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Those have the 29cc Km head and piston on the KM bottom end. They will work just fine until you want an upgrade. A DDM pipe and it will feel even stronger.
Upgrading any motor is costly. Its just a bit cheaper with a CY or Zen because you can reuse the Bottom end. Some people never just change out a head kit and buy the whole motor anyhow. Depending on the deal that is going on it may be the cheaper alternative.
Upgrading any motor is costly. Its just a bit cheaper with a CY or Zen because you can reuse the Bottom end. Some people never just change out a head kit and buy the whole motor anyhow. Depending on the deal that is going on it may be the cheaper alternative.