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Message: [QUOTE="jescombe, post: 324375, member: 28670"] The thought has crossed my mind, not ready to quit on it just yet though! :confused: Just come back from a quick dyno session, good news is the bikes still putting out decent power (53hp with the standard cams & pipe). I was running a thermocouple in the coolant pipe from the head, and the coolant temp only reached ~80deg C before it started overflowing. So it looks like it's pressurised and not overheating & boiling over?? Also ran a leak-down test, which came out at 12% (has previously varied between 4% at best, and 20% with a stuck compression ring). It's definately leaking past the inlet valves (one in particular), so it looks like I've got a few jobs to do when I pull the head this week.. Cheers, Jon E. [/QUOTE]