My xt350 yamaha did this to me for years and progressively got worse. It would start and idle and drive just fine but when I went to climb a hill it would bog really bad to the point I couldnt climb any big hills. I thought it was a dirty carb so when I took it off to clean it I discovered the boot that goes between the carb and motor had started to come apart and was letting air get by the carb under power. I changed the boot and it hasnt done the bogging on hills since.
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