Hey guys, i have an RVF400 just wanted to ask what oil is better to use for it, Motul 5100 or 7100. A few people have said use 7100 but some says its to thin and will make my engine ping so its better to use the 5100. whats the difference in the oils? and also how often should i change my chain? its getting to the stage now that when i tighten it after a few weeks, it needs to be re tightened. is that normal? if i change the chain do i have to change both sprockets also? any input would be great thanks.