How do you replace a kick start shaft on a Honda CT90?

To replace the kickstart shaft on a CT90 the entire engine must be disassembled and crankcase split in order to gain access to it, it can be a difficult job and will require some mechanical knowledge and a manual. it is quite expensive as all gaskets have to be replaced and the whole engine has to be reassembled after wards. so unless you are after a perfect rebuild or are going to be performing some bottom end or gearbox work on the engine it is not really worth it unless you willing to pay the cost. otherwise you can just simply roll start it.