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I'll do some research when I have a minute. I wish the OHC 223 I have was a true 169FMM (230cc) like the tag rather than the 223cc (crf230F clone) that it is. I found a few upgrade size cylinders for the true 69mm bore version. :(
That said, these OHV pushrod 167FMM motors don't have too many options. The big bore kits they used to sell are no long available from any of the distributors I've contacted. Oh well, I'm just having fun tinkering.
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