I've got a yamaha R125 YZF (as my first bike so no very little about them) I've done just under 2000 miles on it but was ridding them other day and was told i had whats called a "high speed seize". At the time it had a non standard exaust on it, the air box had also been changed if i get the STANDARD parts refitted do you think yamaha will fix it for free?
**Also i have lost my service book.