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[QUOTE="leonard1, post: 1295870, member: 83383"]
I have done a fair bit of experimenting since my last post and have found some interesting results.  Firstly a reminder that the first thing I did was to take .7 mm off the head, which took my squish band down to 1.1 mm.  This  produced some huge bottom end and mid range gains but at the expense of a little top end and then there was the strange pinging noises at high revs.  Even after a fair bit of riding their was no visable damage to piston , head or plug so strange.  I took the head back and had 0.9 cc taken out of the dome part of the head.  This has almost eliminated the pinging but has now lost some power down low and created a flat spot just before the power valve opens and hits hard into the power band.  This really doesn't suit me.  It does appear now that the head mods have upset the way the combustion happens and might be time to start with a new head.  Next time I think I might take less off the head in the first place, maybe .3 or .4 mm.  Any thoughts?
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