I have a new Yamaha motorbike. Seller told me not to ride speed more than 50 Kmph for first 1000KM but I rode it 60 for 10 - 15 minutes due to some reason. How does it affect to my Motorbike ?.
Breaking in the engine correctly will greatly affect the longevity and performance of the bike, plus you have warranty regards to worry about as well. I found this from a Yamaha forum and seems along the lines of what I understood to be right:
For best results, you can (at least here in the US) have the motorcycle dealer do the break-in for you. By doing so, you never have to worry about the boring part of owning your bike, that being the break-in period. As well, you know the warranty will be covered without issue.
I cannot tell you if your riding at 60kph for a period of time has done any damage. My gut check would tell me no, but you never know.
There's usually two methods people discuss. The 1st method is the one Paulster2 described, which is by the manufacturers suggestion in the manual. The 2nd is a more controversial method of running it hard.
Here's a snippet from [MotoMan]:
I'm not going to recommend which is right, but I'll provide a few more links of the 2nd method so you can read and make your own decision.