First a 61mm cylinder will require the case to be bored. There are some kits out there claiming that they are drop in. Do not buy. On those kits they turn down the cylinder sleeve which makes it too thin and does not last long for the sleeve cracks. Stick with the 58.5 kit which is a true drop in cylinder. If the pin can be removed from the piston with ease the crank should be good. If the pin is difficult to remove like having to use a punch to knock it out than check the rod for any scoring. That engine with internal reverse uses a different crank than the common GY6 so they won't work.
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