i have a 2005 blaster never had a problem with it its all stock besides an airfilter i change the oil often and take pretty good care of it but lately when i ride it, doesnt shift into second... sometimes it does and some times it just wont click up and i noticed going in too fifth was kind of hard last time i rode it but since this is happening i totally stopped riding it till i figure out whats wrong with it so any suggestions would be nice thanks