I have seen motorcycles in Uralsk, but I think only once, when there were a whole load of them. Also saw a very old machine while running off-road. The months where you would use it are probably few as you will be on holiday for a lengthy period in the summer, unless you intend touring Kazakhstan. I would imagine that it is possible to be a biker in Kazakhstan but do not expect it to be easy. Everything is a little more difficult than it should be and requires patience and you may need to call on local friends for help. As for fishing, people do fish - this is most evident during the winter months when the fishermen cut a hole in the ice. I think it is mainly carp and the like rather than what we would refer to in the UK as game fish (trout, charr and salmon). As with everything, you need to network. I am sure that you will form some very special relationships with some Kazakhs who will do everything they can to help.
Hi. See you in August. Motorcycles are available in Uralsk although I'm not sure on how safe they would be. Locals are hit and miss with wearing protection ie helmets etc, and the bikes themselves may not be from reputable manufacturers. I don't know how foreigners would go about getting a bike, ie the licence needed. As for fishing, carp are pulled out of the river all the time. The river(s) loop the town and are quickly accessible from virtually everywhere.
Kazakhstan is offering many jobs to qualified international teachers right now. As part of a programme to develop the education of the country, the roles combine teaching students and mentoring local teachers using English as the language of learning.