i decided id change back to the original carbs for a test.
the new carbs had a piss poor bottom end, but a really good top end,
so i chuck on the carbs, starts first kick as always,
take off and the bottom end feels great, but i get to the top end and it feels pretty crap, couldnt get above 55mph
and way coming back up the hill to my place and a cylinder drops out and starts running on one,
i thought it was the condesor arcing out on the cover (its happened before) but it felt considerably free'r revving,
parked it up and let it cool down before looking at it.
first thing i did was pull the plug, it had crap built up on it..... oh... nooo.....
put my finger on the plug hole and pushed down the kick start.....
noooooooo!!!!! compression = 0
pulled off the head to be greated with this tale of woe
luckily in my arsenal of spares i had one piston that was in good shape, with 1 good ring,
exactly what was needed
so swapped it all over and happy days
most importantly my stupidly expensive ceramic coated barrels were still in perfect nick, not even a hint of a scratch (thank Hesus)
heres a couple more pics of the semi destruction
so one can assume that the main jet on the left cylinder is blocked, and it was just running on the pilot jet the whole time, much leanness = very hot
very hot = burny hole to piston
burny hole to piston = sadness
so therefore much leanness = sadness,
better to be a bit fat