Quote:
Originally Posted by GMP
Compression test pressure is measured by kicking the bike fast with the throttle open until the reading tops out and stops rising. A good 250 will be around 185 - 200, 300s a bit less, more like 175 - 185. You have to kick fast enough to make normal leakage through the rings and in the case of the 300 the bleed hole not a factor. Compression ratio is the volume of the cylinder from the top of the exhaust port plus the volume of the head divided by the volume of the head. No way 14:1, usually around 7-8:1.
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So if its 8:1 and atmospheric pressure is 14 psi, how do you get 185 psi? I am not saying you don't, just wonder how. Like I said, my gauge may be off, but I am getting 125 in both my bikes and 90 in my boat (which is what the shop had marked on the heads also). I know in multi cylinder motors they say if the pressures are all close you should be OK
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2006 EC300, 2000 XR650R, 2003 EC250, 2001 EC200 (OK, the last two are really my sons).
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