Quote:
Originally Posted by (F5)
1.2mm or 1.3mm is still heaps. I'm going to pull my 300 down to 1mm. These things don't rev high. My 200 on the dyno was all over at 9300 & over rev barely touched 10, normally you wouldn't pull that high. The bigger bikes probably don't go past high 8s, maybe 9.
I'll then pull out some metal from the chamber to reduce the compression back down to it's std 12.5:1 which is easy enough to kickstart & suit our 95 gas. My 200 I had raised to 13:5:1 (at squish 1.1 but that was where it ended up).
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Everything I've read about yz250's suggests that the ideal squish height is between 1.14 mm to 1.27 mm. I'd imagine it would be close to the same for an EC250. What dangers or problems could you see arising from going tighter? and when is tight too tight? I'll be having the head work performed elsewhere so will be liaising with them. I feel that 1.2mm and 12.5CR would be a nice safe option. I sometimes find myself in remote areas where crap fuel is present, even if its only 1/2 a tank. I don't want to sacrifice any reliability in the name of power either.
I've also got the tacho hooked up on my 300 and while I think it would be fair to say the power would be signing off by 9000rpm it will stretch its legs to 9800rpm when asked to.