looking for rebuild z50 k5 engine rebuild kit..

[05cummins432]

looks as if the mini bike bug has bitten. I'm beginning to restore a Honda z50k5 and was looking for a engine rebuild kit. last time i it ran was probably 10yrs or go better. it still cranks and everything so it not locked up. but as far as i can remember last time it ran it smoked like crazy and would cover the rear fender in oil. i know i should probably rebuild the carb just for safe measure since its been sitting for so long. but if someone could steer me in the right direction of how extensive of a rebuild i should do would be great. maybe just a top end or just go through it front to back? any help would be great! thanks