Rattle and hum....

[Storkfoot]

.......when you're flying along on a nice day and you hear a noise that could well be pinking, don't tell yourself that it couldn't possibly be pinking, it must be a rattle from somewhere. Otherwise, within a few minutes you'll hear a "pop" and you'll be grabbing the clutch............

[Wack]

Oh dear, air leak on head the cause?

[steveg]

Not good Paul

[Storkfoot]

The head was leaking into the studs but not right out which is why I didn't spot it. Looking at the cylinder head in the photo, it looks to me like it has been like this for a while.

Also, I run with a RamAir filter straight on to the plastic bellmouth of the PHBH and out through a hole in the panel. The bellmouth had vibrated loose (threads knackered) with the Ram Air still attached. Whilst it hadn't actually fallen off, I suspect it was drawing in more air than normal.

This is actually the first holed piston I have ever had (I've had plenty of seizures on cast iron barrels ) so mustn't grumble. Bits of aluminium get everywhere, crank, reeds, bearings, seals.

I'm planning on flushing out the bearings and replacing the seals. Is that reasonable?

[Storkfoot]

Not good Paul

Aye, mate, just when you could do without the expense too. It was on the way from Llangollen towards Chester after a very pleasant weekend