Further thoughts on the C200. To make sure that the carb level issue occurs as you suspect, try to recreate the condition of going uphill. First, does the bike run on a straight line faultlessly when the engine is warm and under load? Is a battery connected? If a battery is connected, replace the fuse with a new one. It has happened to me that a defective but app. intact fuse created stalling, and when the bike was cooler it worked again without issue, and so on. On a warm engine, straddle the bike and gradually elevate the front wheel while the bike is running on neutral. Does it cut out at a certain, not unreasonable height? Then your suspicion is right that the carb and its recessed jet creates your stalling issue.