Performance differences TM KZ K9, K10, R1, R2

Does anybody know what improvements has been made to the different engine models throughout time?
Is the new KZ engines from TM remarkably quicker, compared to the older models?

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It’s hard to say because it really depends on the state of tune too.

I had a K9A that was supposedly a “factory” motor with a special crank. At the time it was faster than the KZ10’s the other guys had. It was definitely fast.

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From my experience as I’ve tried k9b, kz10b and now owns a kz10c. The 10C has a lot of top end, it wants to rev but still very manageable in the mid rpms.

The k9b was very all or nothing, you had to keep it in the high rpms. And the 10b was a pretty complete package overall.

The R1 is super everywhere pretty much, easy to setup. But compared to the 10c at the higher rpms the 10c is better. But if I had the money I would buy an R1😆

But with all that said, in my last race I had no problems at all to fight for a podium in a field with only R1s and Iame screamer 3

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1 somewhat minor but significant mechanical change from the 9 to 10 series was the crank bearing grew from 20mm to 22mm.

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