder / radiator came out from the barrel, and of course it dumped the coolant without me realizing. I felt the engine loosing a little power, but thought it was plugs fouling since I know it's running rich.

It got so hot on the upper cylinder, that the rubber coolant hose has melted where it fits over the pipe!

What I want - NEED - to know, is why that pipe came out? I pushed it back in again easily, but now the motor is cool I can't shift it. I did half a track day at Llandow and it was fine, and I'd already done 60 miles when it happened, so I'm a bit lost and rather concerned.

I did have that barrel replated recently, so the pipe has been out, but as far as I know they're just a press fit and tighten up when the engine warms.

Does anyone actually glue these things in?

And Stephen, thanks for the offer, but I'm not sure how else to get the bits out of the crankcase. Maybe I can just drop the engine and flush it out with petrol?

I'm gonna need a piston, rings, gudgeon pin and circlips, replate, and gaskets at the very least. I'm hoping nothing else has been damaged by the portion of piston skirt.

Another £200, but having just taxed and Insured it, itd be a shame to stick it in the shed now!
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