Yamaha motorcycles are well refueled in cold weather and well refueled in warm weather.

The damper is getting better and better, and it is normal when the weather is warm, which is caused by the low temperature of mixed gas and poor atomization. If it is normal only when the cold car is just starting, then warm it up for a while before you go. If it is the same when the car is hot, check whether the mixture ratio of carburetor is too lean.