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Sounds like you blew the rings or cracked the head. I'd probably lean toward that second one, as it would be odd to just blow one set of rings so severly that it immediately damages performance without any other misfires, but it's possible. If it leaned out too much, you also could have damaged a piston. I'd say the best bet is to pop off the head and take a look around. I've heard of cracked heads on the L67, and unfortunately you're most likely going to have to replace it.
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