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not sure whats up but i am able to swap all three covers between engines it just seems the actual casting of the block is thicker. im no small chinese engine expert by any means i deal with full scale engines but i will eventualy get around to measuring up all 3 units

No same 2 bolt zen clone just like Cy but just as Cy is slightly different dimensions than zen hy is slightly different than both

Yes I tried swapping covers in between the block itself is thicker from what I can see but will measure to be sure

Cy and hy may look like the same animal but are both very different just as Cy and zen look the same but very different. I have a Cy and hy on my bench and have tried to drop an hy in place of a Cy and they are dimensionaly about 2 to 3mm different in width and motors mounts do not line up