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Message: [QUOTE="Micahdawg, post: 887020, member: 21668"] OK, I had a BR8ES in the bike with old gas. This weekend I swapped toa BR9EG with fresh 93 octane, Klotz premix and 32:1 ratio. The knock sounded worse. I'm starting to wonder if it's not piston slap. I've also got the worlds wierdest idle surge. Sometimes it's really solid, other times it really irradic. For instance, I was riding the bike hard through the mud, it was very hot and the idle was chopping like it was running out of gas? As for those of you wondering why I would cheap out on the rod............The only thing worse than having $1400 in a 1989 KX is having $2400 in a 1989 KX.and it still not running right. At the time of the engine rebuild, I wasn't sure the bike would even turn out ridable. It was a salvage bike that I saved from the junk yard. Micah [/QUOTE]